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Commit 23476afd authored by Varun Gupta's avatar Varun Gupta
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Introduced an optimizer_switch for ORDER BY LIMIT

parent e0ee80c1
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mysql-test/main/sort_nest.result
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set use_sort_nest=1;
set optimizer_switch='cost_based_order_by_limit=on';
CREATE TABLE t0 (a int);
INSERT INTO t0 SELECT seq-1 from seq_1_to_10;
CREATE TABLE t1 (a int, b int);
......@@ -1772,7 +1772,6 @@ INSERT INTO t0 SELECT seq-1 from seq_1_to_10;
CREATE TABLE t1 (a int, b int);
INSERT INTO t1 SELECT a, a from t0;
CREATE TABLE t2 as SELECT * from t1;
set use_sort_nest=1;
EXPLAIN SELECT *
FROM t1,t2
WHERE t1.a=t2.a and t1.b= 4
......@@ -1804,7 +1803,6 @@ ANALYZE TABLE t1 PERSISTENT FOR ALL;
ANALYZE TABLE t2 PERSISTENT FOR ALL;
ANALYZE TABLE t3 PERSISTENT FOR ALL;
ANALYZE TABLE t4 PERSISTENT FOR ALL;
set use_sort_nest=1;
EXPLAIN SELECT t1.a, t2.b, t1.b, t1.b + t2.b
FROM t1,t2, t3
WHERE t1.a=t2.b and t2.a=t3.a
......@@ -1826,18 +1824,6 @@ a b b t1.b + t2.b
2 2 2 4
1 1 1 2
0 0 0 0
set use_sort_nest=0;
SELECT t1.a, t2.b, t1.b, t1.b + t2.b
FROM t1,t2, t3
WHERE t1.a=t2.b and t2.a=t3.a
ORDER BY abs(t3.a+t1.b) DESC
LIMIT 5;
a b b t1.b + t2.b
4 4 4 8
3 3 3 6
2 2 2 4
1 1 1 2
0 0 0 0
#
# No sort nest where ORDER BY item are expensive to compute like
# stored functions, subqueries etc
......@@ -1845,74 +1831,6 @@ CREATE FUNCTION f1(a INT) RETURNS INT
BEGIN
RETURN a;
END|
set use_sort_nest=1;
EXPLAIN SELECT t1.a, t2.b, t1.b, t1.b + t2.b
FROM t1,t2, t3
WHERE t1.a=t2.b and t2.a=t3.a
ORDER BY f1(t3.a+t1.b) DESC
LIMIT 5;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 5 Using temporary; Using filesort
1 SIMPLE t2 ALL NULL NULL NULL NULL 5 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t3 ref a a 5 test.t2.a 1 Using index
EXPLAIN FORMAT=JSON SELECT t1.a, t2.b, t1.b, t1.b + t2.b
FROM t1,t2, t3
WHERE t1.a=t2.b and t2.a=t3.a
ORDER BY f1(t3.a+t1.b) DESC
LIMIT 5;
EXPLAIN
{
"query_block": {
"select_id": 1,
"filesort": {
"sort_key": "f1(t3.a + t1.b) desc",
"temporary_table": {
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 5,
"filtered": 100
},
"block-nl-join": {
"table": {
"table_name": "t2",
"access_type": "ALL",
"rows": 5,
"filtered": 100
},
"buffer_type": "flat",
"buffer_size": "119",
"join_type": "BNL",
"attached_condition": "t2.b = t1.a and t2.a is not null"
},
"table": {
"table_name": "t3",
"access_type": "ref",
"possible_keys": ["a"],
"key": "a",
"key_length": "5",
"used_key_parts": ["a"],
"ref": ["test.t2.a"],
"rows": 1,
"filtered": 100,
"using_index": true
}
}
}
}
}
SELECT t1.a, t2.b, t1.b, t1.b + t2.b
FROM t1,t2, t3
WHERE t1.a=t2.b and t2.a=t3.a
ORDER BY f1(t3.a+t1.b) DESC
LIMIT 5;
a b b t1.b + t2.b
4 4 4 8
3 3 3 6
2 2 2 4
1 1 1 2
0 0 0 0
set use_sort_nest=0;
EXPLAIN SELECT t1.a, t2.b, t1.b, t1.b + t2.b
FROM t1,t2, t3
WHERE t1.a=t2.b and t2.a=t3.a
......@@ -1937,7 +1855,6 @@ drop function f1;
#
# Window function in order by clause, sort-nest not allowed
#
set use_sort_nest=1;
EXPLAIN SELECT t1.a, t2.b, t1.b, t1.b + t2.b
FROM t1,t2, t3
WHERE t1.a=t2.b AND t2.a=t3.a
......@@ -1947,71 +1864,6 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 5 Using temporary; Using filesort
1 SIMPLE t2 ALL NULL NULL NULL NULL 5 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t3 ref a a 5 test.t2.a 1 Using index
EXPLAIN FORMAT=JSON SELECT t1.a, t2.b, t1.b, t1.b + t2.b
FROM t1,t2, t3
WHERE t1.a=t2.b AND t2.a=t3.a
ORDER BY row_number() OVER (ORDER BY t1.a) DESC
LIMIT 5;
EXPLAIN
{
"query_block": {
"select_id": 1,
"filesort": {
"sort_key": "row_number() over ( order by t1.a) desc",
"window_functions_computation": {
"sorts": {
"filesort": {
"sort_key": "t1.a"
}
},
"temporary_table": {
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 5,
"filtered": 100
},
"block-nl-join": {
"table": {
"table_name": "t2",
"access_type": "ALL",
"rows": 5,
"filtered": 100
},
"buffer_type": "flat",
"buffer_size": "119",
"join_type": "BNL",
"attached_condition": "t2.b = t1.a and t2.a is not null"
},
"table": {
"table_name": "t3",
"access_type": "ref",
"possible_keys": ["a"],
"key": "a",
"key_length": "5",
"used_key_parts": ["a"],
"ref": ["test.t2.a"],
"rows": 1,
"filtered": 100,
"using_index": true
}
}
}
}
}
}
SELECT t1.a, t2.b, t1.b, t1.b + t2.b
FROM t1,t2, t3
WHERE t1.a=t2.b AND t2.a=t3.a
ORDER BY row_number() OVER (ORDER BY t1.a) DESC
LIMIT 5;
a b b t1.b + t2.b
4 4 4 8
3 3 3 6
2 2 2 4
1 1 1 2
0 0 0 0
set use_sort_nest=0;
SELECT t1.a, t2.b, t1.b, t1.b + t2.b
FROM t1,t2, t3
WHERE t1.a=t2.b AND t2.a=t3.a
......@@ -2029,7 +1881,6 @@ a b b t1.b + t2.b
#
# Dependent subqueries cannot have a sort-nest
#
set use_sort_nest=1;
EXPLAIN SELECT *
FROM t1
WHERE
......@@ -2053,23 +1904,9 @@ a b c
2 2 2
3 3 3
4 4 4
set use_sort_nest= 0;
SELECT *
FROM t1
WHERE
t1.b = (select t2.b from t2,t3,t4
where t2.a=t1.a and t3.b=t4.b
ORDER BY t2.c,t3.c limit 1);
a b c
0 0 0
1 1 1
2 2 2
3 3 3
4 4 4
#
# Independent subqueries can have a sort-nest
#
set use_sort_nest=1;
EXPLAIN SELECT *
FROM t1
WHERE
......@@ -2090,19 +1927,9 @@ where t2.a=t3.a and t3.b=t4.b
ORDER BY t2.c,t3.c limit 1);
a b c
0 0 0
set use_sort_nest= 0;
SELECT *
FROM t1
WHERE
t1.b = (select t2.b from t2,t3,t4
where t2.a=t3.a and t3.b=t4.b
ORDER BY t2.c,t3.c limit 1);
a b c
0 0 0
#
# Sort nest inside a derived table
#
set use_sort_nest=1;
EXPLAIN SELECT *
FROM (SELECT t1.a as t, t2.b as u, t1.b as v, t3.a as x
FROM t1,t2,t3
......@@ -2127,23 +1954,9 @@ t u v x
2 2 2 2
1 1 1 1
0 0 0 0
set use_sort_nest=0;
SELECT *
FROM (SELECT t1.a as t, t2.b as u, t1.b as v, t3.a as x
FROM t1,t2,t3
WHERE t1.a=t2.a AND t2.b=t3.a
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5)q;
t u v x
4 4 4 4
3 3 3 3
2 2 2 2
1 1 1 1
0 0 0 0
#
# sort-nest(t2,t1) and independent subquery in the SELECT list
#
set use_sort_nest=1;
EXPLAIN SELECT (SELECT A.a FROM t3 A WHERE A.a > 5 limit 1) as x,
t2.b, t1.b, t3.a
FROM t1,t2,t3
......@@ -2171,7 +1984,6 @@ x b b a
#
# sort-nest(t2,t1) and dependent subquery in the SELECT list
#
set use_sort_nest=1;
EXPLAIN SELECT (SELECT A.a FROM t3 A WHERE A.a = t1.b limit 1) as x,
t2.b, t1.b, t3.a
FROM t1,t2,t3
......@@ -2196,24 +2008,10 @@ x b b a
2 2 2 2
1 1 1 1
0 0 0 0
set use_sort_nest= 0;
SELECT (SELECT A.a FROM t3 A WHERE A.a = t1.b limit 1) as x,
t2.b, t1.b, t3.a
FROM t1,t2,t3
WHERE t1.a = t2.a and t2.c=t3.c
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5;
x b b a
4 4 4 4
3 3 3 3
2 2 2 2
1 1 1 1
0 0 0 0
#
# Dependent Subquery attached outside the sort-nest, references inside
# subquery changed to sort-nest field items
#
set use_sort_nest=1;
EXPLAIN SELECT t2.b, t1.b, t3.a
FROM t1,t2,t3
WHERE t1.a = t2.a AND t2.c = t3.c AND
......@@ -2300,20 +2098,10 @@ ORDER BY t2.b DESC, t1.b DESC
LIMIT 5;
b b a
2 2 2
set use_sort_nest= 0;
SELECT t2.b, t1.b, t3.a
FROM t1,t2,t3
WHERE t1.a = t2.a AND t2.c = t3.c AND
t1.b=(SELECT A.a FROM t3 A WHERE A.b > 1 and t3.b=t1.b limit 1)
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5;
b b a
2 2 2
#
# sort-nest(t2,t1) and independent subquery in the ORDER BY clause
#
# Subquery will be a constant in ORDER BY and will be removed
set use_sort_nest=1;
EXPLAIN SELECT t2.b, t1.b, t3.c
FROM t1,t2,t3
WHERE t1.a = t2.a and t2.c=t3.c
......@@ -2338,24 +2126,10 @@ b b c
2 2 2
3 3 3
4 4 4
set use_sort_nest= 0;
SELECT t2.b, t1.b, t3.c
FROM t1,t2,t3
WHERE t1.a = t2.a and t2.c=t3.c
ORDER BY t2.b, t1.b,
(SELECT A.a FROM t3 A WHERE A.a < 5 limit 1)
LIMIT 5;
b b c
0 0 0
1 1 1
2 2 2
3 3 3
4 4 4
#
# sort-nest(t2,t1) and dependent subquery in the ORDER BY clause
#
# Subquery is expensive to evaluate, so don't use a sort-nest
set use_sort_nest=1;
EXPLAIN SELECT t2.b, t1.b, t3.c
FROM t1,t2,t3
WHERE t1.a = t2.a and t2.c=t3.c
......@@ -2379,19 +2153,6 @@ b b c
2 2 2
3 3 3
4 4 4
set use_sort_nest= 0;
SELECT t2.b, t1.b, t3.c
FROM t1,t2,t3
WHERE t1.a = t2.a and t2.c=t3.c
ORDER BY t2.b, t1.b,
(SELECT A.a FROM t3 A WHERE A.a = t1.c limit 1)
LIMIT 5;
b b c
0 0 0
1 1 1
2 2 2
3 3 3
4 4 4
drop table t0,t1,t2,t3,t4;
CREATE TABLE t1 (a int, b int, c int, KEY a_b (a,b), KEY a_c (a,c));
insert into t1 values (0,1,0), (0,2,0), (0,3,0), (0,4,0), (0,5,0), (0,6,0);
......@@ -2401,7 +2162,6 @@ insert into t1 values (1,7,2), (1,8,2), (1,9,2), (1,10,2), (1,11,2), (1,12,2);
#
# index a_b should be used, no need for filesort
#
set use_sort_nest= 1;
select a,b,c from t1 where a=1 and c=2 order by b limit 5;
a b c
1 7 2
......@@ -2412,10 +2172,6 @@ a b c
explain select a,b,c from t1 where a=1 and c=2 order by b limit 5;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a_b,a_c a_b 5 NULL 10 Using index condition; Using where
set use_sort_nest= 0;
explain select a,b,c from t1 where a=1 and c=2 order by b limit 5;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a_b,a_c a_b 5 NULL 18 Using where
drop table t1;
#
# Tests where Index(scan, ref or range access) satisfies the ORDERING
......@@ -2428,9 +2184,8 @@ insert into t1 values (1,7,2), (1,8,2), (1,9,2), (1,10,2), (1,11,2), (1,12,2);
insert into t1 values (1,1,2);
#
# index key a_b, no need for filesort
# Also index condition pushdown is used with use_sort_nest=1
# Also index condition pushdown is used here
#
set use_sort_nest=1;
select a,b from t1 where a=1 and c=2 order by b limit 10;
a b
1 1
......@@ -2446,10 +2201,6 @@ a b
explain select a,b from t1 where a=1 and c=2 order by b limit 10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a_b,a_c a_b 5 NULL 19 Using index condition; Using where
set use_sort_nest=0;
explain select a,b from t1 where a=1 and c=2 order by b limit 10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a_b,a_c a_b 5 NULL 19 Using where
drop table t1;
CREATE TABLE t1(
a int NOT NULL,
......@@ -2460,7 +2211,6 @@ INSERT INTO t1 VALUES (1,'a'), (2,'b'), (3,'c'), (4,'d');
#
# Should use index condition
#
set use_sort_nest= 1;
SELECT * FROM t1 WHERE a BETWEEN 1 and 2 ORDER BY a LIMIT 2;
a b
1 a
......@@ -2468,14 +2218,9 @@ a b
EXPLAIN SELECT * FROM t1 WHERE a BETWEEN 1 and 2 ORDER BY a LIMIT 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 2 Using index condition
set use_sort_nest= 0;
EXPLAIN SELECT * FROM t1 WHERE a BETWEEN 1 and 2 ORDER BY a LIMIT 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 2 Using index condition
#
# Should not use index condition as ORDER by DESC is used
#
set use_sort_nest= 1;
EXPLAIN SELECT * FROM t1 WHERE a BETWEEN 1 and 2 ORDER BY a DESC LIMIT 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 2 Using where
......@@ -2483,10 +2228,6 @@ SELECT * FROM t1 WHERE a BETWEEN 1 and 2 ORDER BY a DESC LIMIT 2;
a b
2 b
1 a
set use_sort_nest= 0;
EXPLAIN SELECT * FROM t1 WHERE a BETWEEN 1 and 2 ORDER BY a DESC LIMIT 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range PRIMARY PRIMARY 4 NULL 2 Using where
drop table t1;
create table t1(a int, b int, c int, key(a), key a_b(a,b));
insert into t1 values (0,1,0), (0,2,0), (0,3,0);
......@@ -2501,7 +2242,6 @@ insert into t2 select a, b, c from t1;
#
# Using range scan
#
set use_sort_nest= 1;
SELECT * FROM t1,t2
WHERE
t1.a=2 AND t2.b > 8 AND
......@@ -2518,19 +2258,9 @@ ORDER BY t1.b LIMIT 10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a,a_b a_b 10 NULL 2 Using index condition
1 SIMPLE t2 ref b b 5 test.t1.b 1
set use_sort_nest= 0;
EXPLAIN SELECT * FROM t1,t2
WHERE
t1.a=2 AND t2.b > 8 AND
t1.b=t2.b
ORDER BY t1.b LIMIT 10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 range a,a_b a_b 10 NULL 2 Using index condition
1 SIMPLE t2 ref b b 5 test.t1.b 1
#
# Using ref access
#
set use_sort_nest= 1;
SELECT * FROM t1,t2
WHERE
t1.a=2 AND t2.c >= 1 AND
......@@ -2548,18 +2278,8 @@ ORDER BY t1.b LIMIT 10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a,a_b a_b 5 const 3 Using index condition; Using where
1 SIMPLE t2 ref b,c b 5 test.t1.b 1 Using where
set use_sort_nest= 0;
EXPLAIN SELECT * FROM t1,t2
WHERE
t1.a=2 AND t2.c >= 1 AND
t1.b=t2.b
ORDER BY t1.b LIMIT 10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref a,a_b a_b 5 const 3 Using where
1 SIMPLE t2 ref b,c b 5 test.t1.b 1 Using where
drop table t1,t2;
# TESTS with INDEX HINTS
set use_sort_nest=1;
create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1 (a int, b int,c int, key idx1(a), key idx2(a,b), key idx3(c));
......@@ -2568,7 +2288,6 @@ analyze table t1 persistent for all;
#
# Index idx1 to be used for index scan
#
set use_sort_nest=1;
SELECT * from t1 where b > 0 order by t1.a limit 2;
a b c
1 1 1
......@@ -2576,14 +2295,9 @@ a b c
EXPLAIN SELECT * from t1 where b > 0 order by t1.a limit 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL idx1 5 NULL 2 Using where
set use_sort_nest=0;
EXPLAIN SELECT * from t1 where b > 0 order by t1.a limit 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL idx1 5 NULL 2 Using where
#
# Index idx2 to be used for index scan(USE INDEX is used)
#
set use_sort_nest=1;
SELECT * from t1 USE INDEX(idx2) WHERE b > 0 ORDER BY t1.a LIMIT 2;
a b c
1 1 1
......@@ -2591,14 +2305,9 @@ a b c
EXPLAIN SELECT * from t1 USE INDEX(idx2) WHERE b > 0 ORDER BY t1.a LIMIT 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL idx2 10 NULL 2 Using where
set use_sort_nest=0;
EXPLAIN SELECT * from t1 USE INDEX(idx2) WHERE b > 0 ORDER BY t1.a LIMIT 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL idx2 10 NULL 2 Using where
#
# Index idx2 to be used for index scan(USE INDEX for ORDER BY is used)
#
set use_sort_nest=1;
SELECT * from t1 USE INDEX FOR ORDER BY(idx2)
WHERE b > 0
ORDER BY t1.a LIMIT 2;
......@@ -2610,16 +2319,9 @@ WHERE b > 0
ORDER BY t1.a LIMIT 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL idx2 10 NULL 2 Using where
set use_sort_nest=0;
EXPLAIN SELECT * from t1 USE INDEX FOR ORDER BY(idx2)
WHERE b > 0
ORDER BY t1.a LIMIT 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL idx2 10 NULL 2 Using where
#
# Use Filesort as idx3 does not resolve ORDER BY clause
#
set use_sort_nest=1;
SELECT * from t1 USE INDEX FOR ORDER BY(idx3)
WHERE b > 0
ORDER BY t1.a LIMIT 2;
......@@ -2631,16 +2333,9 @@ WHERE b > 0
ORDER BY t1.a LIMIT 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 5 Using where; Using filesort
set use_sort_nest=0;
EXPLAIN SELECT * from t1 USE INDEX FOR ORDER BY(idx3)
WHERE b > 0
ORDER BY t1.a LIMIT 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 5 Using where; Using filesort
#
# Using index idx2 as idx1 is ignored
#
set use_sort_nest=1;
SELECT * from t1 IGNORE INDEX(idx1)
WHERE b > 0
ORDER BY t1.a LIMIT 2;
......@@ -2652,16 +2347,9 @@ WHERE b > 0
ORDER BY t1.a LIMIT 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL idx2 10 NULL 2 Using where
set use_sort_nest=0;
EXPLAIN SELECT * from t1 IGNORE INDEX(idx1)
WHERE b > 0
ORDER BY t1.a LIMIT 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL idx2 10 NULL 2 Using where
#
# Use index idx2 for sorting, it is forced here
#
set use_sort_nest=1;
SELECT * from t1 FORCE INDEX(idx2)
WHERE b > 0
ORDER BY t1.a LIMIT 2;
......@@ -2673,16 +2361,9 @@ WHERE b > 0
ORDER BY t1.a LIMIT 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL idx2 10 NULL 2 Using where
set use_sort_nest=0;
EXPLAIN SELECT * from t1 FORCE INDEX(idx2)
WHERE b > 0
ORDER BY t1.a LIMIT 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL idx2 10 NULL 2 Using where
#
# Use FILESORT as idx3 cannot resolve ORDER BY clause
#
set use_sort_nest=1;
SELECT * from t1 FORCE INDEX FOR ORDER BY(idx3)
WHERE b > 0
ORDER BY t1.a LIMIT 2;
......@@ -2694,12 +2375,6 @@ WHERE b > 0
ORDER BY t1.a LIMIT 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 5 Using where; Using filesort
set use_sort_nest=0;
EXPLAIN SELECT * from t1 FORCE INDEX FOR ORDER BY(idx3)
WHERE b > 0
ORDER BY t1.a LIMIT 2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 5 Using where; Using filesort
drop table t0,t1;
#
# SORT-NEST WITH SEMI JOINS
......@@ -2724,7 +2399,6 @@ ANALYZE TABLE t4 PERSISTENT FOR ALL;
#
# SJM scan inside the sort-nest
#
set use_sort_nest=1;
EXPLAIN SELECT t1.a, t2.a, t1.b,t2.b
FROM t1, t2, t2 ot
WHERE t1.a=t2.a AND t2.c=ot.b AND t2.b < 4 AND
......@@ -2840,24 +2514,10 @@ a a b b
2 2 2 2
1 1 1 1
0 0 0 0
set use_sort_nest=0;
SELECT t1.a, t2.a, t1.b,t2.b
FROM t1, t2, t2 ot
WHERE t1.a=t2.a AND t2.c=ot.b AND t2.b < 4 AND
t1.b IN (SELECT it1.b FROM t3 it1,t4 it2
WHERE it1.a < 4 AND it1.a=it2.a)
ORDER BY t2.b DESC ,t1.b DESC
LIMIT 5;
a a b b
3 3 3 3
2 2 2 2
1 1 1 1
0 0 0 0
#
# SJM Lookup with sort-nest, where SJM lookup table is outside the
# sort-nest
#
set use_sort_nest=1;
EXPLAIN SELECT t1.a, t2.a, t1.b,t2.b
FROM t1, t2, t2 ot
WHERE t1.a=t2.a AND t2.b=ot.a AND t2.b < 4 AND
......@@ -2977,19 +2637,6 @@ a a b b
2 2 2 2
1 1 1 1
0 0 0 0
set use_sort_nest=0;
SELECT t1.a, t2.a, t1.b,t2.b
FROM t1, t2, t2 ot
WHERE t1.a=t2.a AND t2.b=ot.a AND t2.b < 4 AND
t1.b IN (SELECT it1.b FROM t3 it1,t4 it2
WHERE it1.a < 4 AND it1.a=it2.a)
ORDER BY t2.b DESC ,t1.b DESC
LIMIT 5;
a a b b
3 3 3 3
2 2 2 2
1 1 1 1
0 0 0 0
drop table t0,t1,t2,t3,t4;
#
# Firstmatch strategy
......@@ -3011,7 +2658,6 @@ ANALYZE TABLE t1 PERSISTENT FOR ALL;
ANALYZE TABLE t2 PERSISTENT FOR ALL;
ANALYZE TABLE t3 PERSISTENT FOR ALL;
ANALYZE TABLE t4 PERSISTENT FOR ALL;
set use_sort_nest=1;
EXPLAIN SELECT t1.a, t2.a, t1.b,t2.b
FROM t1, t2
WHERE t1.a=t2.a AND
......@@ -3036,36 +2682,11 @@ a a b b
2 2 2 2
1 1 1 1
0 0 0 0
set use_sort_nest=0;
EXPLAIN SELECT t1.a, t2.a, t1.b,t2.b
FROM t1, t2
WHERE t1.a=t2.a AND
t1.b IN (SELECT t3.b FROM t3,t4 WHERE t3.a <= 5 and t3.c = t2.b)
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL a NULL NULL NULL 10 Using temporary; Using filesort
1 PRIMARY t1 ALL NULL NULL NULL NULL 100 Using where; Using join buffer (flat, BNL join)
1 PRIMARY t3 ref b b 5 test.t1.b 2 Using where
1 PRIMARY t4 index NULL a 5 NULL 10 Using index; FirstMatch(t1)
SELECT t1.a, t2.a, t1.b,t2.b
FROM t1, t2
WHERE t1.a=t2.a AND
t1.b IN (SELECT t3.b FROM t3,t4 WHERE t3.a <= 5 and t3.c = t2.b)
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5;
a a b b
4 4 4 4
3 3 3 3
2 2 2 2
1 1 1 1
0 0 0 0
#
# Duplicate weedout
#
set @save_optimizer_switch= @@optimizer_switch;
set optimizer_switch='firstmatch=off';
set use_sort_nest=1;
EXPLAIN SELECT t1.a, t2.a, t1.b,t2.b
FROM t1, t2
WHERE t1.a=t2.a AND
......@@ -3090,30 +2711,6 @@ a a b b
2 2 2 2
1 1 1 1
0 0 0 0
set use_sort_nest=0;
EXPLAIN SELECT t1.a, t2.a, t1.b,t2.b
FROM t1, t2
WHERE t1.a=t2.a AND
t1.b IN (SELECT t3.b FROM t3,t4 WHERE t3.a <= 5 and t3.c = t2.b)
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t3 ALL b NULL NULL NULL 10 Using where; Start temporary; Using temporary; Using filesort
1 PRIMARY t2 ALL a NULL NULL NULL 10 Using where; Using join buffer (flat, BNL join)
1 PRIMARY t4 index NULL a 5 NULL 10 Using index; Using join buffer (incremental, BNL join)
1 PRIMARY t1 ALL NULL NULL NULL NULL 100 Using where; End temporary; Using join buffer (incremental, BNL join)
SELECT t1.a, t2.a, t1.b,t2.b
FROM t1, t2
WHERE t1.a=t2.a AND
t1.b IN (SELECT t3.b FROM t3,t4 WHERE t3.a <= 5 and t3.c = t2.b)
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5;
a a b b
4 4 4 4
3 3 3 3
2 2 2 2
1 1 1 1
0 0 0 0
set @@optimizer_switch= @save_optimizer_switch;
drop table t0,t1,t2,t3,t4;
......@@ -3127,7 +2724,6 @@ create table t2 as SELECT * from t1 where a < 5;
create table t3(a int, b int);
INSERT INTO t3 SELECT seq-1, seq-1 FROM seq_1_to_100;
<subquery2> outside the sort-nest
set use_sort_nest=1;
EXPLAIN SELECT * from t2,t1
WHERE t2.b=t1.b
AND
......@@ -3218,21 +2814,7 @@ a b a b
2 2 2 2
1 1 1 1
0 0 0 0
set use_sort_nest=0;
SELECT * from t2,t1
WHERE t2.b=t1.b
AND
t1.a IN (SELECT max(t3.a) FROM t3 GROUP BY t3.b)
ORDER BY t2.a DESC,t1.a DESC
LIMIT 5;
a b a b
4 4 4 4
3 3 3 3
2 2 2 2
1 1 1 1
0 0 0 0
<subquery2> inside the sort-nest
set use_sort_nest=1;
EXPLAIN SELECT * FROM t3,t2
WHERE t3.b=t2.b AND
t3.a IN (SELECT max(t1.a) FROM t1 GROUP BY t1.b)
......@@ -3316,16 +2898,4 @@ a b a b
2 2 2 2
1 1 1 1
0 0 0 0
set use_sort_nest=0;
SELECT * FROM t3,t2
WHERE t3.b=t2.b AND
t3.a IN (SELECT max(t1.a) FROM t1 GROUP BY t1.b)
ORDER BY t3.a DESC,t2.a DESC
LIMIT 5;
a b a b
4 4 4 4
3 3 3 3
2 2 2 2
1 1 1 1
0 0 0 0
DROP TABLE t0,t1,t2,t3;
mysql-test/main/sort_nest.test
View file @ 23476afd
--source include/have_sequence.inc
set use_sort_nest=1;
set optimizer_switch='cost_based_order_by_limit=on';
CREATE TABLE t0 (a int);
INSERT INTO t0 SELECT seq-1 from seq_1_to_10;
......@@ -594,7 +594,6 @@ WHERE t1.a=t2.a and t1.b= 4
ORDER BY t1.b DESC
LIMIT 5;
set use_sort_nest=1;
eval EXPLAIN $query;
eval $query;
......@@ -627,13 +626,9 @@ WHERE t1.a=t2.b and t2.a=t3.a
ORDER BY abs(t3.a+t1.b) DESC
LIMIT 5;
set use_sort_nest=1;
eval EXPLAIN $query;
eval $query;
set use_sort_nest=0;
eval $query;
--echo #
--echo # No sort nest where ORDER BY item are expensive to compute like
--echo # stored functions, subqueries etc
......@@ -654,12 +649,6 @@ WHERE t1.a=t2.b and t2.a=t3.a
ORDER BY f1(t3.a+t1.b) DESC
LIMIT 5;
set use_sort_nest=1;
eval EXPLAIN $query;
eval EXPLAIN FORMAT=JSON $query;
eval $query;
set use_sort_nest=0;
eval EXPLAIN $query;
eval $query;
......@@ -676,12 +665,7 @@ WHERE t1.a=t2.b AND t2.a=t3.a
ORDER BY row_number() OVER (ORDER BY t1.a) DESC
LIMIT 5;
set use_sort_nest=1;
eval EXPLAIN $query;
eval EXPLAIN FORMAT=JSON $query;
eval $query;
set use_sort_nest=0;
eval $query;
--echo #
......@@ -700,13 +684,9 @@ t1.b = (select t2.b from t2,t3,t4
where t2.a=t1.a and t3.b=t4.b
ORDER BY t2.c,t3.c limit 1);
set use_sort_nest=1;
eval EXPLAIN $query;
eval $query;
set use_sort_nest= 0;
eval $query;
--echo #
--echo # Independent subqueries can have a sort-nest
--echo #
......@@ -719,14 +699,9 @@ t1.b = (select t2.b from t2,t3,t4
where t2.a=t3.a and t3.b=t4.b
ORDER BY t2.c,t3.c limit 1);
set use_sort_nest=1;
eval EXPLAIN $query;
eval $query;
set use_sort_nest= 0;
eval $query;
--echo #
--echo # Sort nest inside a derived table
--echo #
......@@ -739,13 +714,9 @@ FROM (SELECT t1.a as t, t2.b as u, t1.b as v, t3.a as x
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5)q;
set use_sort_nest=1;
eval EXPLAIN $query;
eval $query;
set use_sort_nest=0;
eval $query;
--echo #
--echo # sort-nest(t2,t1) and independent subquery in the SELECT list
--echo #
......@@ -758,7 +729,6 @@ WHERE t1.a = t2.a
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5;
set use_sort_nest=1;
eval EXPLAIN $query;
eval $query;
......@@ -774,13 +744,9 @@ WHERE t1.a = t2.a and t2.c=t3.c
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5;
set use_sort_nest=1;
eval EXPLAIN $query;
eval $query;
set use_sort_nest= 0;
eval $query;
--echo #
--echo # Dependent Subquery attached outside the sort-nest, references inside
--echo # subquery changed to sort-nest field items
......@@ -794,14 +760,10 @@ t1.b=(SELECT A.a FROM t3 A WHERE A.b > 1 and t3.b=t1.b limit 1)
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5;
set use_sort_nest=1;
eval EXPLAIN $query;
eval EXPLAIN FORMAT=JSON $query;
eval $query;
set use_sort_nest= 0;
eval $query;
--echo #
--echo # sort-nest(t2,t1) and independent subquery in the ORDER BY clause
--echo #
......@@ -816,13 +778,9 @@ ORDER BY t2.b, t1.b,
(SELECT A.a FROM t3 A WHERE A.a < 5 limit 1)
LIMIT 5;
set use_sort_nest=1;
eval EXPLAIN $query;
eval $query;
set use_sort_nest= 0;
eval $query;
--echo #
--echo # sort-nest(t2,t1) and dependent subquery in the ORDER BY clause
--echo #
......@@ -837,13 +795,9 @@ ORDER BY t2.b, t1.b,
(SELECT A.a FROM t3 A WHERE A.a = t1.c limit 1)
LIMIT 5;
set use_sort_nest=1;
eval EXPLAIN $query;
eval $query;
set use_sort_nest= 0;
eval $query;
drop table t0,t1,t2,t3,t4;
CREATE TABLE t1 (a int, b int, c int, KEY a_b (a,b), KEY a_c (a,c));
......@@ -858,12 +812,9 @@ insert into t1 values (1,7,2), (1,8,2), (1,9,2), (1,10,2), (1,11,2), (1,12,2);
--echo #
let $query= select a,b,c from t1 where a=1 and c=2 order by b limit 5;
set use_sort_nest= 1;
eval $query;
eval explain $query;
set use_sort_nest= 0;
eval explain $query;
drop table t1;
--echo #
......@@ -880,18 +831,14 @@ insert into t1 values (1,1,2);
--echo #
--echo # index key a_b, no need for filesort
--echo # Also index condition pushdown is used with use_sort_nest=1
--echo # Also index condition pushdown is used here
--echo #
let $query= select a,b from t1 where a=1 and c=2 order by b limit 10;
set use_sort_nest=1;
eval $query;
eval explain $query;
set use_sort_nest=0;
eval explain $query;
drop table t1;
CREATE TABLE t1(
......@@ -908,26 +855,18 @@ INSERT INTO t1 VALUES (1,'a'), (2,'b'), (3,'c'), (4,'d');
let $query= SELECT * FROM t1 WHERE a BETWEEN 1 and 2 ORDER BY a LIMIT 2;
set use_sort_nest= 1;
eval $query;
eval EXPLAIN $query;
set use_sort_nest= 0;
eval EXPLAIN $query;
--echo #
--echo # Should not use index condition as ORDER by DESC is used
--echo #
let $query= SELECT * FROM t1 WHERE a BETWEEN 1 and 2 ORDER BY a DESC LIMIT 2;
set use_sort_nest= 1;
eval EXPLAIN $query;
eval $query;
set use_sort_nest= 0;
eval EXPLAIN $query;
drop table t1;
create table t1(a int, b int, c int, key(a), key a_b(a,b)); # 10 rows
......@@ -954,13 +893,9 @@ WHERE
t1.b=t2.b
ORDER BY t1.b LIMIT 10;
set use_sort_nest= 1;
eval $query;
eval EXPLAIN $query;
set use_sort_nest= 0;
eval EXPLAIN $query;
--echo #
--echo # Using ref access
--echo #
......@@ -971,19 +906,14 @@ WHERE
t1.b=t2.b
ORDER BY t1.b LIMIT 10;
set use_sort_nest= 1;
eval $query;
eval EXPLAIN $query;
set use_sort_nest= 0;
eval EXPLAIN $query;
drop table t1,t2;
--echo # TESTS with INDEX HINTS
set use_sort_nest=1;
create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1 (a int, b int,c int, key idx1(a), key idx2(a,b), key idx3(c));
......@@ -998,25 +928,17 @@ analyze table t1 persistent for all;
--echo #
let $query= SELECT * from t1 where b > 0 order by t1.a limit 2;
set use_sort_nest=1;
eval $query;
eval EXPLAIN $query;
set use_sort_nest=0;
eval EXPLAIN $query;
--echo #
--echo # Index idx2 to be used for index scan(USE INDEX is used)
--echo #
let $query= SELECT * from t1 USE INDEX(idx2) WHERE b > 0 ORDER BY t1.a LIMIT 2;
set use_sort_nest=1;
eval $query;
eval EXPLAIN $query;
set use_sort_nest=0;
eval EXPLAIN $query;
--echo #
--echo # Index idx2 to be used for index scan(USE INDEX for ORDER BY is used)
--echo #
......@@ -1026,13 +948,9 @@ SELECT * from t1 USE INDEX FOR ORDER BY(idx2)
WHERE b > 0
ORDER BY t1.a LIMIT 2;
set use_sort_nest=1;
eval $query;
eval EXPLAIN $query;
set use_sort_nest=0;
eval EXPLAIN $query;
--echo #
--echo # Use Filesort as idx3 does not resolve ORDER BY clause
--echo #
......@@ -1042,13 +960,9 @@ SELECT * from t1 USE INDEX FOR ORDER BY(idx3)
WHERE b > 0
ORDER BY t1.a LIMIT 2;
set use_sort_nest=1;
eval $query;
eval EXPLAIN $query;
set use_sort_nest=0;
eval EXPLAIN $query;
--echo #
--echo # Using index idx2 as idx1 is ignored
--echo #
......@@ -1058,13 +972,9 @@ SELECT * from t1 IGNORE INDEX(idx1)
WHERE b > 0
ORDER BY t1.a LIMIT 2;
set use_sort_nest=1;
eval $query;
eval EXPLAIN $query;
set use_sort_nest=0;
eval EXPLAIN $query;
--echo #
--echo # Use index idx2 for sorting, it is forced here
--echo #
......@@ -1074,13 +984,9 @@ SELECT * from t1 FORCE INDEX(idx2)
WHERE b > 0
ORDER BY t1.a LIMIT 2;
set use_sort_nest=1;
eval $query;
eval EXPLAIN $query;
set use_sort_nest=0;
eval EXPLAIN $query;
--echo #
--echo # Use FILESORT as idx3 cannot resolve ORDER BY clause
--echo #
......@@ -1090,13 +996,9 @@ SELECT * from t1 FORCE INDEX FOR ORDER BY(idx3)
WHERE b > 0
ORDER BY t1.a LIMIT 2;
set use_sort_nest=1;
eval $query;
eval EXPLAIN $query;
set use_sort_nest=0;
eval EXPLAIN $query;
drop table t0,t1;
--echo #
......@@ -1138,14 +1040,10 @@ FROM t1, t2, t2 ot
ORDER BY t2.b DESC ,t1.b DESC
LIMIT 5;
set use_sort_nest=1;
eval EXPLAIN $query;
eval EXPLAIN FORMAT=JSON $query;
eval $query;
set use_sort_nest=0;
eval $query;
--echo #
--echo # SJM Lookup with sort-nest, where SJM lookup table is outside the
--echo # sort-nest
......@@ -1160,14 +1058,10 @@ FROM t1, t2, t2 ot
ORDER BY t2.b DESC ,t1.b DESC
LIMIT 5;
set use_sort_nest=1;
eval EXPLAIN $query;
eval EXPLAIN FORMAT=JSON $query;
eval $query;
set use_sort_nest=0;
eval $query;
drop table t0,t1,t2,t3,t4;
......@@ -1205,15 +1099,9 @@ FROM t1, t2
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5;
set use_sort_nest=1;
eval EXPLAIN $query;
eval $query;
set use_sort_nest=0;
eval EXPLAIN $query;
eval $query;
--echo #
--echo # Duplicate weedout
--echo #
......@@ -1229,11 +1117,6 @@ FROM t1, t2
ORDER BY t2.b DESC, t1.b DESC
LIMIT 5;
set use_sort_nest=1;
eval EXPLAIN $query;
eval $query;
set use_sort_nest=0;
eval EXPLAIN $query;
eval $query;
......@@ -1262,14 +1145,10 @@ t1.a IN (SELECT max(t3.a) FROM t3 GROUP BY t3.b)
ORDER BY t2.a DESC,t1.a DESC
LIMIT 5;
set use_sort_nest=1;
eval EXPLAIN $query;
eval EXPLAIN FORMAT=JSON $query;
eval $query;
set use_sort_nest=0;
eval $query;
--echo <subquery2> inside the sort-nest
let $query=
......@@ -1279,12 +1158,8 @@ t3.a IN (SELECT max(t1.a) FROM t1 GROUP BY t1.b)
ORDER BY t3.a DESC,t2.a DESC
LIMIT 5;
set use_sort_nest=1;
eval EXPLAIN $query;
eval EXPLAIN FORMAT=JSON $query;
eval $query;
set use_sort_nest=0;
eval $query;
DROP TABLE t0,t1,t2,t3;
mysql-test/main/sort_nest_dbt3.result
View file @ 23476afd
......@@ -12,42 +12,15 @@ dbt3.lineitem analyze status OK
Table Op Msg_type Msg_text
dbt3.nation analyze status Engine-independent statistics collected
dbt3.nation analyze status OK
# done to avoid filter for now
# done use filter for now
set optimizer_switch='rowid_filter=off';
set use_sort_nest=1;
set optimizer_switch='cost_based_order_by_limit=on';
#
# USING INDEXES FOR ORDERING
#
#
# Using index scan on first table
#
set use_sort_nest=1;
explain SELECT
c_nationkey, c_name, o_orderDate, o_totalprice, c_acctbal
FROM
orders, customer
WHERE
c_custkey= o_custkey
ORDER BY o_orderDATE DESC
LIMIT 5;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE orders index i_o_custkey i_o_orderdate 4 NULL 5 Using where
1 SIMPLE customer eq_ref PRIMARY PRIMARY 4 dbt3.orders.o_custkey 1
SELECT
c_nationkey, c_name, o_orderDate, o_totalprice, c_acctbal
FROM
orders, customer
WHERE
c_custkey= o_custkey
ORDER BY o_orderDATE DESC
LIMIT 5;
c_nationkey c_name o_orderDate o_totalprice c_acctbal
16 Customer#000000088 1998-08-02 131752.07 8031.44
0 Customer#000000080 1998-07-30 141858.97 7383.53
10 Customer#000000049 1998-07-29 37776.79 4573.94
3 Customer#000000022 1998-07-28 139104.17 591.98
3 Customer#000000022 1998-07-27 82746.74 591.98
set use_sort_nest=0;
explain SELECT
c_nationkey, c_name, o_orderDate, o_totalprice, c_acctbal
FROM
......@@ -78,35 +51,6 @@ c_nationkey c_name o_orderDate o_totalprice c_acctbal
# the ordering
#
alter table orders add key o_orderdate(o_orderDATE, o_custkey);
set use_sort_nest=1;
explain SELECT
o_custkey, c_name, o_orderDate, o_totalprice, c_acctbal
FROM
orders, customer
WHERE
c_custkey= o_custkey AND
o_orderDATE >='1997-07-30' and o_orderDATE <= '1998-07-30'
ORDER BY o_orderDATE, o_custkey DESC
LIMIT 5;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE orders range i_o_orderdate,i_o_custkey,o_orderdate i_o_orderdate 4 NULL 242 Using index condition; Using where; Using filesort
1 SIMPLE customer eq_ref PRIMARY PRIMARY 4 dbt3.orders.o_custkey 1
SELECT
o_custkey, c_name, o_orderDate, o_totalprice, c_acctbal
FROM
orders, customer
WHERE
c_custkey= o_custkey AND
o_orderDATE >='1997-07-30' and o_orderDATE <= '1998-07-30'
ORDER BY o_orderDATE, o_custkey DESC
LIMIT 5;
o_custkey c_name o_orderDate o_totalprice c_acctbal
130 Customer#000000130 1997-07-30 67979.49 5073.58
101 Customer#000000101 1997-07-31 79189.58 7470.96
13 Customer#000000013 1997-07-31 125188.72 3857.34
64 Customer#000000064 1997-08-03 76164.41 -646.64
50 Customer#000000050 1997-08-03 20791.5 4266.13
set use_sort_nest=0;
explain SELECT
o_custkey, c_name, o_orderDate, o_totalprice, c_acctbal
FROM
......@@ -141,41 +85,6 @@ alter table orders drop key o_orderDate;
#
# Filesort on first table (orders)
#
set use_sort_nest=1;
explain SELECT
c_nationkey, c_name, o_orderDate, o_totalprice, c_acctbal, n_name
FROM
orders, customer, nation
WHERE
c_custkey= o_custkey AND c_nationkey=n_nationkey AND
o_orderDATE >='1997-01-30' and o_orderDATE <= '1997-12-31'
ORDER BY o_totalprice DESC
LIMIT 10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE orders range i_o_orderdate,i_o_custkey i_o_orderdate 4 NULL 197 Using index condition; Using where; Using filesort
1 SIMPLE customer eq_ref PRIMARY,i_c_nationkey PRIMARY 4 dbt3.orders.o_custkey 1 Using where
1 SIMPLE nation eq_ref PRIMARY PRIMARY 4 dbt3.customer.c_nationkey 1
SELECT
c_nationkey, c_name, o_orderDate, o_totalprice, c_acctbal, n_name
FROM
orders, customer, nation
WHERE
c_custkey= o_custkey AND c_nationkey=n_nationkey AND
o_orderDATE >='1997-01-30' and o_orderDATE <= '1997-12-31'
ORDER BY o_totalprice DESC
LIMIT 10;
c_nationkey c_name o_orderDate o_totalprice c_acctbal n_name
5 Customer#000000010 1997-04-04 258779.02 2753.54 ETHIOPIA
0 Customer#000000076 1997-08-24 231831.35 5745.33 ALGERIA
9 Customer#000000094 1997-10-17 224382.57 5500.11 INDONESIA
6 Customer#000000046 1997-05-26 216826.73 5744.59 FRANCE
3 Customer#000000005 1997-04-23 210643.96 794.47 CANADA
11 Customer#000000148 1997-07-25 206179.68 2135.6 IRAQ
2 Customer#000000101 1997-07-28 204163.1 7470.96 BRAZIL
3 Customer#000000005 1997-11-09 190142.17 794.47 CANADA
9 Customer#000000094 1997-11-30 187516.29 5500.11 INDONESIA
3 Customer#000000005 1997-11-12 185496.66 794.47 CANADA
set use_sort_nest=0;
explain SELECT
c_nationkey, c_name, o_orderDate, o_totalprice, c_acctbal, n_name
FROM
......@@ -212,56 +121,6 @@ c_nationkey c_name o_orderDate o_totalprice c_acctbal n_name
#
# Filesort on first table (lineitem)
#
show create table orders;
Table Create Table
orders CREATE TABLE `orders` (
`o_orderkey` int(11) NOT NULL,
`o_custkey` int(11) DEFAULT NULL,
`o_orderstatus` char(1) DEFAULT NULL,
`o_totalprice` double DEFAULT NULL,
`o_orderDATE` date DEFAULT NULL,
`o_orderpriority` char(15) DEFAULT NULL,
`o_clerk` char(15) DEFAULT NULL,
`o_shippriority` int(11) DEFAULT NULL,
`o_comment` varchar(79) DEFAULT NULL,
PRIMARY KEY (`o_orderkey`),
KEY `i_o_orderdate` (`o_orderDATE`),
KEY `i_o_custkey` (`o_custkey`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1
set use_sort_nest=1;
explain SELECT
l_extendedprice, o_orderkey, o_totalprice, l_shipDATE
FROM
orders, lineitem
WHERE
o_orderkey = l_orderkey AND
l_shipDATE >= '1996-01-01' AND l_shipDATE <= '1996-12-31'
ORDER BY l_extendedprice DESC
LIMIT 10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE lineitem range PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity i_l_shipdate 4 NULL 812 Using index condition; Using filesort
1 SIMPLE orders eq_ref PRIMARY PRIMARY 4 dbt3.lineitem.l_orderkey 1
SELECT
l_extendedprice, o_orderkey, o_totalprice, l_shipDATE
FROM
orders, lineitem
WHERE
o_orderkey = l_orderkey AND
l_shipDATE >= '1996-01-01' AND l_shipDATE <= '1996-12-31'
ORDER BY l_extendedprice DESC
LIMIT 10;
l_extendedprice o_orderkey o_totalprice l_shipDATE
54559.5 1574 179923.54 1996-12-14
53508.5 2342 104038.78 1996-08-28
53458 1153 220727.97 1996-06-27
53075.82 2721 59180.25 1996-02-14
52830.33 1284 106122.38 1996-04-11
52657.5 2276 141159.63 1996-07-13
52290.84 4773 196080.26 1996-01-26
51752.16 1607 166335.03 1996-02-22
51751.35 1700 89143.36 1996-09-26
51709.4 1254 94649.25 1996-03-07
set use_sort_nest=0;
explain SELECT
l_extendedprice, o_orderkey, o_totalprice, l_shipDATE
FROM
......@@ -300,7 +159,6 @@ l_extendedprice o_orderkey o_totalprice l_shipDATE
#
# FILESORT USING SORT-NEST on (orders, customer)
#
set use_sort_nest=1;
explain SELECT
c_nationkey, c_name, o_orderDate, o_totalprice, c_acctbal, n_name
FROM
......@@ -335,44 +193,9 @@ c_nationkey c_name o_orderDate o_totalprice c_acctbal n_name
11 Customer#000000148 1997-07-25 206179.68 2135.6 IRAQ
18 Customer#000000082 1997-07-20 15082.82 9468.34 CHINA
10 Customer#000000055 1997-07-16 46380.69 4572.11 IRAN
set use_sort_nest=0;
explain SELECT
c_nationkey, c_name, o_orderDate, o_totalprice, c_acctbal, n_name
FROM
orders, customer, nation
WHERE
c_custkey= o_custkey AND c_nationkey=n_nationkey AND
o_orderDATE >='1997-07-01' and o_orderDATE <= '1997-07-31'
ORDER BY o_orderDATE DESC, c_acctbal DESC
LIMIT 10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE orders range i_o_orderdate,i_o_custkey i_o_orderdate 4 NULL 20 Using index condition; Using where; Using temporary; Using filesort
1 SIMPLE customer eq_ref PRIMARY,i_c_nationkey PRIMARY 4 dbt3.orders.o_custkey 1 Using where
1 SIMPLE nation eq_ref PRIMARY PRIMARY 4 dbt3.customer.c_nationkey 1
SELECT
c_nationkey, c_name, o_orderDate, o_totalprice, c_acctbal, n_name
FROM
orders, customer, nation
WHERE
c_custkey= o_custkey AND c_nationkey=n_nationkey AND
o_orderDATE >='1997-07-01' and o_orderDATE <= '1997-07-31'
ORDER BY o_orderDATE DESC, c_acctbal DESC
LIMIT 10;
c_nationkey c_name o_orderDate o_totalprice c_acctbal n_name
2 Customer#000000101 1997-07-31 79189.58 7470.96 BRAZIL
3 Customer#000000013 1997-07-31 125188.72 3857.34 CANADA
9 Customer#000000130 1997-07-30 67979.49 5073.58 INDONESIA
11 Customer#000000148 1997-07-29 88448.24 2135.6 IRAQ
2 Customer#000000101 1997-07-28 204163.1 7470.96 BRAZIL
11 Customer#000000052 1997-07-28 46393.97 5630.28 IRAQ
4 Customer#000000004 1997-07-25 11405.4 2866.83 EGYPT
11 Customer#000000148 1997-07-25 206179.68 2135.6 IRAQ
18 Customer#000000082 1997-07-20 15082.82 9468.34 CHINA
10 Customer#000000055 1997-07-16 46380.69 4572.11 IRAN
#
# Sort-nest on table (lineitem, orders)
#
set use_sort_nest=1;
explain SELECT
c_acctbal, c_name, o_orderDate, l_extendedprice, l_orderkey
FROM
......@@ -427,65 +250,9 @@ c_acctbal c_name o_orderDate l_extendedprice l_orderkey
9904.28 Customer#000000043 1998-02-06 47339.52 5671
8959.65 Customer#000000149 1996-11-12 47247.52 5606
5744.59 Customer#000000046 1998-04-14 45589.72 5604
set use_sort_nest=0;
explain SELECT
c_acctbal, c_name, o_orderDate, l_extendedprice, l_orderkey
FROM
orders, customer, lineitem
WHERE
c_custkey= o_custkey
AND
l_orderkey = o_orderkey
AND
l_orderkey between 5500 AND 6000
AND
l_shipDATE >= '1997-01-01' and l_shipDATE <= '1998-08-10'
ORDER BY l_extendedprice DESC, o_orderDATE DESC
LIMIT 20;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE lineitem range PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity i_l_orderkey_quantity 4 NULL 338 Using index condition; Using where; Using temporary; Using filesort
1 SIMPLE orders eq_ref PRIMARY,i_o_custkey PRIMARY 4 dbt3.lineitem.l_orderkey 1 Using where
1 SIMPLE customer eq_ref PRIMARY PRIMARY 4 dbt3.orders.o_custkey 1
SELECT
c_acctbal, c_name, o_orderDate, l_extendedprice, l_orderkey
FROM
orders, customer, lineitem
WHERE
c_custkey= o_custkey
AND
l_orderkey = o_orderkey
AND
l_orderkey between 5500 AND 6000
AND
l_shipDATE >= '1997-01-01' and l_shipDATE <= '1998-08-10'
ORDER BY l_extendedprice DESC, o_orderDATE DESC
LIMIT 20;
c_acctbal c_name o_orderDate l_extendedprice l_orderkey
1842.49 Customer#000000124 1997-11-06 54759.5 5857
2135.6 Customer#000000148 1997-04-14 53909.8 5952
4681.03 Customer#000000016 1998-07-06 53811.31 5761
794.47 Customer#000000005 1997-04-23 53758.5 5859
-234.12 Customer#000000125 1997-01-11 53468.31 5829
5121.28 Customer#000000079 1998-05-31 53208 5633
5744.59 Customer#000000046 1998-04-14 50770.37 5604
-917.75 Customer#000000037 1997-07-13 50310.72 5793
121.65 Customer#000000002 1998-05-28 49830.24 5507
121.65 Customer#000000002 1998-05-28 49542.24 5507
7470.96 Customer#000000101 1997-05-27 49411.82 5923
5327.38 Customer#000000095 1997-10-04 48859.36 5505
1842.49 Customer#000000124 1997-11-06 48661.41 5857
4573.94 Customer#000000049 1997-02-14 48557.11 5762
-646.64 Customer#000000064 1997-01-01 48219.92 5895
-646.64 Customer#000000064 1997-01-01 48039.64 5895
5121.28 Customer#000000079 1998-05-31 48004.8 5633
9904.28 Customer#000000043 1998-02-06 47339.52 5671
8959.65 Customer#000000149 1996-11-12 47247.52 5606
5744.59 Customer#000000046 1998-04-14 45589.72 5604
########################################################################
#
# Sort-nest on table (customer, orders, lineitem)
#
set use_sort_nest=1;
explain SELECT
l_extendedprice, c_acctbal, o_totalprice, o_orderDate, l_orderkey
FROM
......@@ -547,65 +314,4 @@ l_extendedprice c_acctbal o_totalprice o_orderDate l_orderkey
28948.59 6819.74 182966.39 1994-07-17 5572
26732.43 9561.95 101429.61 1993-04-21 5670
24590.68 9561.95 95312.81 1992-03-28 5953
set use_sort_nest=0;
explain SELECT
l_extendedprice, c_acctbal, o_totalprice, o_orderDate, l_orderkey
FROM
orders, customer, lineitem, nation
WHERE
c_custkey= o_custkey
AND
l_orderkey = o_orderkey
AND
n_nationkey = c_nationkey
AND
l_orderkey between 5500 AND 6000
AND
c_custkey between 1 and 10
ORDER BY
l_extendedprice DESC, c_acctbal DESC, o_totalprice DESC
LIMIT 20;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE customer range PRIMARY,i_c_nationkey PRIMARY 4 NULL 7 Using index condition; Using where; Using temporary; Using filesort
1 SIMPLE nation eq_ref PRIMARY PRIMARY 4 dbt3.customer.c_nationkey 1 Using index
1 SIMPLE orders ref PRIMARY,i_o_custkey i_o_custkey 5 dbt3.customer.c_custkey 15 Using where
1 SIMPLE lineitem ref PRIMARY,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 dbt3.orders.o_orderkey 4
SELECT
l_extendedprice, c_acctbal, o_totalprice, o_orderDate, l_orderkey
FROM
orders, customer, lineitem, nation
WHERE
c_custkey= o_custkey
AND
l_orderkey = o_orderkey
AND
n_nationkey = c_nationkey
AND
l_orderkey between 5500 AND 6000
AND
c_custkey between 1 and 10
ORDER BY
l_extendedprice DESC, c_acctbal DESC, o_totalprice DESC
LIMIT 20;
l_extendedprice c_acctbal o_totalprice o_orderDate l_orderkey
53758.5 794.47 210643.96 1997-04-23 5859
49830.24 121.65 140363.7 1998-05-28 5507
49542.24 121.65 140363.7 1998-05-28 5507
48745.11 6819.74 122823.78 1993-04-05 5794
47992.64 6819.74 140838.11 1998-06-26 5763
47615.98 6819.74 182966.39 1994-07-17 5572
46705.74 9561.95 101429.61 1993-04-21 5670
44467.59 121.65 44777.63 1992-07-08 5893
44442.3 6819.74 122823.78 1993-04-05 5794
39723.6 794.47 210643.96 1997-04-23 5859
37048.32 9561.95 95312.81 1992-03-28 5953
36860.25 794.47 210643.96 1997-04-23 5859
32996.16 6819.74 140838.11 1998-06-26 5763
31416.68 6819.74 182966.39 1994-07-17 5572
31219.32 794.47 210643.96 1997-04-23 5859
31042.34 9561.95 95312.81 1992-03-28 5953
29462.13 794.47 210643.96 1997-04-23 5859
28948.59 6819.74 182966.39 1994-07-17 5572
26732.43 9561.95 101429.61 1993-04-21 5670
24590.68 9561.95 95312.81 1992-03-28 5953
drop database dbt3;
mysql-test/main/sort_nest_dbt3.test
View file @ 23476afd
......@@ -10,9 +10,9 @@ analyze table lineitem persistent for all;
analyze table nation persistent for all;
--enable_query_log
--echo # done to avoid filter for now
--echo # done use filter for now
set optimizer_switch='rowid_filter=off';
set use_sort_nest=1;
set optimizer_switch='cost_based_order_by_limit=on';
--echo #
--echo # USING INDEXES FOR ORDERING
......@@ -32,11 +32,6 @@ let $query= SELECT
ORDER BY o_orderDATE DESC
LIMIT 5;
set use_sort_nest=1;
eval explain $query;
eval $query;
set use_sort_nest=0;
eval explain $query;
eval $query;
......@@ -57,18 +52,11 @@ let $query= SELECT
ORDER BY o_orderDATE, o_custkey DESC
LIMIT 5;
set use_sort_nest=1;
eval explain $query;
eval $query;
set use_sort_nest=0;
eval explain $query;
eval $query;
alter table orders drop key o_orderDate;
###############################################################################
--echo #
--echo # USING FILESORT
--echo #
......@@ -87,11 +75,6 @@ let $query= SELECT
ORDER BY o_totalprice DESC
LIMIT 10;
set use_sort_nest=1;
eval explain $query;
eval $query;
set use_sort_nest=0;
eval explain $query;
eval $query;
......@@ -100,8 +83,6 @@ eval $query;
--echo # Filesort on first table (lineitem)
--echo #
show create table orders;
let $query= SELECT
l_extendedprice, o_orderkey, o_totalprice, l_shipDATE
FROM
......@@ -112,17 +93,9 @@ let $query= SELECT
ORDER BY l_extendedprice DESC
LIMIT 10;
set use_sort_nest=1;
eval explain $query;
eval $query;
set use_sort_nest=0;
eval explain $query;
eval $query;
###############################################################################
--echo #
--echo # Using Filesort with Sort Nest
--echo #
......@@ -141,16 +114,9 @@ let $query= SELECT
ORDER BY o_orderDATE DESC, c_acctbal DESC
LIMIT 10;
set use_sort_nest=1;
eval explain $query;
eval $query;
set use_sort_nest=0;
eval explain $query;
eval $query;
--echo #
--echo # Sort-nest on table (lineitem, orders)
--echo #
......@@ -171,16 +137,9 @@ let $query= SELECT
LIMIT 20;
set use_sort_nest=1;
eval explain $query;
eval $query;
set use_sort_nest=0;
eval explain $query;
eval $query;
--echo ########################################################################
--echo #
--echo # Sort-nest on table (customer, orders, lineitem)
--echo #
......@@ -204,13 +163,7 @@ let $query= SELECT
LIMIT 20;
set use_sort_nest=1;
eval explain $query;
eval $query;
set use_sort_nest=0;
eval explain $query;
eval $query;
drop database dbt3;
mysql-test/main/sort_nest_dbt3_innodb.result
View file @ 23476afd
......@@ -13,42 +13,15 @@ dbt3.lineitem analyze status OK
Table Op Msg_type Msg_text
dbt3.nation analyze status Engine-independent statistics collected
dbt3.nation analyze status OK
# done to avoid filter for now
# done use filter for now
set optimizer_switch='rowid_filter=off';
set use_sort_nest=1;
set optimizer_switch='cost_based_order_by_limit=on';
#
# USING INDEXES FOR ORDERING
#
#
# Using index scan on first table
#
set use_sort_nest=1;
explain SELECT
c_nationkey, c_name, o_orderDate, o_totalprice, c_acctbal
FROM
orders, customer
WHERE
c_custkey= o_custkey
ORDER BY o_orderDATE DESC
LIMIT 5;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE orders index i_o_custkey i_o_orderdate 4 NULL 5 Using where
1 SIMPLE customer eq_ref PRIMARY PRIMARY 4 dbt3.orders.o_custkey 1
SELECT
c_nationkey, c_name, o_orderDate, o_totalprice, c_acctbal
FROM
orders, customer
WHERE
c_custkey= o_custkey
ORDER BY o_orderDATE DESC
LIMIT 5;
c_nationkey c_name o_orderDate o_totalprice c_acctbal
16 Customer#000000088 1998-08-02 131752.07 8031.44
0 Customer#000000080 1998-07-30 141858.97 7383.53
10 Customer#000000049 1998-07-29 37776.79 4573.94
3 Customer#000000022 1998-07-28 139104.17 591.98
3 Customer#000000022 1998-07-27 82746.74 591.98
set use_sort_nest=0;
explain SELECT
c_nationkey, c_name, o_orderDate, o_totalprice, c_acctbal
FROM
......@@ -79,35 +52,6 @@ c_nationkey c_name o_orderDate o_totalprice c_acctbal
# the ordering
#
alter table orders add key o_orderdate(o_orderDATE, o_custkey);
set use_sort_nest=1;
explain SELECT
o_custkey, c_name, o_orderDate, o_totalprice, c_acctbal
FROM
orders, customer
WHERE
c_custkey= o_custkey AND
o_orderDATE >='1997-07-30' and o_orderDATE <= '1998-07-30'
ORDER BY o_orderDATE, o_custkey DESC
LIMIT 5;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE orders range i_o_orderdate,i_o_custkey,o_orderdate i_o_orderdate 4 NULL 217 Using index condition; Using where; Using filesort
1 SIMPLE customer eq_ref PRIMARY PRIMARY 4 dbt3.orders.o_custkey 1
SELECT
o_custkey, c_name, o_orderDate, o_totalprice, c_acctbal
FROM
orders, customer
WHERE
c_custkey= o_custkey AND
o_orderDATE >='1997-07-30' and o_orderDATE <= '1998-07-30'
ORDER BY o_orderDATE, o_custkey DESC
LIMIT 5;
o_custkey c_name o_orderDate o_totalprice c_acctbal
130 Customer#000000130 1997-07-30 67979.49 5073.58
101 Customer#000000101 1997-07-31 79189.58 7470.96
13 Customer#000000013 1997-07-31 125188.72 3857.34
64 Customer#000000064 1997-08-03 76164.41 -646.64
50 Customer#000000050 1997-08-03 20791.5 4266.13
set use_sort_nest=0;
explain SELECT
o_custkey, c_name, o_orderDate, o_totalprice, c_acctbal
FROM
......@@ -142,41 +86,6 @@ alter table orders drop key o_orderDate;
#
# Filesort on first table (orders)
#
set use_sort_nest=1;
explain SELECT
c_nationkey, c_name, o_orderDate, o_totalprice, c_acctbal, n_name
FROM
orders, customer, nation
WHERE
c_custkey= o_custkey AND c_nationkey=n_nationkey AND
o_orderDATE >='1997-01-30' and o_orderDATE <= '1997-12-31'
ORDER BY o_totalprice DESC
LIMIT 10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE orders range i_o_orderdate,i_o_custkey i_o_orderdate 4 NULL 201 Using index condition; Using where; Using filesort
1 SIMPLE customer eq_ref PRIMARY,i_c_nationkey PRIMARY 4 dbt3.orders.o_custkey 1 Using where
1 SIMPLE nation eq_ref PRIMARY PRIMARY 4 dbt3.customer.c_nationkey 1
SELECT
c_nationkey, c_name, o_orderDate, o_totalprice, c_acctbal, n_name
FROM
orders, customer, nation
WHERE
c_custkey= o_custkey AND c_nationkey=n_nationkey AND
o_orderDATE >='1997-01-30' and o_orderDATE <= '1997-12-31'
ORDER BY o_totalprice DESC
LIMIT 10;
c_nationkey c_name o_orderDate o_totalprice c_acctbal n_name
5 Customer#000000010 1997-04-04 258779.02 2753.54 ETHIOPIA
0 Customer#000000076 1997-08-24 231831.35 5745.33 ALGERIA
9 Customer#000000094 1997-10-17 224382.57 5500.11 INDONESIA
6 Customer#000000046 1997-05-26 216826.73 5744.59 FRANCE
3 Customer#000000005 1997-04-23 210643.96 794.47 CANADA
11 Customer#000000148 1997-07-25 206179.68 2135.6 IRAQ
2 Customer#000000101 1997-07-28 204163.1 7470.96 BRAZIL
3 Customer#000000005 1997-11-09 190142.17 794.47 CANADA
9 Customer#000000094 1997-11-30 187516.29 5500.11 INDONESIA
3 Customer#000000005 1997-11-12 185496.66 794.47 CANADA
set use_sort_nest=0;
explain SELECT
c_nationkey, c_name, o_orderDate, o_totalprice, c_acctbal, n_name
FROM
......@@ -213,56 +122,6 @@ c_nationkey c_name o_orderDate o_totalprice c_acctbal n_name
#
# Filesort on first table (lineitem)
#
show create table orders;
Table Create Table
orders CREATE TABLE `orders` (
`o_orderkey` int(11) NOT NULL,
`o_custkey` int(11) DEFAULT NULL,
`o_orderstatus` char(1) DEFAULT NULL,
`o_totalprice` double DEFAULT NULL,
`o_orderDATE` date DEFAULT NULL,
`o_orderpriority` char(15) DEFAULT NULL,
`o_clerk` char(15) DEFAULT NULL,
`o_shippriority` int(11) DEFAULT NULL,
`o_comment` varchar(79) DEFAULT NULL,
PRIMARY KEY (`o_orderkey`),
KEY `i_o_orderdate` (`o_orderDATE`),
KEY `i_o_custkey` (`o_custkey`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
set use_sort_nest=1;
explain SELECT
l_extendedprice, o_orderkey, o_totalprice, l_shipDATE
FROM
orders, lineitem
WHERE
o_orderkey = l_orderkey AND
l_shipDATE >= '1996-01-01' AND l_shipDATE <= '1996-12-31'
ORDER BY l_extendedprice DESC
LIMIT 10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE lineitem range PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity i_l_shipdate 4 NULL 910 Using index condition; Using filesort
1 SIMPLE orders eq_ref PRIMARY PRIMARY 4 dbt3.lineitem.l_orderkey 1
SELECT
l_extendedprice, o_orderkey, o_totalprice, l_shipDATE
FROM
orders, lineitem
WHERE
o_orderkey = l_orderkey AND
l_shipDATE >= '1996-01-01' AND l_shipDATE <= '1996-12-31'
ORDER BY l_extendedprice DESC
LIMIT 10;
l_extendedprice o_orderkey o_totalprice l_shipDATE
54559.5 1574 179923.54 1996-12-14
53508.5 2342 104038.78 1996-08-28
53458 1153 220727.97 1996-06-27
53075.82 2721 59180.25 1996-02-14
52830.33 1284 106122.38 1996-04-11
52657.5 2276 141159.63 1996-07-13
52290.84 4773 196080.26 1996-01-26
51752.16 1607 166335.03 1996-02-22
51751.35 1700 89143.36 1996-09-26
51709.4 1254 94649.25 1996-03-07
set use_sort_nest=0;
explain SELECT
l_extendedprice, o_orderkey, o_totalprice, l_shipDATE
FROM
......@@ -301,7 +160,6 @@ l_extendedprice o_orderkey o_totalprice l_shipDATE
#
# FILESORT USING SORT-NEST on (orders, customer)
#
set use_sort_nest=1;
explain SELECT
c_nationkey, c_name, o_orderDate, o_totalprice, c_acctbal, n_name
FROM
......@@ -336,98 +194,9 @@ c_nationkey c_name o_orderDate o_totalprice c_acctbal n_name
11 Customer#000000148 1997-07-25 206179.68 2135.6 IRAQ
18 Customer#000000082 1997-07-20 15082.82 9468.34 CHINA
10 Customer#000000055 1997-07-16 46380.69 4572.11 IRAN
set use_sort_nest=0;
explain SELECT
c_nationkey, c_name, o_orderDate, o_totalprice, c_acctbal, n_name
FROM
orders, customer, nation
WHERE
c_custkey= o_custkey AND c_nationkey=n_nationkey AND
o_orderDATE >='1997-07-01' and o_orderDATE <= '1997-07-31'
ORDER BY o_orderDATE DESC, c_acctbal DESC
LIMIT 10;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE orders range i_o_orderdate,i_o_custkey i_o_orderdate 4 NULL 20 Using index condition; Using where; Using temporary; Using filesort
1 SIMPLE customer eq_ref PRIMARY,i_c_nationkey PRIMARY 4 dbt3.orders.o_custkey 1 Using where
1 SIMPLE nation eq_ref PRIMARY PRIMARY 4 dbt3.customer.c_nationkey 1
SELECT
c_nationkey, c_name, o_orderDate, o_totalprice, c_acctbal, n_name
FROM
orders, customer, nation
WHERE
c_custkey= o_custkey AND c_nationkey=n_nationkey AND
o_orderDATE >='1997-07-01' and o_orderDATE <= '1997-07-31'
ORDER BY o_orderDATE DESC, c_acctbal DESC
LIMIT 10;
c_nationkey c_name o_orderDate o_totalprice c_acctbal n_name
2 Customer#000000101 1997-07-31 79189.58 7470.96 BRAZIL
3 Customer#000000013 1997-07-31 125188.72 3857.34 CANADA
9 Customer#000000130 1997-07-30 67979.49 5073.58 INDONESIA
11 Customer#000000148 1997-07-29 88448.24 2135.6 IRAQ
2 Customer#000000101 1997-07-28 204163.1 7470.96 BRAZIL
11 Customer#000000052 1997-07-28 46393.97 5630.28 IRAQ
4 Customer#000000004 1997-07-25 11405.4 2866.83 EGYPT
11 Customer#000000148 1997-07-25 206179.68 2135.6 IRAQ
18 Customer#000000082 1997-07-20 15082.82 9468.34 CHINA
10 Customer#000000055 1997-07-16 46380.69 4572.11 IRAN
#
# Sort-nest on table (lineitem, customer)
# Sort-nest on table (lineitem, orders)
#
set use_sort_nest=1;
explain SELECT
c_acctbal, c_name, o_orderDate, l_extendedprice, l_orderkey
FROM
orders, customer, lineitem
WHERE
c_custkey= o_custkey
AND
l_orderkey = o_orderkey
AND
l_orderkey between 5500 AND 6000
AND
l_shipDATE >= '1997-01-01' and l_shipDATE <= '1998-08-10'
ORDER BY l_extendedprice DESC, c_acctbal DESC
LIMIT 20;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE orders range PRIMARY,i_o_custkey PRIMARY 4 NULL 125 Using where; Using temporary; Using filesort
1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 dbt3.orders.o_orderkey 4 Using where
1 SIMPLE customer eq_ref PRIMARY PRIMARY 4 dbt3.orders.o_custkey 1
SELECT
c_acctbal, c_name, o_orderDate, l_extendedprice, l_orderkey
FROM
orders, customer, lineitem
WHERE
c_custkey= o_custkey
AND
l_orderkey = o_orderkey
AND
l_orderkey between 5500 AND 6000
AND
l_shipDATE >= '1997-01-01' and l_shipDATE <= '1998-08-10'
ORDER BY l_extendedprice DESC, c_acctbal DESC
LIMIT 20;
c_acctbal c_name o_orderDate l_extendedprice l_orderkey
1842.49 Customer#000000124 1997-11-06 54759.5 5857
2135.6 Customer#000000148 1997-04-14 53909.8 5952
4681.03 Customer#000000016 1998-07-06 53811.31 5761
794.47 Customer#000000005 1997-04-23 53758.5 5859
-234.12 Customer#000000125 1997-01-11 53468.31 5829
5121.28 Customer#000000079 1998-05-31 53208 5633
5744.59 Customer#000000046 1998-04-14 50770.37 5604
-917.75 Customer#000000037 1997-07-13 50310.72 5793
121.65 Customer#000000002 1998-05-28 49830.24 5507
121.65 Customer#000000002 1998-05-28 49542.24 5507
7470.96 Customer#000000101 1997-05-27 49411.82 5923
5327.38 Customer#000000095 1997-10-04 48859.36 5505
1842.49 Customer#000000124 1997-11-06 48661.41 5857
4573.94 Customer#000000049 1997-02-14 48557.11 5762
-646.64 Customer#000000064 1997-01-01 48219.92 5895
-646.64 Customer#000000064 1997-01-01 48039.64 5895
5121.28 Customer#000000079 1998-05-31 48004.8 5633
9904.28 Customer#000000043 1998-02-06 47339.52 5671
8959.65 Customer#000000149 1996-11-12 47247.52 5606
5744.59 Customer#000000046 1998-04-14 45589.72 5604
set use_sort_nest=0;
explain SELECT
c_acctbal, c_name, o_orderDate, l_extendedprice, l_orderkey
FROM
......@@ -440,12 +209,13 @@ AND
l_orderkey between 5500 AND 6000
AND
l_shipDATE >= '1997-01-01' and l_shipDATE <= '1998-08-10'
ORDER BY l_extendedprice DESC, c_acctbal DESC
ORDER BY l_extendedprice DESC, o_orderDATE DESC
LIMIT 20;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE orders range PRIMARY,i_o_custkey PRIMARY 4 NULL 125 Using where; Using temporary; Using filesort
1 SIMPLE customer eq_ref PRIMARY PRIMARY 4 dbt3.orders.o_custkey 1
1 SIMPLE orders range PRIMARY,i_o_custkey PRIMARY 4 NULL 125 Using where
1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 dbt3.orders.o_orderkey 4 Using where
1 SIMPLE <sort-nest> ALL NULL NULL NULL NULL 20 Using filesort
1 SIMPLE customer eq_ref PRIMARY PRIMARY 4 sort-nest.o_custkey 1
SELECT
c_acctbal, c_name, o_orderDate, l_extendedprice, l_orderkey
FROM
......@@ -458,7 +228,7 @@ AND
l_orderkey between 5500 AND 6000
AND
l_shipDATE >= '1997-01-01' and l_shipDATE <= '1998-08-10'
ORDER BY l_extendedprice DESC, c_acctbal DESC
ORDER BY l_extendedprice DESC, o_orderDATE DESC
LIMIT 20;
c_acctbal c_name o_orderDate l_extendedprice l_orderkey
1842.49 Customer#000000124 1997-11-06 54759.5 5857
......@@ -481,11 +251,9 @@ c_acctbal c_name o_orderDate l_extendedprice l_orderkey
9904.28 Customer#000000043 1998-02-06 47339.52 5671
8959.65 Customer#000000149 1996-11-12 47247.52 5606
5744.59 Customer#000000046 1998-04-14 45589.72 5604
########################################################################
#
# Sort-nest on table (customer, orders, lineitem)
#
set use_sort_nest=1;
explain SELECT
l_extendedprice, c_acctbal, o_totalprice, o_orderDate, l_orderkey
FROM
......@@ -547,65 +315,4 @@ l_extendedprice c_acctbal o_totalprice o_orderDate l_orderkey
28948.59 6819.74 182966.39 1994-07-17 5572
26732.43 9561.95 101429.61 1993-04-21 5670
24590.68 9561.95 95312.81 1992-03-28 5953
set use_sort_nest=0;
explain SELECT
l_extendedprice, c_acctbal, o_totalprice, o_orderDate, l_orderkey
FROM
orders, customer, lineitem, nation
WHERE
c_custkey= o_custkey
AND
l_orderkey = o_orderkey
AND
n_nationkey = c_nationkey
AND
l_orderkey between 5500 AND 6000
AND
c_custkey between 1 and 10
ORDER BY
l_extendedprice DESC, c_acctbal DESC, o_totalprice DESC
LIMIT 20;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE orders range PRIMARY,i_o_custkey PRIMARY 4 NULL 125 Using where; Using temporary; Using filesort
1 SIMPLE customer eq_ref PRIMARY,i_c_nationkey PRIMARY 4 dbt3.orders.o_custkey 1 Using where
1 SIMPLE nation eq_ref PRIMARY PRIMARY 4 dbt3.customer.c_nationkey 1 Using index
1 SIMPLE lineitem ref PRIMARY,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 dbt3.orders.o_orderkey 4
SELECT
l_extendedprice, c_acctbal, o_totalprice, o_orderDate, l_orderkey
FROM
orders, customer, lineitem, nation
WHERE
c_custkey= o_custkey
AND
l_orderkey = o_orderkey
AND
n_nationkey = c_nationkey
AND
l_orderkey between 5500 AND 6000
AND
c_custkey between 1 and 10
ORDER BY
l_extendedprice DESC, c_acctbal DESC, o_totalprice DESC
LIMIT 20;
l_extendedprice c_acctbal o_totalprice o_orderDate l_orderkey
53758.5 794.47 210643.96 1997-04-23 5859
49830.24 121.65 140363.7 1998-05-28 5507
49542.24 121.65 140363.7 1998-05-28 5507
48745.11 6819.74 122823.78 1993-04-05 5794
47992.64 6819.74 140838.11 1998-06-26 5763
47615.98 6819.74 182966.39 1994-07-17 5572
46705.74 9561.95 101429.61 1993-04-21 5670
44467.59 121.65 44777.63 1992-07-08 5893
44442.3 6819.74 122823.78 1993-04-05 5794
39723.6 794.47 210643.96 1997-04-23 5859
37048.32 9561.95 95312.81 1992-03-28 5953
36860.25 794.47 210643.96 1997-04-23 5859
32996.16 6819.74 140838.11 1998-06-26 5763
31416.68 6819.74 182966.39 1994-07-17 5572
31219.32 794.47 210643.96 1997-04-23 5859
31042.34 9561.95 95312.81 1992-03-28 5953
29462.13 794.47 210643.96 1997-04-23 5859
28948.59 6819.74 182966.39 1994-07-17 5572
26732.43 9561.95 101429.61 1993-04-21 5670
24590.68 9561.95 95312.81 1992-03-28 5953
drop database dbt3;
sql/sql_priv.h
View file @ 23476afd
......@@ -230,6 +230,7 @@
#define OPTIMIZER_SWITCH_USE_ROWID_FILTER (1ULL << 33)
#define OPTIMIZER_SWITCH_COND_PUSHDOWN_FROM_HAVING (1ULL << 34)
#define OPTIMIZER_SWITCH_NOT_NULL_RANGE_SCAN (1ULL << 35)
#define OPTIMIZER_SWITCH_COST_BASED_ORDER_BY_LIMIT (1ULL << 36)
#define OPTIMIZER_SWITCH_DEFAULT (OPTIMIZER_SWITCH_INDEX_MERGE | \
OPTIMIZER_SWITCH_INDEX_MERGE_UNION | \
......
sql/sql_sort_nest.cc
View file @ 23476afd
......@@ -1407,7 +1407,8 @@ void JOIN::set_fraction_output_for_nest()
bool JOIN::sort_nest_allowed()
{
return thd->variables.use_sort_nest && order &&
return optimizer_flag(thd, OPTIMIZER_SWITCH_COST_BASED_ORDER_BY_LIMIT) &&
order &&
!(const_tables == table_count ||
(select_distinct || group_list) ||
having ||
......
sql/sys_vars.cc
View file @ 23476afd
......@@ -2590,6 +2590,7 @@ export const char *optimizer_switch_names[]=
"rowid_filter",
"condition_pushdown_from_having",
"not_null_range_scan",
"cost_based_order_by_limit",
"default",
NullS
};
......@@ -6438,9 +6439,3 @@ static Sys_var_ulonglong Sys_max_rowid_filter_size(
SESSION_VAR(max_rowid_filter_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1024, (ulonglong)~(intptr)0), DEFAULT(128*1024),
BLOCK_SIZE(1));
static Sys_var_mybool Sys_use_sort_nest(
"use_sort_nest",
"Enable the sort nest",
SESSION_VAR(use_sort_nest), CMD_LINE(OPT_ARG),
DEFAULT(FALSE));
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