Skip to content

M
MariaDB
Commit dff98a8e authored by sergefp@mysql.com's avatar sergefp@mysql.com
Browse files
Options

* New index_merge EXPLAIN output format 

 * Fixed a problem with wrong query results for partially covering keys in ROR-index_merge
 * ROR-intersection retrieval plan choice algorithm now uses less disk IO
   - and properly processes clustered PK range scans 
 * Fixed several minor range optimizer problems
 * Added more comments
 * Code cleanup
parent 8b4ea833
Hide whitespace changes
Inline Side-by-side
Showing with 1144 additions and 485 deletions
mysql-test/r/index_merge.result
View file @ dff98a8e
......@@ -21,7 +21,7 @@ id select_type table type possible_keys key key_len ref rows Extra
explain
select * from t0 where key1 < 3 or key2 > 1020;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 31 Using where
1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 31 Using sort_union(i1,i2); Using where
select * from t0 where key1 < 3 or key2 > 1020;
key1 key2 key3 key4 key5 key6 key7 key8
1 1 1 1 1 1 1 1023
......@@ -32,11 +32,11 @@ key1 key2 key3 key4 key5 key6 key7 key8
1024 1024 1024 1024 1024 1024 1024 0
explain select * from t0 where key1 < 3 or key2 <4;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 7 Using where
1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 7 Using sort_union(i1,i2); Using where
explain
select * from t0 where (key1 > 30 and key1<35) or (key2 >32 and key2 < 40);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 9 Using where
1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 9 Using sort_union(i1,i2); Using where
select * from t0 where (key1 > 30 and key1<35) or (key2 >32 and key2 < 40);
key1 key2 key3 key4 key5 key6 key7 key8
31 31 31 31 31 31 31 993
......@@ -56,18 +56,18 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 ref i1,i2,i3 i3 4 const 1 Using where
explain select * from t0 use index (i1,i2) where (key1 < 3 or key2 <4) and key3 = 50;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 7 Using where
1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 7 Using sort_union(i1,i2); Using where
explain select * from t0 where (key1 > 1 or key2 > 2);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 ALL i1,i2 NULL NULL NULL 1024 Using where
explain select * from t0 force index (i1,i2) where (key1 > 1 or key2 > 2);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 1024 Using where
1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 1024 Using sort_union(i1,i2); Using where
explain
select * from t0 where key1<3 or key2<3 or (key1>5 and key1<8) or
(key1>10 and key1<12) or (key2>100 and key2<110);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 17 Using where
1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 17 Using sort_union(i1,i2); Using where
explain select * from t0 where key2 = 45 or key1 <=> null;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 range i1,i2 i2 4 NULL 1 Using where
......@@ -79,26 +79,26 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 range i1,i2 i2 4 NULL 1 Using where
explain select * from t0 where key2=10 or key3=3 or key4 <=> null;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 index_merge i2,i3,i4 i2,i3 4,4 NULL 2 Using where
1 SIMPLE t0 index_merge i2,i3,i4 i2,i3 4,4 NULL 2 Using union(i2,i3); Using where
explain select * from t0 where key2=10 or key3=3 or key4 is null;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 index_merge i2,i3,i4 i2,i3 4,4 NULL 2 Using where
1 SIMPLE t0 index_merge i2,i3,i4 i2,i3 4,4 NULL 2 Using union(i2,i3); Using where
explain select key1 from t0 where (key1 <=> null) or (key2 < 5) or
(key3=10) or (key4 <=> null);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 index_merge i1,i2,i3,i4 i2,i3 4,4 NULL 6 Using where
1 SIMPLE t0 index_merge i1,i2,i3,i4 i2,i3 4,4 NULL 6 Using sort_union(i2,i3); Using where
explain select key1 from t0 where (key1 <=> null) or (key1 < 5) or
(key3=10) or (key4 <=> null);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 index_merge i1,i3,i4 i1,i3 4,4 NULL 5 Using where
1 SIMPLE t0 index_merge i1,i3,i4 i1,i3 4,4 NULL 5 Using sort_union(i1,i3); Using where
explain select * from t0 where
(key1 < 3 or key2 < 3) and (key3 < 4 or key4 < 4) and (key5 < 5 or key6 < 5);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 index_merge i1,i2,i3,i4,i5,i6 i1,i2 4,4 NULL 6 Using where
1 SIMPLE t0 index_merge i1,i2,i3,i4,i5,i6 i1,i2 4,4 NULL 6 Using sort_union(i1,i2); Using where
explain
select * from t0 where (key1 < 3 or key2 < 6) and (key1 < 7 or key3 < 4);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 index_merge i1,i2,i3 i1,i2 4,4 NULL 9 Using where
1 SIMPLE t0 index_merge i1,i2,i3 i1,i2 4,4 NULL 9 Using sort_union(i1,i2); Using where
select * from t0 where (key1 < 3 or key2 < 6) and (key1 < 7 or key3 < 4);
key1 key2 key3 key4 key5 key6 key7 key8
1 1 1 1 1 1 1 1023
......@@ -109,7 +109,7 @@ key1 key2 key3 key4 key5 key6 key7 key8
explain select * from t0 where
(key1 < 3 or key2 < 3) and (key3 < 4 or key4 < 4) and (key5 < 2 or key6 < 2);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 index_merge i1,i2,i3,i4,i5,i6 i1,i2 4,4 NULL 6 Using where
1 SIMPLE t0 index_merge i1,i2,i3,i4,i5,i6 i1,i2 4,4 NULL 6 Using sort_union(i1,i2); Using where
explain select * from t0 where
(key1 < 3 or key2 < 3) and (key3 < 100);
id select_type table type possible_keys key key_len ref rows Extra
......@@ -129,7 +129,7 @@ explain select * from t0 where
or
key1 < 7;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 index_merge i1,i2,i3 i1,i2 4,4 NULL 10 Using where
1 SIMPLE t0 index_merge i1,i2,i3 i1,i2 4,4 NULL 10 Using sort_union(i1,i2); Using where
select * from t0 where
((key1 < 4 or key2 < 4) and (key2 <5 or key3 < 4))
or
......@@ -146,25 +146,25 @@ explain select * from t0 where
or
((key5 < 5 or key6 < 6) and (key7 <7 or key8 < 4));
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 index_merge i1,i2,i3,i5,i6,i7,i8 i1,i2,i5,i6 4,4,4,4 NULL 19 Using where
1 SIMPLE t0 index_merge i1,i2,i3,i5,i6,i7,i8 i1,i2,i5,i6 4,4,4,4 NULL 19 Using sort_union(i1,i2,i5,i6); Using where
explain select * from t0 where
((key3 <5 or key5 < 4) and (key1 < 4 or key2 < 4))
or
((key7 <7 or key8 < 4) and (key5 < 5 or key6 < 6));
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 index_merge i1,i2,i3,i5,i6,i7,i8 i3,i5,i7,i8 4,4,4,4 NULL 21 Using where
1 SIMPLE t0 index_merge i1,i2,i3,i5,i6,i7,i8 i3,i5,i7,i8 4,4,4,4 NULL 21 Using sort_union(i3,i5,i7,i8); Using where
explain select * from t0 where
((key3 <5 or key5 < 4) and (key1 < 4 or key2 < 4))
or
((key3 <7 or key5 < 2) and (key5 < 5 or key6 < 6));
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 index_merge i1,i2,i3,i5,i6 i3,i5 4,4 NULL 11 Using where
1 SIMPLE t0 index_merge i1,i2,i3,i5,i6 i3,i5 4,4 NULL 11 Using sort_union(i3,i5); Using where
explain select * from t0 where
((key3 <5 or key5 < 4) and (key1 < 4 or key2 < 4))
or
(((key3 <7 and key7 < 6) or key5 < 2) and (key5 < 5 or key6 < 6));
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 index_merge i1,i2,i3,i5,i6,i7 i3,i5 4,4 NULL 11 Using where
1 SIMPLE t0 index_merge i1,i2,i3,i5,i6,i7 i3,i5 4,4 NULL 11 Using sort_union(i3,i5); Using where
explain select * from t0 where
((key3 <5 or key5 < 4) and (key1 < 4 or key2 < 4))
or
......@@ -176,7 +176,7 @@ explain select * from t0 force index(i1, i2, i3, i4, i5, i6 ) where
or
((key3 >=5 or key5 < 2) and (key5 < 5 or key6 < 6));
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 index_merge i1,i2,i3,i5,i6 i3,i5 0,4 NULL 1024 Using where
1 SIMPLE t0 index_merge i1,i2,i3,i5,i6 i3,i5 0,4 NULL 1024 Using sort_union(i3,i5); Using where
select * from t0 where key1 < 5 or key8 < 4 order by key1;
key1 key2 key3 key4 key5 key6 key7 key8
1 1 1 1 1 1 1 1023
......@@ -190,7 +190,7 @@ key1 key2 key3 key4 key5 key6 key7 key8
explain
select * from t0 where key1 < 5 or key8 < 4 order by key1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 index_merge i1,i8 i1,i8 4,4 NULL 9 Using where; Using filesort
1 SIMPLE t0 index_merge i1,i8 i1,i8 4,4 NULL 9 Using sort_union(i1,i8); Using where; Using filesort
create table t2 like t0;
insert into t2 select * from t0;
alter table t2 add index i1_3(key1, key3);
......@@ -200,7 +200,7 @@ alter table t2 drop index i2;
alter table t2 add index i321(key3, key2, key1);
explain select key3 from t2 where key1 = 100 or key2 = 100;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index_merge i1_3,i2_3 i1_3,i2_3 4,4 NULL 2 Using where
1 SIMPLE t2 index_merge i1_3,i2_3 i1_3,i2_3 4,4 NULL 2 Using sort_union(i1_3,i2_3); Using where
explain select key3 from t2 where key1 <100 or key2 < 100;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 index i1_3,i2_3 i321 12 NULL 1024 Using where; Using index
......@@ -226,7 +226,7 @@ key1a key1b key2 key2_1 key2_2 key3
4 4 0 4 4 4
explain select * from t4 where key1a = 3 or key1b = 4;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t4 index_merge i1a,i1b i1a,i1b 4,4 NULL 2 Using where
1 SIMPLE t4 index_merge i1a,i1b i1a,i1b 4,4 NULL 2 Using sort_union(i1a,i1b); Using where
explain select * from t4 where key2 = 1 and (key2_1 = 1 or key3 = 5);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t4 ref i2_1,i2_2 i2_1 4 const 10 Using where
......@@ -241,7 +241,7 @@ insert into t1 select * from t0;
explain select * from t0 left join t1 on (t0.key1=t1.key1)
where t0.key1=3 or t0.key2=4;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 2 Using where
1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 2 Using union(i1,i2); Using where
1 SIMPLE t1 ref i1 i1 4 test.t0.key1 1
select * from t0 left join t1 on (t0.key1=t1.key1)
where t0.key1=3 or t0.key2=4;
......@@ -251,13 +251,13 @@ key1 key2 key3 key4 key5 key6 key7 key8 key1 key2 key3 key4 key5 key6 key7 key8
explain
select * from t0,t1 where (t0.key1=t1.key1) and ( t0.key1=3 or t0.key2=4);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 2 Using where
1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 2 Using union(i1,i2); Using where
1 SIMPLE t1 ref i1 i1 4 test.t0.key1 1
explain
select * from t0,t1 where (t0.key1=t1.key1) and
(t0.key1=3 or t0.key2=4) and t1.key1<200;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 2 Using where
1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 2 Using union(i1,i2); Using where
1 SIMPLE t1 ref i1 i1 4 test.t0.key1 1 Using where
explain
select * from t0,t1 where (t0.key1=t1.key1) and
......@@ -269,7 +269,7 @@ explain select * from t0,t1 where t0.key1 = 5 and
(t1.key1 = t0.key1 or t1.key8 = t0.key1);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 ref i1 i1 4 const 1 Using where
1 SIMPLE t1 index_merge i1,i8 i1,i8 4,4 NULL 2 Using where
1 SIMPLE t1 index_merge i1,i8 i1,i8 4,4 NULL 2 Using union(i1,i8); Using where
explain select * from t0,t1 where t0.key1 < 3 and
(t1.key1 = t0.key1 or t1.key8 = t0.key1);
id select_type table type possible_keys key key_len ref rows Extra
......@@ -278,12 +278,12 @@ id select_type table type possible_keys key key_len ref rows Extra
explain select * from t1 where key1=3 or key2=4
union select * from t1 where key1<4 or key3=5;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 index_merge i1,i2 i1,i2 4,4 NULL 2 Using where
2 UNION t1 index_merge i1,i3 i1,i3 4,4 NULL 5 Using where
1 PRIMARY t1 index_merge i1,i2 i1,i2 4,4 NULL 2 Using union(i1,i2); Using where
2 UNION t1 index_merge i1,i3 i1,i3 4,4 NULL 5 Using sort_union(i1,i3); Using where
explain select * from (select * from t1 where key1 = 3 or key2 =3) as Z where key8 >5;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY <derived2> system NULL NULL NULL NULL 1
2 DERIVED t1 index_merge i1,i2 i1,i2 4,4 NULL 2 Using where
2 DERIVED t1 index_merge i1,i2 i1,i2 4,4 NULL 2 Using union(i1,i2); Using where
create table t3 like t0;
insert into t3 select * from t0;
alter table t3 add key9 int not null, add index i9(key9);
......@@ -296,7 +296,7 @@ key1=1 or key2=2 or key3=3 or key4=4 or
key5=5 or key6=6 or key7=7 or key8=8 or
key9=9 or keyA=10 or keyB=11 or keyC=12;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 index_merge i1,i2,i3,i4,i5,i6,i7,i8,i9,iA,iB,iC i1,i2,i3,i4,i5,i6,i7,i8,i9,iA,iB,iC 4,4,4,4,4,4,4,4,4,4,4,4 NULL 12 Using where
1 SIMPLE t3 index_merge i1,i2,i3,i4,i5,i6,i7,i8,i9,iA,iB,iC i1,i2,i3,i4,i5,i6,i7,i8,i9,iA,iB,iC 4,4,4,4,4,4,4,4,4,4,4,4 NULL 12 Using union(i1,i2,i3,i4,i5,i6,i7,i8,i9,iA,iB,iC); Using where
select * from t3 where
key1=1 or key2=2 or key3=3 or key4=4 or
key5=5 or key6=6 or key7=7 or key8=8 or
......@@ -316,7 +316,7 @@ key1 key2 key3 key4 key5 key6 key7 key8 key9 keyA keyB keyC
1016 1016 1016 1016 1016 1016 1016 8 1016 1016 1016 1016
explain select * from t0 where key1 < 3 or key2 < 4;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 7 Using where
1 SIMPLE t0 index_merge i1,i2 i1,i2 4,4 NULL 7 Using sort_union(i1,i2); Using where
select * from t0 where key1 < 3 or key2 < 4;
key1 key2 key3 key4 key5 key6 key7 key8
1 1 1 1 1 1 1 1023
......
mysql-test/r/index_merge_innodb.result
View file @ dff98a8e
......@@ -8,7 +8,7 @@ INDEX i2(key2),
) engine=innodb;
explain select * from t1 where key1 < 5 or key2 > 197;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge i1,i2 i1,i2 4,4 NULL 8 Using where
1 SIMPLE t1 index_merge i1,i2 i1,i2 4,4 NULL 8 Using sort_union(i1,i2); Using where
select * from t1 where key1 < 5 or key2 > 197;
key1 key2
0 200
......@@ -18,7 +18,7 @@ key1 key2
4 196
explain select * from t1 where key1 < 3 or key2 > 195;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge i1,i2 i1,i2 4,4 NULL 8 Using where
1 SIMPLE t1 index_merge i1,i2 i1,i2 4,4 NULL 8 Using sort_union(i1,i2); Using where
select * from t1 where key1 < 3 or key2 > 195;
key1 key2
0 200
......@@ -34,7 +34,7 @@ update t1 set str1='aaa', str2='bbb', str3=concat(key2, '-', key1 div 2, '_' ,if
alter table t1 add primary key (str1, zeroval, str2, str3);
explain select * from t1 where key1 < 5 or key2 > 197;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge i1,i2 i1,i2 4,4 NULL 8 Using where
1 SIMPLE t1 index_merge i1,i2 i1,i2 4,4 NULL 8 Using sort_union(i1,i2); Using where
select * from t1 where key1 < 5 or key2 > 197;
key1 key2 str1 zeroval str2 str3
4 196 aaa 0 bbb 196-2_a
......@@ -44,7 +44,7 @@ key1 key2 str1 zeroval str2 str3
0 200 aaa 0 bbb 200-0_a
explain select * from t1 where key1 < 3 or key2 > 195;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge i1,i2 i1,i2 4,4 NULL 8 Using where
1 SIMPLE t1 index_merge i1,i2 i1,i2 4,4 NULL 8 Using sort_union(i1,i2); Using where
select * from t1 where key1 < 3 or key2 > 195;
key1 key2 str1 zeroval str2 str3
4 196 aaa 0 bbb 196-2_a
......
mysql-test/r/index_merge_ror.result
View file @ dff98a8e
drop table if exists t1,t0;
drop table if exists t0,t1,t2;
select count(*) from t1;
count(*)
64801
explain select key1,key2 from t1 where key1=100 and key2=100;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge key1,key2 key1,key2 5,5 NULL 3 Using where; Using index
1 SIMPLE t1 index_merge key1,key2 key1,key2 5,5 NULL 3 Using intersect(key1,key2); Using where; Using index
select key1,key2 from t1 where key1=100 and key2=100;
key1 key2
100 100
explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge key1,key2,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 8 Using where
1 SIMPLE t1 index_merge key1,key2,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 8 Using union(intersect(key1,key2),intersect(key3,key4)); Using where
select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
key1 key2 key3 key4 filler1
100 100 100 100 key1-key2-key3-key4
......@@ -18,21 +18,21 @@ insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, -1, -1, 'key1
insert into t1 (key1, key2, key3, key4, filler1) values (-1, -1, 100, 100, 'key4-key3');
explain select key1,key2,filler1 from t1 where key1=100 and key2=100;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge key1,key2 key1,key2 5,5 NULL 3 Using where
1 SIMPLE t1 index_merge key1,key2 key1,key2 5,5 NULL 3 Using intersect(key1,key2); Using where
select key1,key2,filler1 from t1 where key1=100 and key2=100;
key1 key2 filler1
100 100 key1-key2-key3-key4
100 100 key1-key2
explain select key1,key2 from t1 where key1=100 and key2=100;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge key1,key2 key1,key2 5,5 NULL 3 Using where; Using index
1 SIMPLE t1 index_merge key1,key2 key1,key2 5,5 NULL 3 Using intersect(key1,key2); Using where; Using index
select key1,key2 from t1 where key1=100 and key2=100;
key1 key2
100 100
100 100
explain select key1,key2,key3,key4 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge key1,key2,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 8 Using where
1 SIMPLE t1 index_merge key1,key2,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 8 Using union(intersect(key1,key2),intersect(key3,key4)); Using where
select key1,key2,key3,key4 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
key1 key2 key3 key4
100 100 100 100
......@@ -40,7 +40,7 @@ key1 key2 key3 key4
-1 -1 100 100
explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge key1,key2,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 8 Using where
1 SIMPLE t1 index_merge key1,key2,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 8 Using union(intersect(key1,key2),intersect(key3,key4)); Using where
select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
key1 key2 key3 key4 filler1
100 100 100 100 key1-key2-key3-key4
......@@ -48,14 +48,14 @@ key1 key2 key3 key4 filler1
-1 -1 100 100 key4-key3
explain select key1,key2,key3 from t1 where key1=100 and key2=100 and key3=100;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge key1,key2,key3 key1,key2,key3 5,5,5 NULL 1 Using where; Using index
1 SIMPLE t1 index_merge key1,key2,key3 key1,key2,key3 5,5,5 NULL 1 Using intersect(key1,key2,key3); Using where; Using index
select key1,key2,key3 from t1 where key1=100 and key2=100 and key3=100;
key1 key2 key3
100 100 100
insert into t1 (key1,key2,key3,key4,filler1) values (101,101,101,101, 'key1234-101');
explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=101;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge key1,key2,key3 key1,key2,key3 5,5,5 NULL 5 Using where
1 SIMPLE t1 index_merge key1,key2,key3 key1,key2,key3 5,5,5 NULL 5 Using union(intersect(key1,key2),key3); Using where
select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=101;
key1 key2 key3 key4 filler1
100 100 100 100 key1-key2-key3-key4
......@@ -72,19 +72,19 @@ select key1,key2,filler1 from t1 where key2=100 and key2=200;
key1 key2 filler1
explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge key1,key2,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 8 Using where
1 SIMPLE t1 index_merge key1,key2,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 8 Using union(intersect(key1,key2),intersect(key3,key4)); Using where
select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
key1 key2 key3 key4 filler1
-1 -1 100 100 key4-key3
delete from t1 where key3=100 and key4=100;
explain select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge key1,key2,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 8 Using where
1 SIMPLE t1 index_merge key1,key2,key3,key4 key1,key2,key3,key4 5,5,5,5 NULL 8 Using union(intersect(key1,key2),intersect(key3,key4)); Using where
select key1,key2,key3,key4,filler1 from t1 where key1=100 and key2=100 or key3=100 and key4=100;
key1 key2 key3 key4 filler1
explain select key1,key2 from t1 where key1=100 and key2=100;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge key1,key2 key1,key2 5,5 NULL 3 Using where; Using index
1 SIMPLE t1 index_merge key1,key2 key1,key2 5,5 NULL 3 Using intersect(key1,key2); Using where; Using index
select key1,key2 from t1 where key1=100 and key2=100;
key1 key2
insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, 200, 200,'key1-key2-key3-key4-1');
......@@ -92,7 +92,7 @@ insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, 200, 200,'key
insert into t1 (key1, key2, key3, key4, filler1) values (100, 100, 200, 200,'key1-key2-key3-key4-3');
explain select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge key1,key2,key3,key4 key3,key1,key2,key4 5,5,5,5 NULL 16 Using where
1 SIMPLE t1 index_merge key1,key2,key3,key4 key3,key1,key2,key4 5,5,5,5 NULL 16 Using union(key3,intersect(key1,key2),key4); Using where
select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
key1 key2 key3 key4 filler1
100 100 200 200 key1-key2-key3-key4-3
......@@ -101,7 +101,7 @@ key1 key2 key3 key4 filler1
insert into t1 (key1, key2, key3, key4, filler1) values (-1, -1, -1, 200,'key4');
explain select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge key1,key2,key3,key4 key3,key1,key2,key4 5,5,5,5 NULL 18 Using where
1 SIMPLE t1 index_merge key1,key2,key3,key4 key3,key1,key2,key4 5,5,5,5 NULL 18 Using union(key3,intersect(key1,key2),key4); Using where
select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
key1 key2 key3 key4 filler1
100 100 200 200 key1-key2-key3-key4-3
......@@ -111,7 +111,7 @@ key1 key2 key3 key4 filler1
insert into t1 (key1, key2, key3, key4, filler1) values (-1, -1, 200, -1,'key3');
explain select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge key1,key2,key3,key4 key3,key1,key2,key4 5,5,5,5 NULL 20 Using where
1 SIMPLE t1 index_merge key1,key2,key3,key4 key3,key1,key2,key4 5,5,5,5 NULL 20 Using union(key3,intersect(key1,key2),key4); Using where
select key1,key2,key3,key4,filler1 from t1 where key3=200 or (key1=100 and key2=100) or key4=200;
key1 key2 key3 key4 filler1
100 100 200 200 key1-key2-key3-key4-3
......@@ -121,10 +121,10 @@ key1 key2 key3 key4 filler1
-1 -1 200 -1 key3
explain select * from t1 where st_a=1 and st_b=1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b st_a,st_b 4,4 NULL 2508 Using where
1 SIMPLE t1 index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b st_a,st_b 4,4 NULL 2508 Using intersect(st_a,st_b); Using where
explain select st_a,st_b from t1 where st_a=1 and st_b=1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b st_a,st_b 4,4 NULL 2508 Using where; Using index
1 SIMPLE t1 index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b st_a,st_b 4,4 NULL 2508 Using intersect(st_a,st_b); Using where; Using index
explain select st_a from t1 ignore index (st_a) where st_a=1 and st_b=1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,stb_swt1a_2b,stb_swt1b,st_b st_b 4 const 14720 Using where
......@@ -136,33 +136,60 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref stb_swt1a_2b,stb_swt1b,st_b stb_swt1b 8 const,const 3757 Using where
explain select * from t1 where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt12a,stb_swt1a_2b 12,12 NULL 42 Using where
1 SIMPLE t1 index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt12a,stb_swt1a_2b 12,12 NULL 42 Using intersect(sta_swt12a,stb_swt1a_2b); Using where
explain select * from t1 ignore index (sta_swt21a, stb_swt1a_2b)
where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge sta_swt12a,sta_swt1a,sta_swt2a,st_a,stb_swt1b,st_b sta_swt12a,stb_swt1b 12,8 NULL 42 Using where
1 SIMPLE t1 index_merge sta_swt12a,sta_swt1a,sta_swt2a,st_a,stb_swt1b,st_b sta_swt12a,stb_swt1b 12,8 NULL 42 Using intersect(sta_swt12a,stb_swt1b); Using where
explain select * from t1 ignore index (sta_swt21a, sta_swt12a, stb_swt1a_2b)
where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge sta_swt1a,sta_swt2a,st_a,stb_swt1b,st_b sta_swt1a,stb_swt1b 8,8 NULL 163 Using where
1 SIMPLE t1 index_merge sta_swt1a,sta_swt2a,st_a,stb_swt1b,st_b sta_swt1a,sta_swt2a,stb_swt1b 8,8,8 NULL 41 Using intersect(sta_swt1a,sta_swt2a,stb_swt1b); Using where
explain select * from t1 ignore index (sta_swt21a, sta_swt12a, stb_swt1a_2b, stb_swt1b)
where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1 and swt2b=1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge sta_swt1a,sta_swt2a,st_a,st_b sta_swt1a,st_b 8,4 NULL 640 Using where
1 SIMPLE t1 index_merge sta_swt1a,sta_swt2a,st_a,st_b sta_swt1a,sta_swt2a,st_b 8,8,4 NULL 159 Using intersect(sta_swt1a,sta_swt2a,st_b); Using where
explain select * from t1
where st_a=1 and swt1a=1 and swt2a=1 and st_b=1 and swt1b=1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt12a,stb_swt1a_2b 12,12 NULL 42 Using where
1 SIMPLE t1 index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt12a,stb_swt1a_2b 12,12 NULL 42 Using intersect(sta_swt12a,stb_swt1a_2b); Using where
explain select * from t1
where st_a=1 and swt1a=1 and st_b=1 and swt1b=1 and swt1b=1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt1a,stb_swt1b 8,8 NULL 163 Using where
1 SIMPLE t1 index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt1a,stb_swt1b 8,8 NULL 163 Using intersect(sta_swt1a,stb_swt1b); Using where
explain select st_a from t1
where st_a=1 and swt1a=1 and st_b=1 and swt1b=1 and swt1b=1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt1a,stb_swt1b 8,8 NULL 163 Using where; Using index
1 SIMPLE t1 index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt1a,stb_swt1b 8,8 NULL 163 Using intersect(sta_swt1a,stb_swt1b); Using where; Using index
explain select st_a from t1
where st_a=1 and swt1a=1 and st_b=1 and swt1b=1 and swt1b=1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt1a,stb_swt1b 8,8 NULL 163 Using where; Using index
1 SIMPLE t1 index_merge sta_swt12a,sta_swt1a,sta_swt2a,sta_swt21a,st_a,stb_swt1a_2b,stb_swt1b,st_b sta_swt1a,stb_swt1b 8,8 NULL 163 Using intersect(sta_swt1a,stb_swt1b); Using where; Using index
drop table t0,t1;
create table t2 (
a char(10),
b char(10),
filler1 char(255),
filler2 char(255),
key(a(5)),
key(b(5))
);
select count(a) from t2 where a='BBBBBBBB';
count(a)
4
select count(a) from t2 where b='BBBBBBBB';
count(a)
4
explain select count(a) from t2 where a='AAAAAAAA' and b='AAAAAAAA';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ref a,b a 6 const 4 Using where
select count(a) from t2 where a='AAAAAAAA' and b='AAAAAAAA';
count(a)
4
select count(a) from t2 ignore index(a,b) where a='AAAAAAAA' and b='AAAAAAAA';
count(a)
4
insert into t2 values ('ab', 'ab', 'uh', 'oh');
explain select a from t2 where a='ab';
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ref a a 6 const 1 Using where
mysql-test/r/index_merge_ror_cpk.result
View file @ dff98a8e
......@@ -41,7 +41,7 @@ pk1 pk2 key1 key2 pktail1ok pktail2ok pktail3bad pktail4bad pktail5bad pk2copy b
1 19 0 0 0 0 0 0 0 19 0 filler-data-19 filler2
explain select pk1,pk2 from t1 where key1 = 10 and key2=10 and 2*pk1+1 < 2*96+1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge key1,key2 key1,key2 4,4 NULL 1 Using where; Using index
1 SIMPLE t1 index_merge key1,key2 key1,key2 4,4 NULL 1 Using intersect(key1,key2); Using where; Using index
select pk1,pk2 from t1 where key1 = 10 and key2=10 and 2*pk1+1 < 2*96+1;
pk1 pk2
95 50
......@@ -59,13 +59,19 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref key1 key1 4 const 101 Using where
explain select * from t1 where pk1 < 7500 and key1 = 10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge PRIMARY,key1 key1,PRIMARY 4,4 NULL 38 Using where
1 SIMPLE t1 index_merge PRIMARY,key1 key1,PRIMARY 4,4 NULL 38 Using intersect(key1,PRIMARY); Using where
explain select * from t1 where pktail1ok=1 and key1=10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge key1,pktail1ok key1,pktail1ok 4,4 NULL 1 Using where
1 SIMPLE t1 index_merge key1,pktail1ok key1,pktail1ok 4,4 NULL 1 Using intersect(key1,pktail1ok); Using where
explain select * from t1 where pktail2ok=1 and key1=10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge key1,pktail2ok key1,pktail2ok 4,4 NULL 1 Using where
1 SIMPLE t1 index_merge key1,pktail2ok key1,pktail2ok 4,4 NULL 1 Using intersect(key1,pktail2ok); Using where
select ' The following is actually a deficiency, it uses sort_union currently:' as 'note:';
note:
The following is actually a deficiency, it uses sort_union currently:
explain select * from t1 where (pktail2ok=1 and pk1< 50000) or key1=10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge PRIMARY,key1,pktail2ok pktail2ok,key1 8,4 NULL 199 Using sort_union(pktail2ok,key1); Using where
explain select * from t1 where pktail3bad=1 and key1=10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref key1,pktail3bad pktail3bad 4 const 98 Using where
......@@ -77,7 +83,7 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref key1,pktail5bad pktail5bad 4 const 99 Using where
explain select pk1,pk2,key1,key2 from t1 where key1 = 10 and key2=10 limit 10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge key1,key2 key1,key2 4,4 NULL 1 Using where; Using index
1 SIMPLE t1 index_merge key1,key2 key1,key2 4,4 NULL 1 Using intersect(key1,key2); Using where; Using index
select pk1,pk2,key1,key2 from t1 where key1 = 10 and key2=10 limit 10;
pk1 pk2 key1 key2
95 50 10 10
......
mysql-test/t/index_merge_ror.test
View file @ dff98a8e
......@@ -2,7 +2,7 @@
# ROR-index_merge tests.
#
--disable_warnings
drop table if exists t1,t0;
drop table if exists t0,t1,t2;
--enable_warnings
--disable_query_log
create table t1
......@@ -213,3 +213,37 @@ explain select st_a from t1
drop table t0,t1;
# 'Partially' covered fields test
create table t2 (
a char(10),
b char(10),
filler1 char(255),
filler2 char(255),
key(a(5)),
key(b(5))
);
--disable_query_log
let $1=8;
while ($1)
{
eval insert into t2 values (repeat(char($1+64), 8),repeat(char($1+64), 8),'filler1', 'filler2');
dec $1;
}
insert into t2 select * from t2;
insert into t2 select * from t2;
--enable_query_log
# The table row buffer is reused. Fill it with rows that don't match.
select count(a) from t2 where a='BBBBBBBB';
select count(a) from t2 where b='BBBBBBBB';
# BUG#1:
explain select count(a) from t2 where a='AAAAAAAA' and b='AAAAAAAA';
select count(a) from t2 where a='AAAAAAAA' and b='AAAAAAAA';
select count(a) from t2 ignore index(a,b) where a='AAAAAAAA' and b='AAAAAAAA';
insert into t2 values ('ab', 'ab', 'uh', 'oh');
explain select a from t2 where a='ab';
drop table t2;
mysql-test/t/index_merge_ror_cpk.test
View file @ dff98a8e
......@@ -69,6 +69,9 @@ explain select * from t1 where pk1 < 7500 and key1 = 10;
explain select * from t1 where pktail1ok=1 and key1=10;
explain select * from t1 where pktail2ok=1 and key1=10;
select ' The following is actually a deficiency, it uses sort_union currently:' as 'note:';
explain select * from t1 where (pktail2ok=1 and pk1< 50000) or key1=10;
explain select * from t1 where pktail3bad=1 and key1=10;
explain select * from t1 where pktail4bad=1 and key1=10;
explain select * from t1 where pktail5bad=1 and key1=10;
......
mysys/my_bitmap.c
View file @ dff98a8e
......@@ -28,6 +28,9 @@
* when both arguments are bitmaps, they must be of the same size
* bitmap_intersect() is an exception :)
(for for Bitmap::intersect(ulonglong map2buff))
If THREAD is defined all bitmap operations except bitmap_init/bitmap_free
are thread-safe.
TODO:
Make assembler THREAD safe versions of these using test-and-set instructions
......@@ -332,29 +335,36 @@ void bitmap_union(MY_BITMAP *map, const MY_BITMAP *map2)
/*
Get number of set bits in the bitmap
SYNOPSIS
bitmap_bits_set()
map
RETURN
Number of set bits in the bitmap.
*/
uint bitmap_bits_set(const MY_BITMAP *map)
{
uchar *m= map->bitmap,
*end= map->bitmap+map->bitmap_size;
uchar *m= map->bitmap;
uchar *end= m + map->bitmap_size;
uint res= 0;
DBUG_ASSERT(map->bitmap);
bitmap_lock((MY_BITMAP *)map);
while (m < end)
{
res+= my_count_bits_ushort(*m++);
}
bitmap_unlock((MY_BITMAP *)map);
return res;
}
/*
Return number of first zero bit or MY_BIT_NONE if all bits are set.
SYNOPSIS
bitmap_get_first()
map
RETURN
Number of first unset bit in the bitmap or MY_BIT_NONE if all bits are set.
*/
uint bitmap_get_first(const MY_BITMAP *map)
......
sql/opt_range.cc
View file @ dff98a8e
......@@ -199,19 +199,7 @@ class SEL_ARG :public Sql_alloc
void store(uint length,char **min_key,uint min_key_flag,
char **max_key, uint max_key_flag)
{
if ((min_flag & GEOM_FLAG) ||
(!(min_flag & NO_MIN_RANGE) &&
!(min_key_flag & (NO_MIN_RANGE | NEAR_MIN))))
{
if (maybe_null && *min_value)
{
**min_key=1;
bzero(*min_key+1,length);
}
else
memcpy(*min_key,min_value,length+(int) maybe_null);
(*min_key)+= length+(int) maybe_null;
}
store_min(length, min_key, min_key_flag);
if (!(max_flag & NO_MAX_RANGE) &&
!(max_key_flag & (NO_MAX_RANGE | NEAR_MAX)))
{
......@@ -298,6 +286,7 @@ class SEL_ARG :public Sql_alloc
class SEL_IMERGE;
class SEL_TREE :public Sql_alloc
{
public:
......@@ -319,7 +308,7 @@ class SEL_TREE :public Sql_alloc
/* The members below are filled/used only after get_mm_tree is done */
key_map ror_scans_map; /* bitmask of ROR scan-able elements in keys */
uint n_ror_scans;
uint n_ror_scans; /* number of set bits in ror_scans_map */
struct st_ror_scan_info **ror_scans; /* list of ROR key scans */
struct st_ror_scan_info **ror_scans_end; /* last ROR scan */
......@@ -330,7 +319,8 @@ class SEL_TREE :public Sql_alloc
typedef struct st_qsel_param {
THD *thd;
TABLE *table;
KEY_PART *key_parts,*key_parts_end,*key[MAX_KEY];
KEY_PART *key_parts,*key_parts_end;
KEY_PART *key[MAX_KEY]; /* First key parts of keys used in the query */
MEM_ROOT *mem_root;
table_map prev_tables,read_tables,current_table;
uint baseflag, max_key_part, range_count;
......@@ -353,7 +343,8 @@ typedef struct st_qsel_param {
uint *imerge_cost_buff; /* buffer for index_merge cost estimates */
uint imerge_cost_buff_size; /* size of the buffer */
bool is_ror_scan; /* true if last checked tree->key can be used for ROR-scan */
/* true if last checked tree->key can be used for ROR-scan */
bool is_ror_scan;
} PARAM;
class TABLE_READ_PLAN;
......@@ -625,7 +616,6 @@ int imerge_list_or_list(PARAM *param,
RETURN
0 OK, result is stored in *im1.
other Error
*/
int imerge_list_or_tree(PARAM *param,
......@@ -767,11 +757,12 @@ QUICK_INDEX_MERGE_SELECT::QUICK_INDEX_MERGE_SELECT(THD *thd_param,
:cur_quick_it(quick_selects),pk_quick_select(NULL),unique(NULL),
thd(thd_param)
{
DBUG_ENTER("QUICK_INDEX_MERGE_SELECT::QUICK_INDEX_MERGE_SELECT");
index= MAX_KEY;
head= table;
reset_called= false;
bzero(&read_record, sizeof(read_record));
init_sql_alloc(&alloc,1024,0);
DBUG_VOID_RETURN;
}
int QUICK_INDEX_MERGE_SELECT::init()
......@@ -785,11 +776,7 @@ int QUICK_INDEX_MERGE_SELECT::reset()
{
int result;
DBUG_ENTER("QUICK_INDEX_MERGE_SELECT::reset");
if (reset_called)
DBUG_RETURN(0);
reset_called= true;
result = cur_quick_select->reset() || prepare_unique();
result= cur_quick_select->reset() || prepare_unique();
DBUG_RETURN(result);
}
......@@ -810,10 +797,12 @@ QUICK_INDEX_MERGE_SELECT::push_quick_back(QUICK_RANGE_SELECT *quick_sel_range)
QUICK_INDEX_MERGE_SELECT::~QUICK_INDEX_MERGE_SELECT()
{
DBUG_ENTER("QUICK_INDEX_MERGE_SELECT::~QUICK_INDEX_MERGE_SELECT");
delete unique;
quick_selects.delete_elements();
delete pk_quick_select;
free_root(&alloc,MYF(0));
DBUG_VOID_RETURN;
}
......@@ -821,8 +810,7 @@ QUICK_ROR_INTERSECT_SELECT::QUICK_ROR_INTERSECT_SELECT(THD *thd_param,
TABLE *table,
bool retrieve_full_rows,
MEM_ROOT *parent_alloc)
: cpk_quick(NULL), thd(thd_param), reset_called(false),
need_to_fetch_row(retrieve_full_rows)
: cpk_quick(NULL), thd(thd_param), need_to_fetch_row(retrieve_full_rows)
{
index= MAX_KEY;
head= table;
......@@ -835,28 +823,50 @@ QUICK_ROR_INTERSECT_SELECT::QUICK_ROR_INTERSECT_SELECT(THD *thd_param,
head->file->ref_length);
}
/*
Do post-constructor initialization.
SYNOPSIS
QUICK_ROR_INTERSECT_SELECT::init()
RETURN
0 OK
other Error code
*/
int QUICK_ROR_INTERSECT_SELECT::init()
{
/* Check if last_rowid was allocated in ctor */
/* Check if last_rowid was successfully allocated in ctor */
return !last_rowid;
}
/*
Init this quick select to be a ROR child scan.
NOTE
QUICK_ROR_INTERSECT_SELECT::reset() may choose not to call this function
but reuse its handler object for doing one of range scans. It duplicates
a part of this function' code.
Initialize this quick select to be a ROR-merged scan.
SYNOPSIS
QUICK_RANGE_SELECT::init_ror_merged_scan()
reuse_handler If true, use head->file, otherwise create a separate
handler object
NOTES
This function creates and prepares for subsequent use a separate handler
object if it can't reuse head->file. The reason for this is that during
ROR-merge several key scans are performed simultaneously, and a single
handler is only capable of preserving context of a single key scan.
In ROR-merge the quick select doing merge does full records retrieval,
merged quick selects read only keys.
RETURN
0 ROR child scan initialized, ok to use.
1 error
*/
int QUICK_RANGE_SELECT::init_ror_child_scan(bool reuse_handler)
int QUICK_RANGE_SELECT::init_ror_merged_scan(bool reuse_handler)
{
handler *save_file= file;
DBUG_ENTER("QUICK_RANGE_SELECT::init_ror_child_scan");
DBUG_ENTER("QUICK_RANGE_SELECT::init_ror_merged_scan");
if (reuse_handler)
{
......@@ -894,7 +904,7 @@ int QUICK_RANGE_SELECT::init_ror_child_scan(bool reuse_handler)
file->close();
goto failure;
}
free_file= true;
free_file= true;
last_rowid= file->ref;
DBUG_RETURN(0);
......@@ -903,32 +913,42 @@ int QUICK_RANGE_SELECT::init_ror_child_scan(bool reuse_handler)
DBUG_RETURN(1);
}
int QUICK_ROR_INTERSECT_SELECT::init_ror_child_scan(bool reuse_handler)
/*
Initialize this quick select to be a part of a ROR-merged scan.
SYNOPSIS
QUICK_ROR_INTERSECT_SELECT::init_ror_merged_scan()
reuse_handler If true, use head->file, otherwise create separate
handler object.
RETURN
0 OK
other error code
*/
int QUICK_ROR_INTERSECT_SELECT::init_ror_merged_scan(bool reuse_handler)
{
List_iterator_fast<QUICK_RANGE_SELECT> quick_it(quick_selects);
QUICK_RANGE_SELECT* quick;
DBUG_ENTER("QUICK_ROR_INTERSECT_SELECT::init_ror_child_scan");
DBUG_ENTER("QUICK_ROR_INTERSECT_SELECT::init_ror_merged_scan");
/* Initialize all merged "children" quick selects */
quick_it.rewind();
DBUG_ASSERT(!(need_to_fetch_row && !reuse_handler));
if (!need_to_fetch_row && reuse_handler)
{
quick= quick_it++;
/*
There is no use for this->file. Reuse it for first of merged range
There is no use of this->file. Use it for the first of merged range
selects.
*/
if (quick->init_ror_child_scan(true))
if (quick->init_ror_merged_scan(true))
DBUG_RETURN(1);
quick->file->extra(HA_EXTRA_KEYREAD_PRESERVE_FIELDS);
}
while((quick= quick_it++))
{
if (quick->init_ror_child_scan(false))
if (quick->init_ror_merged_scan(false))
DBUG_RETURN(1);
quick->file->extra(HA_EXTRA_KEYREAD_PRESERVE_FIELDS);
/* Share the same record structure in intersect*/
/* All merged scans share the same record buffer in intersection. */
quick->record= head->record[0];
}
......@@ -940,27 +960,44 @@ int QUICK_ROR_INTERSECT_SELECT::init_ror_child_scan(bool reuse_handler)
DBUG_RETURN(0);
}
/*
Initialize quick select for row retrieval.
SYNOPSIS
reset()
RETURN
0 OK
other Error code
*/
int QUICK_ROR_INTERSECT_SELECT::reset()
{
int result;
DBUG_ENTER("QUICK_ROR_INTERSECT_SELECT::reset");
result= init_ror_child_scan(true);
result= init_ror_merged_scan(true);
DBUG_RETURN(result);
}
/*
Add a merged quick select to this ROR-intersection quick select.
SYNOPSIS
QUICK_ROR_INTERSECT_SELECT::push_quick_back()
quick Quick select to be added. The quick select must return
rows in rowid order.
NOTES
This call can only be made before init() is called.
RETURN
false OK
true Out of memory.
*/
bool
QUICK_ROR_INTERSECT_SELECT::push_quick_back(QUICK_RANGE_SELECT *quick)
{
bool res;
if (head->file->primary_key_is_clustered() &&
quick->index == head->primary_key)
{
cpk_quick= quick;
res= 0;
}
else
res= quick_selects.push_back(quick);
return res;
return quick_selects.push_back(quick);
}
QUICK_ROR_INTERSECT_SELECT::~QUICK_ROR_INTERSECT_SELECT()
......@@ -974,7 +1011,7 @@ QUICK_ROR_INTERSECT_SELECT::~QUICK_ROR_INTERSECT_SELECT()
QUICK_ROR_UNION_SELECT::QUICK_ROR_UNION_SELECT(THD *thd_param,
TABLE *table)
: thd(thd_param), reset_called(false)
: thd(thd_param)
{
index= MAX_KEY;
head= table;
......@@ -984,6 +1021,17 @@ QUICK_ROR_UNION_SELECT::QUICK_ROR_UNION_SELECT(THD *thd_param,
my_pthread_setspecific_ptr(THR_MALLOC,&alloc);
}
/*
Do post-constructor initialization.
SYNOPSIS
QUICK_ROR_UNION_SELECT::init()
RETURN
0 OK
other Error code
*/
int QUICK_ROR_UNION_SELECT::init()
{
if (init_queue(&queue, quick_selects.elements, 0,
......@@ -1000,8 +1048,11 @@ int QUICK_ROR_UNION_SELECT::init()
return 0;
}
/*
Comparison function to be used by priority queue.
Comparison function to be used QUICK_ROR_UNION_SELECT::queue priority
queue.
SYNPOSIS
QUICK_ROR_UNION_SELECT::queue_cmp()
arg Pointer to QUICK_ROR_UNION_SELECT
......@@ -1010,11 +1061,22 @@ int QUICK_ROR_UNION_SELECT::init()
*/
int QUICK_ROR_UNION_SELECT::queue_cmp(void *arg, byte *val1, byte *val2)
{
QUICK_ROR_UNION_SELECT *self= (QUICK_ROR_UNION_SELECT*)arg;
QUICK_ROR_UNION_SELECT *self= (QUICK_ROR_UNION_SELECT*)arg;
return self->head->file->cmp_ref(((QUICK_SELECT_I*)val1)->last_rowid,
((QUICK_SELECT_I*)val2)->last_rowid);
}
/*
Initialize quick select for row retrieval.
SYNOPSIS
reset()
RETURN
0 OK
other Error code
*/
int QUICK_ROR_UNION_SELECT::reset()
{
QUICK_SELECT_I* quick;
......@@ -1028,7 +1090,7 @@ int QUICK_ROR_UNION_SELECT::reset()
List_iterator_fast<QUICK_SELECT_I> it(quick_selects);
while ((quick= it++))
{
if (quick->init_ror_child_scan(false))
if (quick->init_ror_merged_scan(false))
DBUG_RETURN(1);
if ((error= quick->get_next()))
{
......@@ -1245,13 +1307,33 @@ class TABLE_READ_PLAN
double read_cost;
ha_rows records; /* estimate of #rows to be examined */
/*
If true, the scan returns rows in rowid order. This is used only for
scans that can be both ROR and non-ROR.
*/
bool is_ror;
/* Create quck select for this plan */
/*
Create quick select for this plan.
SYNOPSIS
make_quick()
param Parameter from test_quick_select
retrieve_full_rows If true, created quick select will do full record
retrieval.
parent_alloc Memory pool to use, if any.
NOTES
retrieve_full_rows is ignored by some implementations.
RETURN
created quick select
NULL on any error.
*/
virtual QUICK_SELECT_I *make_quick(PARAM *param,
bool retrieve_full_rows,
MEM_ROOT *parent_alloc=NULL) = 0;
/* Table read plans are allocated on MEM_ROOT and must not be deleted */
/* Table read plans are allocated on MEM_ROOT and are never deleted */
static void *operator new(size_t size, MEM_ROOT *mem_root)
{ return (void*) alloc_root(mem_root, (uint) size); }
static void operator delete(void *ptr,size_t size) {}
......@@ -1262,11 +1344,19 @@ class TRP_ROR_UNION;
class TRP_INDEX_MERGE;
/*
Plan for a QUICK_RANGE_SELECT scan.
TRP_RANGE::make_quick ignores retrieve_full_rows parameter because
QUICK_RANGE_SELECT doesn't distinguish between 'index only' scans and full
record retrieval scans.
*/
class TRP_RANGE : public TABLE_READ_PLAN
{
public:
SEL_ARG *key;
uint key_idx; /* key number in param->keys */
SEL_ARG *key; /* set of intervals to be used in "range" method retrieval */
uint key_idx; /* key number in PARAM::key */
TRP_RANGE(SEL_ARG *key_arg, uint idx_arg)
: key(key_arg), key_idx(idx_arg)
{}
......@@ -1276,7 +1366,6 @@ class TRP_RANGE : public TABLE_READ_PLAN
{
DBUG_ENTER("TRP_RANGE::make_quick");
QUICK_RANGE_SELECT *quick;
/* ignore retrieve_full_rows there as it is set/used elsewhere */
if ((quick= get_quick_select(param, key_idx, key, parent_alloc)))
{
quick->records= records;
......@@ -1286,45 +1375,68 @@ class TRP_RANGE : public TABLE_READ_PLAN
}
};
/* Plan for QUICK_ROR_INTERSECT_SELECT scan. */
class TRP_ROR_INTERSECT : public TABLE_READ_PLAN
{
public:
QUICK_SELECT_I *make_quick(PARAM *param, bool retrieve_full_rows,
MEM_ROOT *parent_alloc);
/* Array of pointers to ROR range scans used in this intersection */
struct st_ror_scan_info **first_scan;
struct st_ror_scan_info **last_scan;
struct st_ror_scan_info **last_scan; /* End of the above array */
struct st_ror_scan_info *cpk_scan; /* Clustered PK scan, if there is one */
bool is_covering; /* true if no row retrieval phase is necessary */
double index_scan_costs;
double index_scan_costs; /* SUM(cost(index_scan)) */
};
/*
ROR-union is currently never covering.
Plan for QUICK_ROR_UNION_SELECT scan.
QUICK_ROR_UNION_SELECT always retrieves full rows, so retrieve_full_rows
is ignored by make_quick.
*/
class TRP_ROR_UNION : public TABLE_READ_PLAN
{
public:
QUICK_SELECT_I *make_quick(PARAM *param, bool retrieve_full_rows,
MEM_ROOT *parent_alloc);
TABLE_READ_PLAN **first_ror;
TABLE_READ_PLAN **last_ror;
TABLE_READ_PLAN **first_ror; /* array of ptrs to plans for merged scans */
TABLE_READ_PLAN **last_ror; /* end of the above array */
};
/*
Plan for QUICK_INDEX_MERGE_SELECT scan.
QUICK_ROR_INTERSECT_SELECT always retrieves full rows, so retrieve_full_rows
is ignored by make_quick.
*/
class TRP_INDEX_MERGE : public TABLE_READ_PLAN
{
public:
QUICK_SELECT_I *make_quick(PARAM *param, bool retrieve_full_rows,
MEM_ROOT *parent_alloc);
TRP_RANGE **range_scans;
TRP_RANGE **range_scans_end;
TRP_RANGE **range_scans; /* array of ptrs to plans of merged scans */
TRP_RANGE **range_scans_end; /* end of the array */
};
/*
Fill param->needed_fields with bitmap of fields used in the query
NOTE
Do not put clustered PK members into it as they are implicitly present in
all keys.
Fill param->needed_fields with bitmap of fields used in the query.
SYNOPSIS
fill_used_fields_bitmap()
param Parameter from test_quick_select function.
NOTES
Clustered PK members are not put into the bitmap as they are implicitly
present in all keys (and it is impossible to avoid reading them).
RETURN
0 Ok
1 Out of memory.
*/
static int fill_used_fields_bitmap(PARAM *param)
......@@ -1348,6 +1460,7 @@ static int fill_used_fields_bitmap(PARAM *param)
pk= param->table->primary_key;
if (param->table->file->primary_key_is_clustered() && pk != MAX_KEY)
{
/* The table uses clustered PK and it is not internally generated */
KEY_PART_INFO *key_part= param->table->key_info[pk].key_part;
KEY_PART_INFO *key_part_end= key_part +
param->table->key_info[pk].key_parts;
......@@ -1361,28 +1474,39 @@ static int fill_used_fields_bitmap(PARAM *param)
/*
Test if a key can be used in different ranges
Test if a key can be used in different ranges
SYNOPSIS
SQL_SELECT::test_quick_select(thd,keys_to_use, prev_tables,
limit, force_quick_range)
SQL_SELECT::test_quick_select()
thd Current thread
keys_to_use Keys to use for range retrieval
prev_tables Tables assumed to be already read when the scan is
performed (but not read at the moment of this call)
limit Query limit
force_quick_range Prefer to use range (instead of full table scan) even
if it is more expensive.
NOTES
Updates the following in the select parameter:
needed_reg - Bits for keys with may be used if all prev regs are read
quick - Parameter to use when reading records.
In the table struct the following information is updated:
quick_keys - Which keys can be used
quick_rows - How many rows the key matches
Updates the following in the select parameter:
needed_reg - Bits for keys with may be used if all prev regs are read
quick - Parameter to use when reading records.
TODO
Check if this function really needs to modify keys_to_use, and change the
code to pass it by reference if it doesn't.
In addition to force_quick_range other means can be (an usually are) used
to make this function prefer range over full table scan. Figure out if
force_quick_range is really needed.
In the table struct the following information is updated:
quick_keys - Which keys can be used
quick_rows - How many rows the key matches
RETURN VALUES
-1 if impossible select
0 if can't use quick_select
1 if found usable range
TODO
check if the function really needs to modify keys_to_use, and change the
code to pass it by reference if not
RETURN
-1 if impossible select (i.e. certainly no rows will be selected)
0 if can't use quick_select
1 if found usable ranges and quick select has been successfully created.
*/
int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
......@@ -1393,6 +1517,7 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
uint idx;
double scan_time;
DBUG_ENTER("test_quick_select");
printf("\nQUERY: %s\n", thd->query);
DBUG_PRINT("enter",("keys_to_use: %lu prev_tables: %lu const_tables: %lu",
keys_to_use.to_ulonglong(), (ulong) prev_tables,
(ulong) const_tables));
......@@ -1485,6 +1610,18 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
}
param.key_parts_end=key_parts;
/* Calculate cost of full index read for the shortest covering index */
if (!head->used_keys.is_clear_all())
{
int key_for_use= find_shortest_key(head, &head->used_keys);
double key_read_time= get_index_only_read_time(&param, records,
key_for_use);
DBUG_PRINT("info", ("'all'+'using index' scan will be using key %d, "
"read time %g", key_for_use, key_read_time));
if (key_read_time < read_time)
read_time= key_read_time;
}
if ((tree=get_mm_tree(&param,cond)))
{
if (tree->type == SEL_TREE::IMPOSSIBLE)
......@@ -1499,8 +1636,6 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
/*
It is possible to use a quick select (but maybe it would be slower
than 'all' table scan).
Btw, tree type SEL_TREE::INDEX_MERGE was not introduced
intentionally.
*/
if (tree->merges.is_empty())
{
......@@ -1522,7 +1657,7 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
{
/*
Get best non-covering ROR-intersection plan and prepare data for
building covering ROR-intersection
building covering ROR-intersection.
*/
if ((new_trp= get_best_ror_intersect(&param, tree, false,
best_read_time,
......@@ -1550,25 +1685,6 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
LINT_INIT(new_conj_trp); /* no empty index_merge lists possible */
DBUG_PRINT("info",("No range reads possible,"
" trying to construct index_merge"));
/*
Calculate cost of 'all'+index_only scan if it is possible.
It is possible that table can be read in two ways:
a) 'all' + index_only
b) index_merge without index_only.
*/
if (!head->used_keys.is_clear_all())
{
int key_for_use= find_shortest_key(head, &head->used_keys);
ha_rows total_table_records= (0 == head->file->records)? 1 :
head->file->records;
read_time = get_index_only_read_time(&param, total_table_records,
key_for_use);
DBUG_PRINT("info",
("'all'+'using index' scan will be using key %d, "
"read time %g", key_for_use, read_time));
}
List_iterator_fast<SEL_IMERGE> it(tree->merges);
while ((imerge= it++))
{
......@@ -1579,8 +1695,9 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
}
best_trp= best_conj_trp;
}
my_pthread_setspecific_ptr(THR_MALLOC, old_root);
my_pthread_setspecific_ptr(THR_MALLOC, old_root);
/* If we got a read plan, create a quick select from it. */
if (best_trp)
{
records= best_trp->records;
......@@ -1589,7 +1706,7 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
delete quick;
quick= NULL;
}
}
}
}
}
my_pthread_setspecific_ptr(THR_MALLOC, old_root);
......@@ -1608,19 +1725,22 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
/*
Get cost of 'sweep' full row retrieveal of #records rows.
Get cost of 'sweep' full records retrieval.
SYNOPSIS
get_sweep_read_cost()
param Parameter from test_quick_select
records # of records to be retrieved
RETURN
0 - ok
1 - sweep is more expensive then full table scan.
cost of sweep
*/
bool get_sweep_read_cost(const PARAM *param, ha_rows records, double* cost,
double index_reads_cost, double max_cost)
double get_sweep_read_cost(const PARAM *param, ha_rows records)
{
double result;
if (param->table->file->primary_key_is_clustered())
{
*cost= param->table->file->read_time(param->table->primary_key,
records, records);
result= param->table->file->read_time(param->table->primary_key,
records, records);
}
else
{
......@@ -1630,8 +1750,8 @@ bool get_sweep_read_cost(const PARAM *param, ha_rows records, double* cost,
n_blocks * (1.0 - pow(1.0 - 1.0/n_blocks, rows2double(records)));
if (busy_blocks < 1.0)
busy_blocks= 1.0;
DBUG_PRINT("info",("sweep: nblocks= %g, busy_blocks=%g index_blocks=%g",
n_blocks, busy_blocks, index_reads_cost));
DBUG_PRINT("info",("sweep: nblocks=%g, busy_blocks=%g", n_blocks,
busy_blocks));
/*
Disabled: Bail out if # of blocks to read is bigger than # of blocks in
table data file.
......@@ -1642,7 +1762,7 @@ bool get_sweep_read_cost(const PARAM *param, ha_rows records, double* cost,
if (!join || join->tables == 1)
{
/* No join, assume reading is done in one 'sweep' */
*cost= busy_blocks*(DISK_SEEK_BASE_COST +
result= busy_blocks*(DISK_SEEK_BASE_COST +
DISK_SEEK_PROP_COST*n_blocks/busy_blocks);
}
else
......@@ -1651,11 +1771,11 @@ bool get_sweep_read_cost(const PARAM *param, ha_rows records, double* cost,
Possibly this is a join with source table being non-last table, so
assume that disk seeks are random here.
*/
*cost = busy_blocks;
result= busy_blocks;
}
}
DBUG_PRINT("info",("returning cost=%g", *cost));
return 0;
DBUG_PRINT("info",("returning cost=%g", result));
return result;
}
......@@ -1663,15 +1783,11 @@ bool get_sweep_read_cost(const PARAM *param, ha_rows records, double* cost,
Get best plan for a SEL_IMERGE disjunctive expression.
SYNOPSIS
get_best_disjunct_quick()
param
imerge
param Parameter from check_quick_select function
imerge Expression to use
read_time Don't create scans with cost > read_time
RETURN
read plan
NULL - OOM or no read scan could be built.
NOTES
index_merge cost is calculated as follows:
index_merge_cost =
cost(index_reads) + (see #1)
......@@ -1723,11 +1839,14 @@ bool get_sweep_read_cost(const PARAM *param, ha_rows records, double* cost,
ROR-union cost is calculated in the same way index_merge, but instead of
Unique a priority queue is used.
RETURN
Created read plan
NULL - Out of memory or no read scan could be built.
*/
static
TABLE_READ_PLAN *get_best_disjunct_quick(PARAM *param, SEL_IMERGE *imerge,
double read_time)
double read_time)
{
SEL_TREE **ptree;
TRP_INDEX_MERGE *imerge_trp= NULL;
......@@ -1823,12 +1942,11 @@ TABLE_READ_PLAN *get_best_disjunct_quick(PARAM *param, SEL_IMERGE *imerge,
}
/* Calculate cost(rowid_to_row_scan) */
if (get_sweep_read_cost(param, non_cpk_scan_records, &sweep_cost,
blocks_in_index_read, read_time))
goto build_ror_index_merge;
imerge_cost += sweep_cost;
imerge_cost += get_sweep_read_cost(param, non_cpk_scan_records);
DBUG_PRINT("info",("index_merge cost with rowid-to-row scan: %g",
imerge_cost));
if (imerge_cost > read_time)
goto build_ror_index_merge;
/* Add Unique operations cost */
unique_calc_buff_size=
......@@ -1923,7 +2041,7 @@ TABLE_READ_PLAN *get_best_disjunct_quick(PARAM *param, SEL_IMERGE *imerge,
/*
rows to retrieve=
SUM(rows_in_scan_i) - table_rows * PROD(rows_in_scan_i / table_rows).
This is valid because index_merge constructuion guarantees that conditions
This is valid because index_merge construction guarantees that conditions
in disjunction do not share key parts.
*/
roru_total_records -= (ha_rows)(roru_intersect_part*
......@@ -1937,14 +2055,12 @@ TABLE_READ_PLAN *get_best_disjunct_quick(PARAM *param, SEL_IMERGE *imerge,
See get_merge_buffers_cost function for queue_use_cost formula derivation.
*/
if (get_sweep_read_cost(param, roru_total_records, &sweep_cost,
roru_index_costs, read_time))
DBUG_RETURN(NULL);
double roru_total_cost;
roru_total_cost= roru_index_costs +
rows2double(roru_total_records)*log(n_child_scans) /
(TIME_FOR_COMPARE_ROWID * M_LN2) +
sweep_cost;
(TIME_FOR_COMPARE_ROWID * M_LN2) +
get_sweep_read_cost(param, roru_total_records);
DBUG_PRINT("info", ("ROR-union: cost %g, %d members", roru_total_cost,
n_child_scans));
TRP_ROR_UNION* roru;
......@@ -1965,10 +2081,9 @@ TABLE_READ_PLAN *get_best_disjunct_quick(PARAM *param, SEL_IMERGE *imerge,
/*
Calculate cost of 'index only' scan for given index and number of records.
(We can resolve this by only reading through this key.)
SYNOPSIS
get_whole_index_read_time()
get_index_only_read_time()
param parameters structure
records #of records to read
keynr key to read
......@@ -1992,35 +2107,40 @@ inline double get_index_only_read_time(const PARAM* param, ha_rows records,
typedef struct st_ror_scan_info
{
uint idx; /* # of used key in param->keys */
uint keynr; /* # of used key in table */
ha_rows records;
SEL_ARG *sel_arg;
/* Fields used in the query and covered by this ROR scan */
uint idx; /* # of used key in param->keys */
uint keynr; /* # of used key in table */
ha_rows records; /* estimate of # records this scan will return */
/* Set of intervals over key fields that will be used for row retrieval. */
SEL_ARG *sel_arg;
/* Fields used in the query and covered by this ROR scan. */
MY_BITMAP covered_fields;
uint used_fields_covered;
int key_rec_length; /* length of key record with rowid */
uint used_fields_covered; /* # of set bits in covered_fields */
int key_rec_length; /* length of key record (including rowid) */
/*
Array of
#rows(keypart_1=c1 AND ... AND key_part_i=c_i) /
#rows(keypart_1=c1 AND ... AND key_part_{i+1}=c_{i+1}) values
*/
double *key_part_rows;
double index_read_cost;
uint first_uncovered_field;
uint key_components;
}ROR_SCAN_INFO;
Cost of reading all index records with values in sel_arg intervals set
(assuming there is no need to access full table records)
*/
double index_read_cost;
uint first_uncovered_field; /* first unused bit in covered_fields */
uint key_components; /* # of parts in the key */
} ROR_SCAN_INFO;
/*
Create ROR_SCAN_INFO* structure for condition sel_arg on key idx.
Create ROR_SCAN_INFO* structure with a single ROR scan on index idx using
sel_arg set of intervals.
SYNOPSIS
make_ror_scan()
param
idx index of key in param->keys
param Parameter from test_quick_select function
idx Index of key in param->keys
sel_arg Set of intervals for a given key
RETURN
NULL - OOM.
NULL - out of memory
ROR scan structure containing a scan for {idx, sel_arg}
*/
static
......@@ -2049,10 +2169,6 @@ ROR_SCAN_INFO *make_ror_scan(const PARAM *param, int idx, SEL_ARG *sel_arg)
param->fields_bitmap_size*8, false))
DBUG_RETURN(NULL);
bitmap_clear_all(&ror_scan->covered_fields);
if (!(ror_scan->key_part_rows=
(double*)alloc_root(param->mem_root, sizeof(double)*
param->table->key_info[keynr].key_parts)))
DBUG_RETURN(NULL);
KEY_PART_INFO *key_part= param->table->key_info[keynr].key_part;
KEY_PART_INFO *key_part_end= key_part +
......@@ -2069,50 +2185,23 @@ ROR_SCAN_INFO *make_ror_scan(const PARAM *param, int idx, SEL_ARG *sel_arg)
ror_scan->index_read_cost=
get_index_only_read_time(param, param->table->quick_rows[ror_scan->keynr],
ror_scan->keynr);
/*
Calculate # rows estimates for
(key_part1=c1)
(key_part1=c1 AND key_part2=c2)
...and so on
*/
char key_val[MAX_KEY_LENGTH+MAX_FIELD_WIDTH]; /* values of current key */
char *key_ptr= key_val;
ha_rows records;
ha_rows prev_records= param->table->file->records;
double *rows_diff= ror_scan->key_part_rows;
key_part= param->table->key_info[keynr].key_part;
SEL_ARG *arg= ror_scan->sel_arg;
/*
We have #rows estimate already for first key part, so do first loop
iteration separately:
*/
arg->store_min(key_part->length, &key_ptr, 0);
prev_records= param->table->quick_rows[ror_scan->keynr];
*(rows_diff++)= rows2double(prev_records) / param->table->file->records;
arg=arg->next_key_part;
for(; arg; ++key_part, arg= arg->next_key_part)
{
arg->store_min(key_part->length, &key_ptr, 0);
records=
param->table->file->records_in_range(ror_scan->keynr,
(byte*)key_val, key_ptr - key_val,
HA_READ_KEY_EXACT,
(byte*)key_val, key_ptr - key_val,
HA_READ_AFTER_KEY);
if (records == HA_POS_ERROR)
return NULL; /* shouldn't happen actually */
*(rows_diff++)= rows2double(records) / rows2double(prev_records);
prev_records= records;
}
DBUG_RETURN(ror_scan);
}
/*
Order ROR_SCAN_INFO** by
E(#records_matched) * key_record_length
/*
Compare two ROR_SCAN_INFO** by E(#records_matched) * key_record_length.
SYNOPSIS
cmp_ror_scan_info()
a ptr to first compared value
b ptr to second compared value
RETURN
-1 a < b
0 a = b
1 a > b
*/
int cmp_ror_scan_info(ROR_SCAN_INFO** a, ROR_SCAN_INFO** b)
static int cmp_ror_scan_info(ROR_SCAN_INFO** a, ROR_SCAN_INFO** b)
{
double val1= rows2double((*a)->records) * (*a)->key_rec_length;
double val2= rows2double((*b)->records) * (*b)->key_rec_length;
......@@ -2120,12 +2209,22 @@ int cmp_ror_scan_info(ROR_SCAN_INFO** a, ROR_SCAN_INFO** b)
}
/*
Order ROR_SCAN_INFO** by
Compare two ROR_SCAN_INFO** by
(#covered fields in F desc,
#components asc,
number of first not covered component asc)
SYNOPSIS
cmp_ror_scan_info_covering()
a ptr to first compared value
b ptr to second compared value
RETURN
-1 a < b
0 a = b
1 a > b
*/
int cmp_ror_scan_info_covering(ROR_SCAN_INFO** a, ROR_SCAN_INFO** b)
static int cmp_ror_scan_info_covering(ROR_SCAN_INFO** a, ROR_SCAN_INFO** b)
{
if ((*a)->used_fields_covered > (*b)->used_fields_covered)
return -1;
......@@ -2160,10 +2259,37 @@ typedef struct
*/
double records_fract;
ha_rows index_records; /* sum(#records to look in indexes) */
}ROR_INTERSECT_INFO;
} ROR_INTERSECT_INFO;
/* Allocate a ROR_INTERSECT and initialize it to contain zero scans */
/*
Re-initialize an allocated intersect info to contain zero scans.
SYNOPSIS
info Intersection info structure to re-initialize.
*/
static void ror_intersect_reinit(ROR_INTERSECT_INFO *info)
{
info->is_covering= false;
info->index_scan_costs= 0.0f;
info->records_fract= 1.0f;
bitmap_clear_all(&info->covered_fields);
}
/*
Allocate a ROR_INTERSECT_INFO and initialize it to contain zero scans.
SYNOPSIS
ror_intersect_init()
param Parameter from test_quick_select
is_index_only If true, set ROR_INTERSECT_INFO to be covering
RETURN
allocated structure
NULL on error
*/
static
ROR_INTERSECT_INFO* ror_intersect_init(const PARAM *param, bool is_index_only)
{
ROR_INTERSECT_INFO *info;
......@@ -2172,42 +2298,46 @@ ROR_INTERSECT_INFO* ror_intersect_init(const PARAM *param, bool is_index_only)
sizeof(ROR_INTERSECT_INFO))))
return NULL;
info->param= param;
info->is_covering= is_index_only;
info->index_scan_costs= 0.0f;
info->records_fract= 1.0f;
if (!(buf= (uchar*)alloc_root(param->mem_root, param->fields_bitmap_size)))
return NULL;
if (bitmap_init(&info->covered_fields, buf, param->fields_bitmap_size*8,
false))
return NULL;
bitmap_clear_all(&info->covered_fields);
ror_intersect_reinit(info);
return info;
}
/*
Check if it makes sense to add a ROR scan to ROR-intersection, and if yes
update parameters of ROR-intersection, including its cost.
Check if adding a ROR scan to a ROR-intersection reduces its cost of
ROR-intersection and if yes, update parameters of ROR-intersection,
including its cost.
RETURN
true ROR scan added to ROR-intersection, cost updated.
false It doesn't make sense to add this ROR scan to this ROR-intersection.
SYNOPSIS
ror_intersect_add()
param Parameter from test_quick_select
info ROR-intersection structure to add the scan to.
ror_scan ROR scan info to add.
is_cpk_scan If true, add the scan as CPK scan (this can be inferred
from other parameters and is passed separately only to
avoid duplicating the inference code)
NOTE
Adding a ROR scan to ROR-intersect "makes sense" iff selectivt
NOTES
Adding a ROR scan to ROR-intersect "makes sense" iff the cost of ROR-
intersection decreases. The cost of ROR-intersection is caclulated as
follows:
Cost of ROR-intersection is calulated as follows:
cost= SUM_i(key_scan_cost_i) + cost_of_full_rows_retrieval
cost= SUM_i(key_scan_cost_i) + cost_of_full_rows_retrieval
if (union of indexes used covers all needed fields)
cost_of_full_rows_retrieval= 0;
else
{
cost_of_full_rows_retrieval=
cost_of_sweep_read(E(rows_to_retrive), rows_in_table);
cost_of_sweep_read(E(rows_to_retrieve), rows_in_table);
}
E(rows_to_retrive) is calulated as follows:
E(rows_to_retrieve) is caclulated as follows:
Suppose we have a condition on several keys
cond=k_11=c_11 AND k_12=c_12 AND ... // parts of first key
k_21=c_21 AND k_22=c_22 AND ... // parts of second key
......@@ -2233,13 +2363,13 @@ ROR_INTERSECT_INFO* ror_intersect_init(const PARAM *param, bool is_index_only)
save R to be cond and proceed to recursion step.
Recursion step:
We have set of fixed fields/satisfied conditions) F, probability P(F),
We have a set of fixed fields/satisfied conditions) F, probability P(F),
and remaining conjunction R
Pick next key part on current key and its condition "k_ij=c_ij".
We will add "k_ij=c_ij" into F and update P(F).
Lets denote k_ij as t, R = t AND R1, where i1 may still contain t. Then
Lets denote k_ij as t, R = t AND R1, where R1 may still contain t. Then
P((t AND R1)|F) = P(t|F) * P(R1|t|F) = P(t|F) * P(R|(t AND F)) (2)
P((t AND R1)|F) = P(t|F) * P(R1|t|F) = P(t|F) * P(R1|(t AND F)) (2)
(where '|' mean conditional probability, not "or")
......@@ -2253,72 +2383,153 @@ ROR_INTERSECT_INFO* ror_intersect_init(const PARAM *param, bool is_index_only)
P(t|F) = P(t|(fields_before_t_in_key AND other_fields)) =
= P(t|fields_before_t_in_key).
P(t|fields_before_t_in_key)= #distinct_values(fields_before_t_in_key) /
#distinct_values(fields_before_t_in_key, t)
P(t|fields_before_t_in_key) = #records(fields_before_t_in_key) /
#records(fields_before_t_in_key, t)
The second multiplier is calculated by applying this step recusively.
The second multiplier is calculated by applying this step recursively.
This function applies recursion steps for all fixed key members of
one key, accumulating sets of covered fields and
The very first step described is done as recursion step with
P(fixed fields)=1 and empty set of fixed fields.
IMPLEMENTATION
This function calculates the result of application of the "recursion step"
described above for all fixed key members of a single key, accumulating set
of covered fields, selectivity, etc.
The calculation is conducted as follows:
Lets denote #records(keypart1, ... keypartK) as n_k. We need to calculate
n_{k1} n_{k_2}
--------- * --------- * .... (3)
n_{k1-1} n_{k2_1}
where k1,k2,... are key parts which fields were not yet marked as fixed
( this is result of application of option b) of the recursion step for
parts of a single key).
Since it is reasonable to expect that most of the fields are not marked
as fixed, we calcualate (3) as
n_{i1} n_{i_2}
(3) = n_{max_key_part} / ( --------- * --------- * .... )
n_{i1-1} n_{i2_1}
where i1,i2, .. are key parts that were already marked as fixed.
In order to minimize number of expensive records_in_range calls we group
and reduce adjacent fractions.
RETURN
true ROR scan added to ROR-intersection, cost updated.
false It doesn't make sense to add this ROR scan to this ROR-intersection.
*/
bool ror_intersect_add(ROR_INTERSECT_INFO *info, ROR_SCAN_INFO* ror_scan)
bool ror_intersect_add(const PARAM *param, ROR_INTERSECT_INFO *info,
ROR_SCAN_INFO* ror_scan, bool is_cpk_scan=false)
{
int i;
SEL_ARG *sel_arg;
KEY_PART_INFO *key_part=
info->param->table->key_info[ror_scan->keynr].key_part;
double selectivity_mult= 1.0;
char key_val[MAX_KEY_LENGTH+MAX_FIELD_WIDTH]; /* key values tuple */
DBUG_ENTER("ror_intersect_add");
DBUG_PRINT("info", ("Current selectivity= %g", info->records_fract));
DBUG_PRINT("info", ("Adding scan on %s",
info->param->table->key_info[ror_scan->keynr].name));
SEL_ARG *tuple_arg= NULL;
char *key_ptr= key_val;
bool cur_covered, prev_covered=
bitmap_is_set(&info->covered_fields, key_part->fieldnr);
ha_rows prev_records= param->table->file->records;
for(i= 0, sel_arg= ror_scan->sel_arg; sel_arg;
i++, sel_arg= sel_arg->next_key_part)
{
if (!bitmap_is_set(&info->covered_fields, (key_part + i)->fieldnr))
cur_covered= bitmap_is_set(&info->covered_fields, (key_part + i)->fieldnr);
if (cur_covered != prev_covered)
{
/*
P(t|F) = P(t|(fields_before_t_in_key AND other_fields)) =
= P(t|fields_before_t_in_key).
*/
selectivity_mult *= ror_scan->key_part_rows[i];
/* create (part1val, ..., part{n-1}val) tuple. */
{
if (!tuple_arg)
{
tuple_arg= ror_scan->sel_arg;
tuple_arg->store_min(key_part->length, &key_ptr, 0);
}
while (tuple_arg->next_key_part != sel_arg)
{
tuple_arg= tuple_arg->next_key_part;
tuple_arg->store_min(key_part->length, &key_ptr, 0);
}
}
ha_rows records;
records= param->table->file->
records_in_range(ror_scan->keynr,
(byte*)key_val, key_ptr - key_val,
HA_READ_KEY_EXACT,
(byte*)key_val, key_ptr - key_val,
HA_READ_AFTER_KEY);
if (cur_covered)
{
/* uncovered -> covered */
double tmp= rows2double(records)/rows2double(prev_records);
printf(" Selectivity multiplier: %g\n", tmp);
DBUG_PRINT("info", ("Selectivity multiplier: %g", tmp));
selectivity_mult *= tmp;
prev_records= HA_POS_ERROR;
}
else
{
/* covered -> uncovered */
prev_records= records;
}
}
else printf("no change, skipping\n");
prev_covered= cur_covered;
}
if (!prev_covered)
{
double tmp= rows2double(param->table->quick_rows[ror_scan->keynr]) /
rows2double(prev_records);
DBUG_PRINT("info", ("Selectivity multiplier: %g", tmp));
selectivity_mult *= tmp;
}
if (selectivity_mult == 1.0)
{
/* Don't add this scan if it doesn't improve selectivity. */
DBUG_PRINT("info", ("This scan doesn't improve selectivity."));
DBUG_PRINT("info", ("The scan doesn't improve selectivity."));
DBUG_RETURN(false);
}
info->records_fract *= selectivity_mult;
bitmap_union(&info->covered_fields, &ror_scan->covered_fields);
ha_rows scan_records= info->param->table->quick_rows[ror_scan->keynr];
info->index_scan_costs += ror_scan->index_read_cost;
info->records_fract *= selectivity_mult;
ha_rows cur_scan_records= info->param->table->quick_rows[ror_scan->keynr];
if (is_cpk_scan)
{
info->index_scan_costs += rows2double(cur_scan_records)*
TIME_FOR_COMPARE_ROWID;
}
else
{
info->index_records += cur_scan_records;
info->index_scan_costs += ror_scan->index_read_cost;
bitmap_union(&info->covered_fields, &ror_scan->covered_fields);
}
if (!info->is_covering && bitmap_is_subset(&info->param->needed_fields,
&info->covered_fields))
{
DBUG_PRINT("info", ("ROR-intersect is covering now"));
/* ROR-intersect became covering */
info->is_covering= true;
}
info->index_records += scan_records;
printf(" records: %g\n", rows2double(param->table->file->records) *
info->records_fract);
info->total_cost= info->index_scan_costs;
if (!info->is_covering)
{
ha_rows table_recs= info->param->table->file->records;
double sweep_cost;
get_sweep_read_cost(info->param,
(ha_rows)(table_recs*info->records_fract),
&sweep_cost, info->index_scan_costs, DBL_MAX);
info->total_cost += sweep_cost;
info->total_cost +=
get_sweep_read_cost(info->param,
(ha_rows)(info->records_fract*table_recs));
}
DBUG_PRINT("info", ("New selectivity= %g", info->records_fract));
DBUG_PRINT("info", ("New cost= %g, %scovering", info->total_cost,
......@@ -2326,24 +2537,23 @@ bool ror_intersect_add(ROR_INTERSECT_INFO *info, ROR_SCAN_INFO* ror_scan)
DBUG_RETURN(true);
}
/*
Get best ROR-intersection plan using non-covering ROR-intersection search
algorithm. The returned plan may be covering.
SYNOPSIS
get_best_ror_intersect()
param
tree
param Parameter from test_quick_select function.
tree Transformed restriction condition to be used to look
for ROR scans.
force_index_only If true, don't calculate costs of full rows retrieval.
read_time Do not return read plans with cost > read_time.
are_all_covering [out] set to true if union of all scans covers all
fields needed by the query (and it is possible to build
a covering ROR-intersection)
RETURN
ROR-intersection table read plan
NULL if OOM or no plan found.
NOTE
NOTES
get_key_scans_params must be called before for the same SEL_TREE before
this function can be called.
......@@ -2383,6 +2593,10 @@ bool ror_intersect_add(ROR_INTERSECT_INFO *info, ROR_SCAN_INFO* ror_scan)
Clustered PK scan has special handling in ROR-intersection: it is not used
to retrieve rows, instead its condition is used to filter row references
we get from scans on other keys.
RETURN
ROR-intersection table read plan
NULL if out of memory or no suitable plan found.
*/
static
......@@ -2398,20 +2612,34 @@ TRP_ROR_INTERSECT *get_best_ror_intersect(const PARAM *param, SEL_TREE *tree,
if (tree->n_ror_scans < 2)
DBUG_RETURN(NULL);
/* Collect ROR-able SEL_ARGs and create ROR_SCAN_INFO for each of them */
/*
Collect ROR-able SEL_ARGs and create ROR_SCAN_INFO for each of them.
Also find and save clustered PK scan if there is one.
*/
ROR_SCAN_INFO **cur_ror_scan;
ROR_SCAN_INFO *cpk_scan= NULL;
bool cpk_scan_used= false;
if (!(tree->ror_scans= (ROR_SCAN_INFO**)alloc_root(param->mem_root,
sizeof(ROR_SCAN_INFO*)*
param->keys)))
return NULL;
uint cpk_no= (param->table->file->primary_key_is_clustered())?
param->table->primary_key : MAX_KEY;
for (idx= 0, cur_ror_scan= tree->ror_scans; idx < param->keys; idx++)
{
ROR_SCAN_INFO *scan;
if (!tree->ror_scans_map.is_set(idx))
continue;
if (!(*cur_ror_scan= make_ror_scan(param, idx, tree->keys[idx])))
if (!(scan= make_ror_scan(param, idx, tree->keys[idx])))
return NULL;
cur_ror_scan++;
if (param->real_keynr[idx] == cpk_no)
{
cpk_scan= scan;
tree->n_ror_scans--;
}
else
*(cur_ror_scan++)= scan;
}
tree->ror_scans_end= cur_ror_scan;
......@@ -2421,7 +2649,7 @@ TRP_ROR_INTERSECT *get_best_ror_intersect(const PARAM *param, SEL_TREE *tree,
/*
Ok, [ror_scans, ror_scans_end) is array of ptrs to initialized
ROR_SCAN_INFOs.
Get a minimal key scan using an approximate algorithm.
Now, get a minimal key scan using an approximate algorithm.
*/
qsort(tree->ror_scans, tree->n_ror_scans, sizeof(ROR_SCAN_INFO*),
(qsort_cmp)cmp_ror_scan_info);
......@@ -2452,12 +2680,14 @@ TRP_ROR_INTERSECT *get_best_ror_intersect(const PARAM *param, SEL_TREE *tree,
LINT_INIT(best_index_scan_costs);
cur_ror_scan= tree->ror_scans;
/* Start with one scan */
intersect_scans_best= intersect_scans;
while (cur_ror_scan != tree->ror_scans_end && !intersect->is_covering)
{
/* S= S + first(R); */
if (ror_intersect_add(intersect, *cur_ror_scan))
if (ror_intersect_add(param, intersect, *cur_ror_scan))
*(intersect_scans_end++)= *cur_ror_scan;
/* R= R-first(R); */
/* R= R - first(R); */
cur_ror_scan++;
if (intersect->total_cost < min_cost)
......@@ -2471,17 +2701,47 @@ TRP_ROR_INTERSECT *get_best_ror_intersect(const PARAM *param, SEL_TREE *tree,
best_index_scan_costs= intersect->index_scan_costs;
}
}
/* Ok, return ROR-intersect plan if we have found one */
DBUG_EXECUTE("info",print_ror_scans_arr(param->table,
"best ROR-intersection",
intersect_scans,
intersect_scans_best););
*are_all_covering= intersect->is_covering;
uint best_num= intersect_scans_best - intersect_scans;
/*
Ok, found the best ROR-intersection of non-CPK key scans.
Check if we should add a CPK scan.
If the obtained ROR-intersection is covering, it doesn't make sense
to add CPK scan - Clustered PK contains all fields and if we're doing
CPK scan doing other CPK scans will only add more overhead.
*/
if (cpk_scan && !intersect->is_covering)
{
/*
Handle the special case: ROR-intersect(PRIMARY, key1) is
the best, but cost(range(key1)) > cost(best_non_ror_range_scan)
*/
if (best_num == 0)
{
ror_intersect_reinit(intersect);
if (!ror_intersect_add(param, intersect, cpk_scan))
DBUG_RETURN(NULL); /* shouldn't happen actually actually */
*(intersect_scans_end++)= *cur_ror_scan;
best_num++;
}
if (ror_intersect_add(param, intersect, cpk_scan))
cpk_scan_used= true;
best_rows= (ha_rows)(intersect->records_fract*
rows2double(param->table->file->records));
}
/* Ok, return ROR-intersect plan if we have found one */
TRP_ROR_INTERSECT *trp= NULL;
if (intersect_scans_best && best_num > 1)
if (best_num > 1 || cpk_scan_used)
{
DBUG_EXECUTE("info",print_ror_scans_arr(param->table,
"used for ROR-intersect",
intersect_scans,
intersect_scans_best););
if (!(trp= new (param->mem_root) TRP_ROR_INTERSECT))
DBUG_RETURN(trp);
if (!(trp->first_scan=
......@@ -2494,7 +2754,8 @@ TRP_ROR_INTERSECT *get_best_ror_intersect(const PARAM *param, SEL_TREE *tree,
trp->read_cost= min_cost;
trp->records= best_rows? best_rows : 1;
trp->index_scan_costs= best_index_scan_costs;
}
trp->cpk_scan= cpk_scan;
}
DBUG_RETURN(trp);
}
......@@ -2503,15 +2764,15 @@ TRP_ROR_INTERSECT *get_best_ror_intersect(const PARAM *param, SEL_TREE *tree,
Get best covering ROR-intersection.
SYNOPSIS
get_best_covering_ror_intersect()
param
tree SEL_TREE
read_time Dont return table read plans with cost > read_time.
param Parameter from test_quick_select function.
tree SEL_TREE with sets of intervals for different keys.
read_time Don't return table read plans with cost > read_time.
RETURN
Best covering ROR-intersection plan
NULL if no plan found.
NOTE
NOTES
get_best_ror_intersect must be called for a tree before calling this
function for it.
This function invalidates tree->ror_scans member values.
......@@ -2563,7 +2824,6 @@ TRP_ROR_INTERSECT *get_best_covering_ror_intersect(PARAM *param,
ha_rows records=0;
bool all_covered;
/* Start will all scans and remove one by one until */
DBUG_PRINT("info", ("Building covering ROR-intersection"));
DBUG_EXECUTE("info", print_ror_scans_arr(param->table,
"building covering ROR-I",
......@@ -2805,12 +3065,23 @@ QUICK_SELECT_I *TRP_ROR_INTERSECT::make_quick(PARAM *param,
DBUG_RETURN(NULL);
}
}
if (cpk_scan)
{
if (!(quick= get_quick_select(param, cpk_scan->idx,
cpk_scan->sel_arg, alloc)))
{
delete quick_intrsect;
DBUG_RETURN(NULL);
}
quick_intrsect->cpk_quick= quick;
}
quick_intrsect->records= records;
quick_intrsect->read_time= read_cost;
}
DBUG_RETURN(quick_intrsect);
}
QUICK_SELECT_I *TRP_ROR_UNION::make_quick(PARAM *param,
bool retrieve_full_rows,
MEM_ROOT *parent_alloc)
......@@ -2820,8 +3091,8 @@ QUICK_SELECT_I *TRP_ROR_UNION::make_quick(PARAM *param,
QUICK_SELECT_I *quick;
DBUG_ENTER("TRP_ROR_UNION::make_quick");
/*
It is currently impossible to construct a ROR-union that will
not retrieve full rows, ingore retrieve_full_rows.
It is impossible to construct a ROR-union that will not retrieve full
rows, ignore retrieve_full_rows parameter.
*/
if ((quick_roru= new QUICK_ROR_UNION_SELECT(param->thd, param->table)))
{
......@@ -4248,7 +4519,7 @@ SEL_ARG *rb_delete_fixup(SEL_ARG *root,SEL_ARG *key,SEL_ARG *par)
}
/* Test that the proporties for a red-black tree holds */
/* Test that the properties for a red-black tree hold */
#ifdef EXTRA_DEBUG
int test_rb_tree(SEL_ARG *element,SEL_ARG *parent)
......@@ -4336,13 +4607,26 @@ void SEL_ARG::test_use_count(SEL_ARG *root)
#endif
/*
Calculate estimate of number records that will be retrieved by a range
scan on given index using given SEL_ARG intervals tree.
SYNOPSIS
check_quick_select
param Parameter from test_quick_select
idx Number of index to use in PARAM::key SEL_TREE::key
tree Transformed selection condition, tree->key[idx] holds intervals
tree to be used for scanning.
NOTES
param->is_ror_scan is set to reflect if the key scan is a ROR (see
is_key_scan_ror function for more info)
param->table->quick_*, param->range_count (and maybe others) are
updated with data of given key scan, see check_quick_keys for details.
RETURN
Estimate # of records to be retrieved.
HA_POS_ERROR if estimate calculation failed due to table handler problems.
/*****************************************************************************
** Check how many records we will find by using the found tree
** NOTE
** param->table->quick_* and param->range_count (and maybe others) are
** updated with data of given key scan.
*****************************************************************************/
*/
static ha_rows
check_quick_select(PARAM *param,uint idx,SEL_ARG *tree)
......@@ -4396,30 +4680,40 @@ check_quick_select(PARAM *param,uint idx,SEL_ARG *tree)
}
/*
/*
Recursively calculate estimate of # rows that will be retrieved by
key scan on key idx.
SYNOPSIS
check_quick_keys()
param
idx key to use, its number in list of used keys (that is,
param->real_keynr[idx] holds the key number in table)
key_tree SEL_ARG tree which cost is calculated.
min_key buffer with min key value tuple
min_key_flag
max_key buffer with max key value tuple
param Parameter from test_quick select function.
idx Number of key to use in PARAM::keys in list of used keys
(param->real_keynr[idx] holds the key number in table)
key_tree SEL_ARG tree being examined.
min_key Buffer with partial min key value tuple
min_key_flag
max_key Buffer with partial max key value tuple
max_key_flag
NOTE
The function does the recursive descent on the tree via left, right, and
next_key_part edges. The #rows estimates are calculated at the leaf nodes.
NOTES
The function does the recursive descent on the tree via SEL_ARG::left,
SEL_ARG::right, and SEL_ARG::next_key_part edges. The #rows estimates
are calculated using records_in_range calls at the leaf nodes and then
summed.
param->min_key and param->max_key are used to hold key segment values.
param->min_key and param->max_key are used to hold prefixes of key value
tuples.
The side effects are:
param->max_key_part is updated to hold the maximum number of key parts used
in scan minus 1.
param->range_count is updated.
param->is_ror_scan is updated.
param->range_count is incremented if the function finds a range that
wasn't counted by the caller.
param->is_ror_scan is cleared if the function detects that the key scan is
not a Rowid-Ordered Retrieval scan ( see comments for is_key_scan_ror
function for description of which key scans are ROR scans)
*/
static ha_rows
......@@ -4432,6 +4726,12 @@ check_quick_keys(PARAM *param,uint idx,SEL_ARG *key_tree,
param->max_key_part=max(param->max_key_part,key_tree->part);
if (key_tree->left != &null_element)
{
/*
There are at least two intervals for current key part, i.e. condition
was converted to something like
(keyXpartY less/equals c1) OR (keyXpartY more/equals c2).
This is not a ROR scan if the key is not Clustered Primary Key.
*/
param->is_ror_scan= false;
records=check_quick_keys(param,idx,key_tree->left,min_key,min_key_flag,
max_key,max_key_flag);
......@@ -4441,12 +4741,25 @@ check_quick_keys(PARAM *param,uint idx,SEL_ARG *key_tree,
uint tmp_min_flag,tmp_max_flag,keynr;
char *tmp_min_key=min_key,*tmp_max_key=max_key;
key_tree->store(param->key[idx][key_tree->part].part_length,
&tmp_min_key,min_key_flag,&tmp_max_key,max_key_flag);
uint min_key_length= (uint) (tmp_min_key- param->min_key);
uint max_key_length= (uint) (tmp_max_key- param->max_key);
if (param->is_ror_scan)
{
/*
If the index doesn't cover entire key, mark the scan as non-ROR scan.
(TODO sergeyp: investigate if we could do better here)
*/
uint16 fieldnr= param->table->key_info[param->real_keynr[idx]].
key_part[key_tree->part].fieldnr - 1;
if (param->table->field[fieldnr]->key_length() !=
param->key[idx][key_tree->part].part_length)
param->is_ror_scan= false;
}
if (key_tree->next_key_part &&
key_tree->next_key_part->part == key_tree->part+1 &&
key_tree->next_key_part->type == SEL_ARG::KEY_RANGE)
......@@ -4461,7 +4774,10 @@ check_quick_keys(PARAM *param,uint idx,SEL_ARG *key_tree,
goto end; // Ugly, but efficient
}
else
{
/* The interval for current key part is not c1 <= keyXpartY <= c1 */
param->is_ror_scan= false;
}
tmp_min_flag=key_tree->min_flag;
tmp_max_flag=key_tree->max_flag;
......@@ -4493,6 +4809,15 @@ check_quick_keys(PARAM *param,uint idx,SEL_ARG *key_tree,
{
if (param->is_ror_scan)
{
/*
If we get here, the condition on the key was converted to form
"(keyXpart1 = c1) AND ... AND (keyXpart{key_tree->part - 1} = cN) AND
somecond(keyXpart{key_tree->part})"
Check if
somecond is "keyXpart{key_tree->part} = const" and
uncovered "tail" of KeyX parts is either empty or is identical to
first members of clustered primary key.
*/
if (!(min_key_length == max_key_length &&
!memcmp(min_key,max_key, (uint) (tmp_max_key - max_key)) &&
!key_tree->min_flag && !key_tree->max_flag &&
......@@ -4530,6 +4855,12 @@ check_quick_keys(PARAM *param,uint idx,SEL_ARG *key_tree,
records+=tmp;
if (key_tree->right != &null_element)
{
/*
There are at least two intervals for current key part, i.e. condition
was converted to something like
(keyXpartY less/equals c1) OR (keyXpartY more/equals c2).
This is not a ROR scan if the key is not Clustered Primary Key.
*/
param->is_ror_scan= false;
tmp=check_quick_keys(param,idx,key_tree->right,min_key,min_key_flag,
max_key,max_key_flag);
......@@ -4540,11 +4871,46 @@ check_quick_keys(PARAM *param,uint idx,SEL_ARG *key_tree,
return records;
}
/*
Check if key scan on key keynr with first nparts key parts fixed is a
ROR scan. This function doesn't handle clustered PK scans or HASH index
scans.
Check if key scan on given index with equality conditions on first n key
parts is a ROR scan.
SYNOPSIS
is_key_scan_ror()
param Parameter from test_quick_select
keynr Number of key in the table. The key must not be a clustered
primary key.
nparts Number of first key parts for which equality conditions
are present.
NOTES
ROR (Rowid Ordered Retrieval) key scan is a key scan that produces
ordered sequence of rowids (ha_xxx::cmp_ref is the comparison function)
An index scan is a ROR scan if it is done using a condition in form
"key1_1=c_1 AND ... AND key1_n=c_n" (1)
where the index is defined on (key1_1, ..., key1_N [,a_1, ..., a_n])
and the table has a clustered Primary Key
PRIMARY KEY(a_1, ..., a_n, b1, ..., b_k) with first key parts being
identical to uncovered parts ot the key being scanned (2)
Scans on HASH indexes are not ROR scans,
any range scan on clustered primary key is ROR scan (3)
Check (1) is made in check_quick_keys()
Check (3) is made check_quick_select()
Check (2) is made by this function.
RETURN
true If the scan is ROR-scan
false otherwise
*/
static bool is_key_scan_ror(PARAM *param, uint keynr, uint8 nparts)
{
KEY *table_key= param->table->key_info + keynr;
......@@ -4564,7 +4930,8 @@ static bool is_key_scan_ror(PARAM *param, uint keynr, uint8 nparts)
for(;(key_part!=key_part_end) && (pk_part != pk_part_end);
++key_part, ++pk_part)
{
if (key_part->field != pk_part->field)
if ((key_part->field != pk_part->field) ||
(key_part->length != pk_part->length))
return false;
}
return (key_part == key_part_end);
......@@ -4573,17 +4940,26 @@ static bool is_key_scan_ror(PARAM *param, uint keynr, uint8 nparts)
/*
Create a QUICK_RANGE_SELECT from given key and SEL_ARG tree for that key.
This uses it's own malloc tree.
SYNOPSIS
get_quick_select()
param
idx index of used key in param->key.
idx Index of used key in param->key.
key_tree SEL_ARG tree for the used key
parent_alloc if not NULL, use it to allocate memory for
parent_alloc If not NULL, use it to allocate memory for
quick select data. Otherwise use quick->alloc.
RETURN
NULL on error
otherwise created quick select
NOTES
The caller must call QUICK_SELCT::init for returned quick select
The caller should call QUICK_SELCT::init for returned quick select
CAUTION! This function may change THR_MALLOC to a MEM_ROOT which will be
deallocated when the returned quick select is deleted.
*/
QUICK_RANGE_SELECT *
get_quick_select(PARAM *param,uint idx,SEL_ARG *key_tree,
MEM_ROOT *parent_alloc)
......@@ -5008,15 +5384,23 @@ int QUICK_INDEX_MERGE_SELECT::get_next()
/*
Retrieve next record.
SYNOPSIS
QUICK_ROR_INTERSECT_SELECT::get_next()
NOTES
Invariant on enter/exit: all intersected selects have retrieved index
records with rowid <= some_rowid_val and no intersected select has
Invariant on enter/exit: all intersected selects have retrieved all index
records with rowid <= some_rowid_val and no intersected select has
retrieved any index records with rowid > some_rowid_val.
We start fresh and loop until we have retrieved the same rowid in each of
the key scans or we got an error.
If a Clustered PK scan is present, it is used only to check if row
satisfies its conditions (and never used for row retrieval).
satisfies its condition (and never used for row retrieval).
RETURN
0 - Ok
other - Error code if any error occurred.
*/
int QUICK_ROR_INTERSECT_SELECT::get_next()
......@@ -5090,10 +5474,18 @@ int QUICK_ROR_INTERSECT_SELECT::get_next()
/*
Retrieve next record.
SYNOPSIS
QUICK_ROR_UNION_SELECT::get_next()
NOTES
Enter/exit invariant:
For each quick select in the queue a {key,rowid} tuple has been
retrieved but the corresponding row hasn't been passed to output.
RETURN
0 - Ok
other - Error code if any error occurred.
*/
int QUICK_ROR_UNION_SELECT::get_next()
......@@ -5107,7 +5499,7 @@ int QUICK_ROR_UNION_SELECT::get_next()
{
if (!queue.elements)
DBUG_RETURN(HA_ERR_END_OF_FILE);
/* Ok, we have a queue with > 1 scans */
/* Ok, we have a queue with >= 1 scans */
quick= (QUICK_SELECT_I*)queue_top(&queue);
memcpy(cur_rowid, quick->last_rowid, rowid_length);
......@@ -5548,8 +5940,78 @@ bool QUICK_SELECT_DESC::test_if_null_range(QUICK_RANGE *range_arg,
#endif
void QUICK_RANGE_SELECT::fill_keys_and_lengths(String *key_names,
String *used_lengths)
void QUICK_RANGE_SELECT::add_info_string(String *str)
{
KEY *key_info= head->key_info + index;
str->append(key_info->name);
}
void QUICK_INDEX_MERGE_SELECT::add_info_string(String *str)
{
QUICK_RANGE_SELECT *quick;
bool first= true;
List_iterator_fast<QUICK_RANGE_SELECT> it(quick_selects);
str->append("sort_union(");
while ((quick= it++))
{
if (!first)
str->append(',');
else
first= false;
quick->add_info_string(str);
}
if (pk_quick_select)
{
str->append(',');
pk_quick_select->add_info_string(str);
}
str->append(')');
}
void QUICK_ROR_INTERSECT_SELECT::add_info_string(String *str)
{
bool first= true;
QUICK_RANGE_SELECT *quick;
List_iterator_fast<QUICK_RANGE_SELECT> it(quick_selects);
str->append("intersect(");
while ((quick= it++))
{
KEY *key_info= head->key_info + quick->index;
if (!first)
str->append(',');
else
first= false;
str->append(key_info->name);
}
if (cpk_quick)
{
KEY *key_info= head->key_info + cpk_quick->index;
str->append(',');
str->append(key_info->name);
}
str->append(')');
}
void QUICK_ROR_UNION_SELECT::add_info_string(String *str)
{
bool first= true;
QUICK_SELECT_I *quick;
List_iterator_fast<QUICK_SELECT_I> it(quick_selects);
str->append("union(");
while ((quick= it++))
{
if (!first)
str->append(',');
else
first= false;
quick->add_info_string(str);
}
str->append(')');
}
void QUICK_RANGE_SELECT::add_keys_and_lengths(String *key_names,
String *used_lengths)
{
char buf[64];
uint length;
......@@ -5559,22 +6021,27 @@ void QUICK_RANGE_SELECT::fill_keys_and_lengths(String *key_names,
used_lengths->append(buf, length);
}
void QUICK_INDEX_MERGE_SELECT::fill_keys_and_lengths(String *key_names,
String *used_lengths)
void QUICK_INDEX_MERGE_SELECT::add_keys_and_lengths(String *key_names,
String *used_lengths)
{
char buf[64];
uint length;
bool first= true;
QUICK_RANGE_SELECT *quick;
List_iterator_fast<QUICK_RANGE_SELECT> it(quick_selects);
while ((quick= it++))
{
KEY *key_info= head->key_info + quick->index;
if (key_names->length())
if (first)
first= false;
else
{
key_names->append(',');
key_names->append(key_info->name);
if (used_lengths->length())
used_lengths->append(',');
}
KEY *key_info= head->key_info + quick->index;
key_names->append(key_info->name);
length= longlong2str(quick->max_used_key_length, buf, 10) - buf;
used_lengths->append(buf, length);
}
......@@ -5589,8 +6056,8 @@ void QUICK_INDEX_MERGE_SELECT::fill_keys_and_lengths(String *key_names,
}
}
void QUICK_ROR_INTERSECT_SELECT::fill_keys_and_lengths(String *key_names,
String *used_lengths)
void QUICK_ROR_INTERSECT_SELECT::add_keys_and_lengths(String *key_names,
String *used_lengths)
{
char buf[64];
uint length;
......@@ -5600,17 +6067,18 @@ void QUICK_ROR_INTERSECT_SELECT::fill_keys_and_lengths(String *key_names,
while ((quick= it++))
{
KEY *key_info= head->key_info + quick->index;
if (!first)
key_names->append(',');
key_names->append(key_info->name);
if (first)
first= false;
else
{
key_names->append(',');
used_lengths->append(',');
}
key_names->append(key_info->name);
length= longlong2str(quick->max_used_key_length, buf, 10) - buf;
used_lengths->append(buf, length);
}
if (cpk_quick)
{
KEY *key_info= head->key_info + cpk_quick->index;
......@@ -5622,8 +6090,8 @@ void QUICK_ROR_INTERSECT_SELECT::fill_keys_and_lengths(String *key_names,
}
}
void QUICK_ROR_UNION_SELECT::fill_keys_and_lengths(String *key_names,
String *used_lengths)
void QUICK_ROR_UNION_SELECT::add_keys_and_lengths(String *key_names,
String *used_lengths)
{
bool first= true;
QUICK_SELECT_I *quick;
......@@ -5637,7 +6105,7 @@ void QUICK_ROR_UNION_SELECT::fill_keys_and_lengths(String *key_names,
used_lengths->append(',');
key_names->append(',');
}
quick->fill_keys_and_lengths(key_names, used_lengths);
quick->add_keys_and_lengths(key_names, used_lengths);
}
}
......@@ -5850,7 +6318,7 @@ void QUICK_ROR_UNION_SELECT::dbug_dump(int indent, bool verbose)
#endif
/*****************************************************************************
** Instansiate templates
** Instantiate templates
*****************************************************************************/
#ifdef __GNUC__
......
sql/opt_range.h
View file @ dff98a8e
......@@ -77,27 +77,59 @@ class QUICK_SELECT_I
ha_rows records; /* estimate of # of records to be retrieved */
double read_time; /* time to perform this retrieval */
TABLE *head;
/*
index this quick select uses, or MAX_KEY for quick selects
Index this quick select uses, or MAX_KEY for quick selects
that use several indexes
*/
uint index;
/* applicable iff index!= MAX_KEY */
uint max_used_key_length, used_key_parts;
/*
Total length of first used_key_parts parts of the key.
Applicable if index!= MAX_KEY.
*/
uint max_used_key_length;
/*
Max. number of (first) key parts this quick select uses for retrieval.
eg. for "(key1p1=c1 AND key1p2=c2) OR key1p1=c2" used_key_parts == 2.
Applicable if index!= MAX_KEY.
*/
uint used_key_parts;
QUICK_SELECT_I();
virtual ~QUICK_SELECT_I(){};
/*
Call init() immediately after creation of quick select. if init() call
fails, reset() or get_next() must not be called.
/*
Do post-constructor initialization.
SYNOPSIS
init()
init() performs initializations that should have been in constructor if
it was possible to return errors from constructors. The join optimizer may
create and then delete quick selects without retrieving any rows so init()
must not contain any IO or CPU intensive code.
If init() call fails the only valid action is to delete this quick select,
reset() and get_next() must not be called.
RETURN
0 OK
other Error code
*/
virtual int init() = 0;
/*
Call reset() before first get_next call. get_next must not be called if
reset() call fails.
Initialize quick select for row retrieval.
SYNOPSIS
reset()
reset() should be called when it is certain that row retrieval will be
necessary. This call may do heavyweight initialization like buffering first
N records etc. If reset() call fails get_next() must not be called.
RETURN
0 OK
other Error code
*/
virtual int reset(void) = 0;
virtual int get_next() = 0; /* get next record to retrieve */
......@@ -117,30 +149,54 @@ class QUICK_SELECT_I
virtual int get_type() = 0;
/*
Initialize this quick select as a child of a index union or intersection
scan. This call replaces init() call.
Initialize this quick select as a merged scan inside a ROR-union or a ROR-
intersection scan. The caller must not additionally call init() if this
function is called.
SYNOPSIS
init_ror_merged_scan()
reuse_handler quick select may use (q: psergey??)
(q: is this natural that we do it this way)
NOTES
psergey?
*/
virtual int init_ror_child_scan(bool reuse_handler)
virtual int init_ror_merged_scan(bool reuse_handler)
{ DBUG_ASSERT(0); return 1; }
virtual void cleanup_ror_child_scan() { DBUG_ASSERT(0); }
/* Save ROWID of last retrieved row in file->ref. (psergey: or table->ref?) */
virtual void save_last_pos(){};
/*
Fill key_names with list of keys this quick select used;
fill used_lenghth with correponding used lengths.
Append comma-separated list of keys this quick select uses to key_names;
append comma-separated list of corresponding used lengths to used_lengths.
This is used by select_describe.
*/
virtual void fill_keys_and_lengths(String *key_names,
String *used_lengths)=0;
virtual void add_keys_and_lengths(String *key_names,
String *used_lengths)=0;
/*
Append text representation of quick select structure (what and how is
merged) to str. The result is added to "Extra" field in EXPLAIN output.
This function is implemented only by quick selects that merge other quick
selects output and/or can produce output suitable for merging.
*/
virtual void add_info_string(String *str) {};
/*
Return 1 if any index used by this quick select
a) uses field that is listed in passed field list or
b) is automatically updated (like a timestamp)
*/
virtual bool check_if_keys_used(List<Item> *fields);
/*
rowid of last row retrieved by this quick select. This is used only
when doing ROR-index_merge selects
rowid of last row retrieved by this quick select. This is used only when
doing ROR-index_merge selects
*/
byte *last_rowid;
/*
Table record buffer used by this quick select.
Currently this is always the same as head->record[0]. psergey: check that!
*/
byte *record;
#ifndef DBUG_OFF
/*
......@@ -155,6 +211,10 @@ class QUICK_SELECT_I
struct st_qsel_param;
class SEL_ARG;
/*
Quick select that does a range scan on a single key. The records are
returned in key order.
*/
class QUICK_RANGE_SELECT : public QUICK_SELECT_I
{
protected:
......@@ -163,7 +223,11 @@ class QUICK_RANGE_SELECT : public QUICK_SELECT_I
int error;
protected:
handler *file;
bool free_file; /* if true, this quick select "owns" file and will free it */
/*
If true, this quick select has its "own" handler object which should be
closed no later then this quick select is deleted.
*/
bool free_file;
protected:
friend
......@@ -207,15 +271,16 @@ class QUICK_RANGE_SELECT : public QUICK_SELECT_I
int get_next();
bool reverse_sorted() { return 0; }
bool unique_key_range();
int init_ror_child_scan(bool reuse_handler);
int init_ror_merged_scan(bool reuse_handler);
void save_last_pos()
{
file->position(record);
};
int get_type() { return QS_TYPE_RANGE; }
void fill_keys_and_lengths(String *key_names, String *used_lengths);
void add_keys_and_lengths(String *key_names, String *used_lengths);
void add_info_string(String *str);
#ifndef DBUG_OFF
virtual void dbug_dump(int indent, bool verbose);
void dbug_dump(int indent, bool verbose);
#endif
};
......@@ -291,10 +356,11 @@ class QUICK_INDEX_MERGE_SELECT : public QUICK_SELECT_I
bool reverse_sorted() { return false; }
bool unique_key_range() { return false; }
int get_type() { return QS_TYPE_INDEX_MERGE; }
void fill_keys_and_lengths(String *key_names, String *used_lengths);
void add_keys_and_lengths(String *key_names, String *used_lengths);
void add_info_string(String *str);
bool check_if_keys_used(List<Item> *fields);
#ifndef DBUG_OFF
virtual void dbug_dump(int indent, bool verbose);
void dbug_dump(int indent, bool verbose);
#endif
bool push_quick_back(QUICK_RANGE_SELECT *quick_sel_range);
......@@ -317,7 +383,6 @@ class QUICK_INDEX_MERGE_SELECT : public QUICK_SELECT_I
THD *thd;
int prepare_unique();
bool reset_called;
/* used to get rows collected in Unique */
READ_RECORD read_record;
......@@ -326,9 +391,22 @@ class QUICK_INDEX_MERGE_SELECT : public QUICK_SELECT_I
/*
Rowid-Ordered Retrieval (ROR) index intersection quick select.
This quick select produces an intersection of records returned by several
QUICK_RANGE_SELECTs that return data ordered by rowid.
This quick select produces intersection of row sequences returned
by several QUICK_RANGE_SELECTs it "merges".
All merged QUICK_RANGE_SELECTs must return rowids in rowid order.
QUICK_ROR_INTERSECT_SELECT will return rows in rowid order, too.
All merged quick selects retrieve {rowid, covered_fields} tuples (not full
table records).
QUICK_ROR_INTERSECT_SELECT retrieves full records if it is not being used
by QUICK_ROR_INTERSECT_SELECT and all merged quick selects together don't
cover needed all fields.
If one of the merged quick selects is a Clustered PK range scan, it is
used only to filter rowid sequence produced by other merged quick selects.
*/
class QUICK_ROR_INTERSECT_SELECT : public QUICK_SELECT_I
{
public:
......@@ -343,28 +421,46 @@ class QUICK_ROR_INTERSECT_SELECT : public QUICK_SELECT_I
bool reverse_sorted() { return false; }
bool unique_key_range() { return false; }
int get_type() { return QS_TYPE_ROR_INTERSECT; }
void fill_keys_and_lengths(String *key_names, String *used_lengths);
void add_keys_and_lengths(String *key_names, String *used_lengths);
void add_info_string(String *str);
bool check_if_keys_used(List<Item> *fields);
#ifndef DBUG_OFF
virtual void dbug_dump(int indent, bool verbose);
void dbug_dump(int indent, bool verbose);
#endif
int init_ror_child_scan(bool reuse_handler);
int init_ror_merged_scan(bool reuse_handler);
bool push_quick_back(QUICK_RANGE_SELECT *quick_sel_range);
/* range quick selects this intersection consists of */
/*
Range quick selects this intersection consists of, not including
cpk_quick.
*/
List<QUICK_RANGE_SELECT> quick_selects;
/*
Merged quick select that uses Clustered PK, if there is one. This quick
select is not used for row retrieval, it is used for row retrieval.
*/
QUICK_RANGE_SELECT *cpk_quick;
MEM_ROOT alloc;
THD *thd;
bool reset_called;
bool need_to_fetch_row;
MEM_ROOT alloc; /* Memory pool for this and merged quick selects data. */
THD *thd; /* current thread */
bool need_to_fetch_row; /* if true, do retrieve full table records. */
};
/*
Rowid-Ordered Retrieval index union select.
This quick select produces union of row sequences returned by several
quick select it "merges".
All merged quick selects must return rowids in rowid order.
QUICK_ROR_UNION_SELECT will return rows in rowid order, too.
All merged quick selects are set not to retrieve full table records.
ROR-union quick select always retrieves full records.
*/
class QUICK_ROR_UNION_SELECT : public QUICK_SELECT_I
{
public:
......@@ -377,33 +473,30 @@ class QUICK_ROR_UNION_SELECT : public QUICK_SELECT_I
bool reverse_sorted() { return false; }
bool unique_key_range() { return false; }
int get_type() { return QS_TYPE_ROR_UNION; }
void fill_keys_and_lengths(String *key_names, String *used_lengths);
void add_keys_and_lengths(String *key_names, String *used_lengths);
void add_info_string(String *str);
bool check_if_keys_used(List<Item> *fields);
#ifndef DBUG_OFF
virtual void dbug_dump(int indent, bool verbose);
void dbug_dump(int indent, bool verbose);
#endif
bool push_quick_back(QUICK_SELECT_I *quick_sel_range);
/* range quick selects this index_merge read consists of */
List<QUICK_SELECT_I> quick_selects;
QUEUE queue;
MEM_ROOT alloc;
THD *thd;
byte *cur_rowid;
byte *prev_rowid;
uint rowid_length;
bool reset_called;
bool have_prev_rowid;
List<QUICK_SELECT_I> quick_selects; /* Merged quick selects */
QUEUE queue; /* Priority queue for merge operation */
MEM_ROOT alloc; /* Memory pool for this and merged quick selects data. */
THD *thd; /* current thread */
byte *cur_rowid; /* buffer used in get_next() */
byte *prev_rowid; /* rowid of last row returned by get_next() */
bool have_prev_rowid; /* true if prev_rowid has valid data */
uint rowid_length; /* table rowid length */
private:
static int queue_cmp(void *arg, byte *val1, byte *val2);
};
class QUICK_SELECT_DESC: public QUICK_RANGE_SELECT
{
public:
......
sql/sql_select.cc
View file @ dff98a8e
......@@ -10077,7 +10077,7 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
select_result *result=join->result;
Item *item_null= new Item_null();
CHARSET_INFO *cs= &my_charset_latin1;
int quick_type= -1;
int quick_type;
DBUG_ENTER("select_describe");
DBUG_PRINT("info", ("Select 0x%lx, type %s, message %s",
(ulong)join->select_lex, join->select_lex->type,
......@@ -10104,17 +10104,20 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
{
JOIN_TAB *tab=join->join_tab+i;
TABLE *table=tab->table;
char buff[512],*buff_ptr=buff;
char buff[512];
char buff1[512], buff2[512], buff3[512];
char keylen_str_buf[64];
char derived_name[64];
String extra(buff, sizeof(buff),cs);
String tmp1(buff1,sizeof(buff1),cs);
String tmp2(buff2,sizeof(buff2),cs);
String tmp3(buff3,sizeof(buff3),cs);
extra.length(0);
tmp1.length(0);
tmp2.length(0);
tmp3.length(0);
quick_type= -1;
item_list.empty();
item_list.push_back(new Item_int((int32)
join->select_lex->select_number));
......@@ -10165,7 +10168,7 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
else
item_list.push_back(item_null);
/* Build key,key_len, and ref values and add them to item_list */
/* Build "key", "key_len", and "ref" values and add them to item_list */
if (tab->ref.key_parts)
{
KEY *key_info=table->key_info+ tab->ref.key;
......@@ -10200,7 +10203,7 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
}
else if (tab->select && tab->select->quick)
{
tab->select->quick->fill_keys_and_lengths(&tmp2, &tmp3);
tab->select->quick->add_keys_and_lengths(&tmp2, &tmp3);
item_list.push_back(new Item_string(tmp2.ptr(),tmp2.length(),cs));
item_list.push_back(new Item_string(tmp3.ptr(),tmp3.length(),cs));
item_list.push_back(item_null);
......@@ -10211,9 +10214,11 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
item_list.push_back(item_null);
item_list.push_back(item_null);
}
/* Add "rows" field to item_list. */
item_list.push_back(new Item_int((longlong) (ulonglong)
join->best_positions[i]. records_read,
21));
/* Build "Extra" field and add it to item_list. */
my_bool key_read=table->key_read;
if (tab->type == JT_NEXT && table->used_keys.is_set(tab->index))
key_read=1;
......@@ -10225,38 +10230,51 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
item_list.push_back(new Item_string(tab->info,strlen(tab->info),cs));
else
{
if (quick_type == QUICK_SELECT_I::QS_TYPE_ROR_UNION ||
quick_type == QUICK_SELECT_I::QS_TYPE_ROR_INTERSECT ||
quick_type == QUICK_SELECT_I::QS_TYPE_INDEX_MERGE)
{
extra.append("; Using ");
tab->select->quick->add_info_string(&extra);
}
if (tab->select)
{
if (tab->use_quick == 2)
{
char buf[MAX_KEY/8+1];
sprintf(buff_ptr,"; Range checked for each record (index map: 0x%s)",
tab->keys.print(buf));
buff_ptr=strend(buff_ptr);
extra.append("; Range checked for each record (index map: 0x");
extra.append(tab->keys.print(buf));
extra.append(')');
}
else
buff_ptr=strmov(buff_ptr,"; Using where");
extra.append("; Using where");
}
if (key_read)
buff_ptr= strmov(buff_ptr,"; Using index");
extra.append("; Using index");
if (table->reginfo.not_exists_optimize)
buff_ptr= strmov(buff_ptr,"; Not exists");
extra.append("; Not exists");
if (need_tmp_table)
{
need_tmp_table=0;
buff_ptr= strmov(buff_ptr,"; Using temporary");
extra.append("; Using temporary");
}
if (need_order)
{
need_order=0;
buff_ptr= strmov(buff_ptr,"; Using filesort");
extra.append("; Using filesort");
}
if (distinct & test_all_bits(used_tables,thd->used_tables))
buff_ptr= strmov(buff_ptr,"; Distinct");
if (buff_ptr == buff)
buff_ptr+= 2; // Skip inital "; "
item_list.push_back(new Item_string(buff+2,(uint) (buff_ptr - buff)-2,
cs));
extra.append("; Distinct");
/* Skip initial "; "*/
const char *str= extra.ptr();
uint32 len= extra.length();
if (len)
{
str += 2;
len -= 2;
}
item_list.push_back(new Item_string(str, len, cs));
}
// For next iteration
used_tables|=table->map;
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7