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Commit c8ce9fbb authored by Oleg Smirnov's avatar Oleg Smirnov
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MDEV-33281 Make BNL() hint work for join_cache_level=0 

join_cache_level=0 disables join cache buffers, but the hint
BNL() now allows to employ BNL(H) buffers for particular tables
or query blocks.

This commit also adds a number of test cases including
OUTER JOINs to make sure hints do not break the rules of
join buffers application
parent cee6796b
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mysql-test/main/opt_hints.result
View file @ c8ce9fbb
...@@ -242,9 +242,9 @@ id select_type table type possible_keys key key_len ref rows filtered Extra ...@@ -242,9 +242,9 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
Warnings: Warnings:
Note 1003 select /*+ NO_ICP(`t5`@`select#2` `y_idx`) */ `test`.`t4`.`x` AS `x`,`test`.`t5`.`y` AS `y` from `test`.`t4` join `test`.`t4` `t5` where `test`.`t4`.`y` = 8 and `test`.`t5`.`x` between 7 and <cache>(8 + 0) Note 1003 select /*+ NO_ICP(`t5`@`select#2` `y_idx`) */ `test`.`t4`.`x` AS `x`,`test`.`t5`.`y` AS `y` from `test`.`t4` join `test`.`t4` `t5` where `test`.`t4`.`y` = 8 and `test`.`t5`.`x` between 7 and <cache>(8 + 0)
# BKA & NO_BKA hint testing # BKA & NO_BKA hint testing
set optimizer_switch=default; set optimizer_switch = DEFAULT;
set optimizer_switch='mrr=on,mrr_cost_based=off'; set optimizer_switch = 'mrr=on,mrr_cost_based=off';
set join_cache_level=6; set join_cache_level = 8;
CREATE TABLE t10(a INT); CREATE TABLE t10(a INT);
INSERT INTO t10 VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); INSERT INTO t10 VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
CREATE TABLE t11(a INT); CREATE TABLE t11(a INT);
...@@ -258,7 +258,7 @@ EXPLAIN ...@@ -258,7 +258,7 @@ EXPLAIN
SELECT * FROM t12, t13 WHERE t12.a=t13.a AND (t13.b+1 <= t13.b+1); SELECT * FROM t12, t13 WHERE t12.a=t13.a AND (t13.b+1 <= t13.b+1);
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t12 ALL NULL NULL NULL NULL 10 Using where 1 SIMPLE t12 ALL NULL NULL NULL NULL 10 Using where
1 SIMPLE t13 ref a a 5 test.t12.a 1 Using index condition; Using join buffer (flat, BKA join); Rowid-ordered scan 1 SIMPLE t13 ref a a 5 test.t12.a 1 Using index condition; Using where; Using join buffer (flat, BKAH join); Rowid-ordered scan
# Disable BKA # Disable BKA
set optimizer_switch='join_cache_bka=off'; set optimizer_switch='join_cache_bka=off';
EXPLAIN EXTENDED EXPLAIN EXTENDED
...@@ -322,21 +322,21 @@ EXPLAIN EXTENDED SELECT /*+ BKA(t13) */ * FROM t12, t13 ...@@ -322,21 +322,21 @@ EXPLAIN EXTENDED SELECT /*+ BKA(t13) */ * FROM t12, t13
WHERE t12.a=t13.a AND (t13.b+1 <= t13.b+1); WHERE t12.a=t13.a AND (t13.b+1 <= t13.b+1);
id select_type table type possible_keys key key_len ref rows filtered Extra id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t12 ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE t12 ALL NULL NULL NULL NULL 10 100.00 Using where
1 SIMPLE t13 ref a a 5 test.t12.a 1 100.00 Using index condition; Using join buffer (flat, BKA join); Rowid-ordered scan 1 SIMPLE t13 ref a a 5 test.t12.a 1 100.00 Using index condition; Using where; Using join buffer (flat, BKAH join); Rowid-ordered scan
Warnings: Warnings:
Note 1003 select /*+ BKA(`t13`@`select#1`) */ `test`.`t12`.`a` AS `a`,`test`.`t12`.`b` AS `b`,`test`.`t13`.`a` AS `a`,`test`.`t13`.`b` AS `b`,`test`.`t13`.`c` AS `c`,`test`.`t13`.`filler` AS `filler` from `test`.`t12` join `test`.`t13` where `test`.`t13`.`a` = `test`.`t12`.`a` and `test`.`t13`.`b` + 1 <= `test`.`t13`.`b` + 1 Note 1003 select /*+ BKA(`t13`@`select#1`) */ `test`.`t12`.`a` AS `a`,`test`.`t12`.`b` AS `b`,`test`.`t13`.`a` AS `a`,`test`.`t13`.`b` AS `b`,`test`.`t13`.`c` AS `c`,`test`.`t13`.`filler` AS `filler` from `test`.`t12` join `test`.`t13` where `test`.`t13`.`a` = `test`.`t12`.`a` and `test`.`t13`.`b` + 1 <= `test`.`t13`.`b` + 1
EXPLAIN EXTENDED SELECT /*+ BKA() */ * FROM t12, t13 EXPLAIN EXTENDED SELECT /*+ BKA() */ * FROM t12, t13
WHERE t12.a=t13.a AND (t13.b+1 <= t13.b+1); WHERE t12.a=t13.a AND (t13.b+1 <= t13.b+1);
id select_type table type possible_keys key key_len ref rows filtered Extra id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t12 ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE t12 ALL NULL NULL NULL NULL 10 100.00 Using where
1 SIMPLE t13 ref a a 5 test.t12.a 1 100.00 Using index condition; Using join buffer (flat, BKA join); Rowid-ordered scan 1 SIMPLE t13 ref a a 5 test.t12.a 1 100.00 Using index condition; Using where; Using join buffer (flat, BKAH join); Rowid-ordered scan
Warnings: Warnings:
Note 1003 select /*+ BKA(@`select#1`) */ `test`.`t12`.`a` AS `a`,`test`.`t12`.`b` AS `b`,`test`.`t13`.`a` AS `a`,`test`.`t13`.`b` AS `b`,`test`.`t13`.`c` AS `c`,`test`.`t13`.`filler` AS `filler` from `test`.`t12` join `test`.`t13` where `test`.`t13`.`a` = `test`.`t12`.`a` and `test`.`t13`.`b` + 1 <= `test`.`t13`.`b` + 1 Note 1003 select /*+ BKA(@`select#1`) */ `test`.`t12`.`a` AS `a`,`test`.`t12`.`b` AS `b`,`test`.`t13`.`a` AS `a`,`test`.`t13`.`b` AS `b`,`test`.`t13`.`c` AS `c`,`test`.`t13`.`filler` AS `filler` from `test`.`t12` join `test`.`t13` where `test`.`t13`.`a` = `test`.`t12`.`a` and `test`.`t13`.`b` + 1 <= `test`.`t13`.`b` + 1
EXPLAIN EXTENDED SELECT /*+ BKA(t12, t13) */ * FROM t12, t13 EXPLAIN EXTENDED SELECT /*+ BKA(t12, t13) */ * FROM t12, t13
WHERE t12.a=t13.a AND (t13.b+1 <= t13.b+1); WHERE t12.a=t13.a AND (t13.b+1 <= t13.b+1);
id select_type table type possible_keys key key_len ref rows filtered Extra id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t12 ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE t12 ALL NULL NULL NULL NULL 10 100.00 Using where
1 SIMPLE t13 ref a a 5 test.t12.a 1 100.00 Using index condition; Using join buffer (flat, BKA join); Rowid-ordered scan 1 SIMPLE t13 ref a a 5 test.t12.a 1 100.00 Using index condition; Using where; Using join buffer (flat, BKAH join); Rowid-ordered scan
Warnings: Warnings:
Note 1003 select /*+ BKA(`t12`@`select#1`) BKA(`t13`@`select#1`) */ `test`.`t12`.`a` AS `a`,`test`.`t12`.`b` AS `b`,`test`.`t13`.`a` AS `a`,`test`.`t13`.`b` AS `b`,`test`.`t13`.`c` AS `c`,`test`.`t13`.`filler` AS `filler` from `test`.`t12` join `test`.`t13` where `test`.`t13`.`a` = `test`.`t12`.`a` and `test`.`t13`.`b` + 1 <= `test`.`t13`.`b` + 1 Note 1003 select /*+ BKA(`t12`@`select#1`) BKA(`t13`@`select#1`) */ `test`.`t12`.`a` AS `a`,`test`.`t12`.`b` AS `b`,`test`.`t13`.`a` AS `a`,`test`.`t13`.`b` AS `b`,`test`.`t13`.`c` AS `c`,`test`.`t13`.`filler` AS `filler` from `test`.`t12` join `test`.`t13` where `test`.`t13`.`a` = `test`.`t12`.`a` and `test`.`t13`.`b` + 1 <= `test`.`t13`.`b` + 1
EXPLAIN EXTENDED SELECT /*+ BKA(t12) */ * FROM t12, t13 EXPLAIN EXTENDED SELECT /*+ BKA(t12) */ * FROM t12, t13
...@@ -350,7 +350,7 @@ EXPLAIN EXTENDED SELECT /*+ QB_NAME(QB1) BKA(t13@QB1) */ * FROM t12, t13 ...@@ -350,7 +350,7 @@ EXPLAIN EXTENDED SELECT /*+ QB_NAME(QB1) BKA(t13@QB1) */ * FROM t12, t13
WHERE t12.a=t13.a AND (t13.b+1 <= t13.b+1); WHERE t12.a=t13.a AND (t13.b+1 <= t13.b+1);
id select_type table type possible_keys key key_len ref rows filtered Extra id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t12 ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE t12 ALL NULL NULL NULL NULL 10 100.00 Using where
1 SIMPLE t13 ref a a 5 test.t12.a 1 100.00 Using index condition; Using join buffer (flat, BKA join); Rowid-ordered scan 1 SIMPLE t13 ref a a 5 test.t12.a 1 100.00 Using index condition; Using where; Using join buffer (flat, BKAH join); Rowid-ordered scan
Warnings: Warnings:
Note 1003 select /*+ QB_NAME(`QB1`) BKA(`t13`@`QB1`) */ `test`.`t12`.`a` AS `a`,`test`.`t12`.`b` AS `b`,`test`.`t13`.`a` AS `a`,`test`.`t13`.`b` AS `b`,`test`.`t13`.`c` AS `c`,`test`.`t13`.`filler` AS `filler` from `test`.`t12` join `test`.`t13` where `test`.`t13`.`a` = `test`.`t12`.`a` and `test`.`t13`.`b` + 1 <= `test`.`t13`.`b` + 1 Note 1003 select /*+ QB_NAME(`QB1`) BKA(`t13`@`QB1`) */ `test`.`t12`.`a` AS `a`,`test`.`t12`.`b` AS `b`,`test`.`t13`.`a` AS `a`,`test`.`t13`.`b` AS `b`,`test`.`t13`.`c` AS `c`,`test`.`t13`.`filler` AS `filler` from `test`.`t12` join `test`.`t13` where `test`.`t13`.`a` = `test`.`t12`.`a` and `test`.`t13`.`b` + 1 <= `test`.`t13`.`b` + 1
# Enable BKA # Enable BKA
...@@ -380,7 +380,7 @@ EXPLAIN EXTENDED SELECT /*+ NO_BKA(t12) */ * FROM t12, t13 ...@@ -380,7 +380,7 @@ EXPLAIN EXTENDED SELECT /*+ NO_BKA(t12) */ * FROM t12, t13
WHERE t12.a=t13.a AND (t13.b+1 <= t13.b+1); WHERE t12.a=t13.a AND (t13.b+1 <= t13.b+1);
id select_type table type possible_keys key key_len ref rows filtered Extra id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t12 ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE t12 ALL NULL NULL NULL NULL 10 100.00 Using where
1 SIMPLE t13 ref a a 5 test.t12.a 1 100.00 Using index condition; Using join buffer (flat, BKA join); Rowid-ordered scan 1 SIMPLE t13 ref a a 5 test.t12.a 1 100.00 Using index condition; Using where; Using join buffer (flat, BKAH join); Rowid-ordered scan
Warnings: Warnings:
Note 1003 select /*+ NO_BKA(`t12`@`select#1`) */ `test`.`t12`.`a` AS `a`,`test`.`t12`.`b` AS `b`,`test`.`t13`.`a` AS `a`,`test`.`t13`.`b` AS `b`,`test`.`t13`.`c` AS `c`,`test`.`t13`.`filler` AS `filler` from `test`.`t12` join `test`.`t13` where `test`.`t13`.`a` = `test`.`t12`.`a` and `test`.`t13`.`b` + 1 <= `test`.`t13`.`b` + 1 Note 1003 select /*+ NO_BKA(`t12`@`select#1`) */ `test`.`t12`.`a` AS `a`,`test`.`t12`.`b` AS `b`,`test`.`t13`.`a` AS `a`,`test`.`t13`.`b` AS `b`,`test`.`t13`.`c` AS `c`,`test`.`t13`.`filler` AS `filler` from `test`.`t12` join `test`.`t13` where `test`.`t13`.`a` = `test`.`t12`.`a` and `test`.`t13`.`b` + 1 <= `test`.`t13`.`b` + 1
EXPLAIN EXTENDED SELECT /*+ QB_NAME(QB1) NO_BKA(t13@QB1) */ * FROM t12, t13 EXPLAIN EXTENDED SELECT /*+ QB_NAME(QB1) NO_BKA(t13@QB1) */ * FROM t12, t13
...@@ -563,7 +563,7 @@ EXPLAIN EXTENDED SELECT /*+ BKA(tbl12, tbl13) */ * FROM t12 tbl12, t13 tbl13 ...@@ -563,7 +563,7 @@ EXPLAIN EXTENDED SELECT /*+ BKA(tbl12, tbl13) */ * FROM t12 tbl12, t13 tbl13
WHERE tbl12.a=tbl13.a AND (tbl13.b+1 <= tbl13.b+1); WHERE tbl12.a=tbl13.a AND (tbl13.b+1 <= tbl13.b+1);
id select_type table type possible_keys key key_len ref rows filtered Extra id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE tbl12 ALL NULL NULL NULL NULL 10 100.00 Using where 1 SIMPLE tbl12 ALL NULL NULL NULL NULL 10 100.00 Using where
1 SIMPLE tbl13 ref a a 5 test.tbl12.a 1 100.00 Using index condition; Using join buffer (flat, BKA join); Rowid-ordered scan 1 SIMPLE tbl13 ref a a 5 test.tbl12.a 1 100.00 Using index condition; Using where; Using join buffer (flat, BKAH join); Rowid-ordered scan
Warnings: Warnings:
Note 1003 select /*+ BKA(`tbl12`@`select#1`) BKA(`tbl13`@`select#1`) */ `test`.`tbl12`.`a` AS `a`,`test`.`tbl12`.`b` AS `b`,`test`.`tbl13`.`a` AS `a`,`test`.`tbl13`.`b` AS `b`,`test`.`tbl13`.`c` AS `c`,`test`.`tbl13`.`filler` AS `filler` from `test`.`t12` `tbl12` join `test`.`t13` `tbl13` where `test`.`tbl13`.`a` = `test`.`tbl12`.`a` and `test`.`tbl13`.`b` + 1 <= `test`.`tbl13`.`b` + 1 Note 1003 select /*+ BKA(`tbl12`@`select#1`) BKA(`tbl13`@`select#1`) */ `test`.`tbl12`.`a` AS `a`,`test`.`tbl12`.`b` AS `b`,`test`.`tbl13`.`a` AS `a`,`test`.`tbl13`.`b` AS `b`,`test`.`tbl13`.`c` AS `c`,`test`.`tbl13`.`filler` AS `filler` from `test`.`t12` `tbl12` join `test`.`t13` `tbl13` where `test`.`tbl13`.`a` = `test`.`tbl12`.`a` and `test`.`tbl13`.`b` + 1 <= `test`.`tbl13`.`b` + 1
# Print warnings for nonexistent names # Print warnings for nonexistent names
...@@ -692,7 +692,9 @@ Handler_read_rnd_deleted 0 ...@@ -692,7 +692,9 @@ Handler_read_rnd_deleted 0
Handler_read_rnd_next 11 Handler_read_rnd_next 11
DEALLOCATE PREPARE stmt1; DEALLOCATE PREPARE stmt1;
DROP TABLE t1, t2, t3, t10, t11, t12, t13; DROP TABLE t1, t2, t3, t10, t11, t12, t13;
# BNL & NO_BNL hint testing #
# BNL and NO_BNL hint testing
#
set optimizer_switch=default; set optimizer_switch=default;
CREATE TABLE t1 (a INT, b INT); CREATE TABLE t1 (a INT, b INT);
INSERT INTO t1 VALUES (1,1),(2,2); INSERT INTO t1 VALUES (1,1),(2,2);
...@@ -774,14 +776,54 @@ id select_type table type possible_keys key key_len ref rows filtered Extra ...@@ -774,14 +776,54 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00
Warnings: Warnings:
Note 1003 select /*+ NO_BNL(`t1`@`select#1`) NO_BNL(`t3`@`select#1`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` join `test`.`t2` join `test`.`t3` Note 1003 select /*+ NO_BNL(`t1`@`select#1`) NO_BNL(`t3`@`select#1`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` join `test`.`t2` join `test`.`t3`
# MariaDB does not have optimizer_switch='block_nested_loop=off' # Make sure query results are the same for any hints combination
# as MySQL does, so in fact we cannot disable BNL join. The cases below SELECT * FROM t1,t2,t3;
# test the BNL() hint, although it does not affect the execution plan a b a b a b
1 1 1 1 1 1
1 1 1 1 2 2
1 1 2 2 1 1
1 1 2 2 2 2
2 2 1 1 1 1
2 2 1 1 2 2
2 2 2 2 1 1
2 2 2 2 2 2
SELECT /*+ NO_BNL(t1, t2) */* FROM t1,t2,t3;
a b a b a b
1 1 1 1 1 1
1 1 1 1 2 2
1 1 2 2 1 1
1 1 2 2 2 2
2 2 1 1 1 1
2 2 1 1 2 2
2 2 2 2 1 1
2 2 2 2 2 2
SELECT /*+ NO_BNL(t1, t3) */* FROM t1,t2,t3;
a b a b a b
1 1 1 1 1 1
1 1 1 1 2 2
1 1 2 2 1 1
1 1 2 2 2 2
2 2 1 1 1 1
2 2 1 1 2 2
2 2 2 2 1 1
2 2 2 2 2 2
SELECT /*+ NO_BNL(t2, t3) */* FROM t1,t2,t3;
a b a b a b
1 1 1 1 1 1
1 1 1 1 2 2
1 1 2 2 1 1
1 1 2 2 2 2
2 2 1 1 1 1
2 2 1 1 2 2
2 2 2 2 1 1
2 2 2 2 2 2
# BNL() overrides current join_cache_level setting
set join_cache_level = 0;
EXPLAIN EXTENDED SELECT t1.* FROM t1,t2,t3; EXPLAIN EXTENDED SELECT t1.* FROM t1,t2,t3;
id select_type table type possible_keys key key_len ref rows filtered Extra id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00
1 SIMPLE t2 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (flat, BNL join) 1 SIMPLE t2 ALL NULL NULL NULL NULL 2 100.00
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (incremental, BNL join) 1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00
Warnings: Warnings:
Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` join `test`.`t2` join `test`.`t3` Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` join `test`.`t2` join `test`.`t3`
EXPLAIN EXTENDED SELECT /*+ BNL() */t1.* FROM t1,t2,t3; EXPLAIN EXTENDED SELECT /*+ BNL() */t1.* FROM t1,t2,t3;
...@@ -791,20 +833,27 @@ id select_type table type possible_keys key key_len ref rows filtered Extra ...@@ -791,20 +833,27 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (incremental, BNL join) 1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (incremental, BNL join)
Warnings: Warnings:
Note 1003 select /*+ BNL(@`select#1`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` join `test`.`t2` join `test`.`t3` Note 1003 select /*+ BNL(@`select#1`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` join `test`.`t2` join `test`.`t3`
EXPLAIN EXTENDED SELECT /*+ BNL(t2, t3) */t1.* FROM t1,t2,t3; EXPLAIN EXTENDED SELECT /*+ BNL(t1, t2) */t1.* FROM t1,t2,t3;
id select_type table type possible_keys key key_len ref rows filtered Extra id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00
1 SIMPLE t2 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (flat, BNL join) 1 SIMPLE t2 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (flat, BNL join)
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (incremental, BNL join) 1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00
Warnings: Warnings:
Note 1003 select /*+ BNL(`t2`@`select#1`) BNL(`t3`@`select#1`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` join `test`.`t2` join `test`.`t3` Note 1003 select /*+ BNL(`t1`@`select#1`) BNL(`t2`@`select#1`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` join `test`.`t2` join `test`.`t3`
EXPLAIN EXTENDED SELECT /*+ BNL(t1, t3) */t1.* FROM t1,t2,t3; EXPLAIN EXTENDED SELECT /*+ BNL(t1, t3) */t1.* FROM t1,t2,t3;
id select_type table type possible_keys key key_len ref rows filtered Extra id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00
1 SIMPLE t2 ALL NULL NULL NULL NULL 2 100.00
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (flat, BNL join)
Warnings:
Note 1003 select /*+ BNL(`t1`@`select#1`) BNL(`t3`@`select#1`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` join `test`.`t2` join `test`.`t3`
EXPLAIN EXTENDED SELECT /*+ BNL(t2, t3) */t1.* FROM t1,t2,t3;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00
1 SIMPLE t2 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (flat, BNL join) 1 SIMPLE t2 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (flat, BNL join)
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (incremental, BNL join) 1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (incremental, BNL join)
Warnings: Warnings:
Note 1003 select /*+ BNL(`t1`@`select#1`) BNL(`t3`@`select#1`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` join `test`.`t2` join `test`.`t3` Note 1003 select /*+ BNL(`t2`@`select#1`) BNL(`t3`@`select#1`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` join `test`.`t2` join `test`.`t3`
EXPLAIN EXTENDED SELECT /*+ BNL(t2) BNL(t3) */t1.* FROM t1,t2,t3; EXPLAIN EXTENDED SELECT /*+ BNL(t2) BNL(t3) */t1.* FROM t1,t2,t3;
id select_type table type possible_keys key key_len ref rows filtered Extra id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00 1 SIMPLE t1 ALL NULL NULL NULL NULL 2 100.00
...@@ -813,6 +862,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra ...@@ -813,6 +862,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
Warnings: Warnings:
Note 1003 select /*+ BNL(`t2`@`select#1`) BNL(`t3`@`select#1`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` join `test`.`t2` join `test`.`t3` Note 1003 select /*+ BNL(`t2`@`select#1`) BNL(`t3`@`select#1`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` join `test`.`t2` join `test`.`t3`
DROP TABLE t1, t2, t3; DROP TABLE t1, t2, t3;
set join_cache_level = 8;
# BNL in subquery # BNL in subquery
set optimizer_switch = DEFAULT; set optimizer_switch = DEFAULT;
CREATE TABLE t1 (a INT, b INT, PRIMARY KEY (a)); CREATE TABLE t1 (a INT, b INT, PRIMARY KEY (a));
...@@ -829,81 +879,373 @@ test.t2 analyze status Engine-independent statistics collected ...@@ -829,81 +879,373 @@ test.t2 analyze status Engine-independent statistics collected
test.t2 analyze status OK test.t2 analyze status OK
test.t3 analyze status Engine-independent statistics collected test.t3 analyze status Engine-independent statistics collected
test.t3 analyze status OK test.t3 analyze status OK
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) */ * FROM t1 JOIN t2 ON t1.b = t2.a WHERE EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) */ * FROM t1 JOIN t2 ON t1.a = t2.a WHERE
t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.b = t4.b); t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
id select_type table type possible_keys key key_len ref rows filtered Extra id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4 100.00 Using where 1 PRIMARY t1 ALL PRIMARY NULL NULL NULL 4 100.00
1 PRIMARY t2 hash_ALL NULL #hash#$hj 5 test.t1.b 4 10.00 Using where; Using join buffer (flat, BNLH join) 1 PRIMARY t2 hash_ALL NULL #hash#$hj 5 test.t1.a 4 10.00 Using where; Using join buffer (flat, BNLH join)
1 PRIMARY t3 index NULL a 10 NULL 3 10.00 Using where; Using index; Using join buffer (incremental, BNL join) 1 PRIMARY t3 index a a 10 NULL 3 10.00 Using where; Using index; Using join buffer (incremental, BNL join)
1 PRIMARY t4 ALL NULL NULL NULL NULL 4 25.00 Using where; FirstMatch(t2); Using join buffer (incremental, BNL join) 1 PRIMARY t4 ALL NULL NULL NULL NULL 4 25.00 Using where; FirstMatch(t2); Using join buffer (incremental, BNL join)
Warnings: Warnings:
Note 1003 select /*+ QB_NAME(`q`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a` from `test`.`t1` semi join (`test`.`t3` join `test`.`t1` `t4`) join `test`.`t2` where `test`.`t2`.`a` = `test`.`t1`.`b` and `test`.`t3`.`b` = `test`.`t1`.`b` and `test`.`t4`.`b` = `test`.`t1`.`b` Note 1003 select /*+ QB_NAME(`q`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a` from `test`.`t1` semi join (`test`.`t3` join `test`.`t1` `t4`) join `test`.`t2` where `test`.`t2`.`a` = `test`.`t1`.`a` and `test`.`t3`.`b` = `test`.`t1`.`a` and `test`.`t4`.`b` = `test`.`t3`.`a`
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL() */ * FROM t1 JOIN t2 ON t1.b = t2.a WHERE EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL() */ *
t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.b = t4.b); FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
id select_type table type possible_keys key key_len ref rows filtered Extra id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4 100.00 Using where 1 PRIMARY t1 ALL PRIMARY NULL NULL NULL 4 100.00
1 PRIMARY t2 hash_ALL NULL #hash#$hj 5 test.t1.b 4 10.00 Using where; Using join buffer (flat, BNLH join) 1 PRIMARY t2 ALL NULL NULL NULL NULL 4 10.00 Using where
1 PRIMARY t3 index NULL a 10 NULL 3 10.00 Using where; Using index; Using join buffer (incremental, BNL join) 1 PRIMARY t3 index a a 10 NULL 3 10.00 Using where; Using index; Using join buffer (flat, BNL join)
1 PRIMARY t4 ALL NULL NULL NULL NULL 4 25.00 Using where; FirstMatch(t2); Using join buffer (incremental, BNL join) 1 PRIMARY t4 ALL NULL NULL NULL NULL 4 25.00 Using where; FirstMatch(t2); Using join buffer (incremental, BNL join)
Warnings: Warnings:
Note 1003 select /*+ QB_NAME(`q`) NO_BNL(@`q`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a` from `test`.`t1` semi join (`test`.`t3` join `test`.`t1` `t4`) join `test`.`t2` where `test`.`t2`.`a` = `test`.`t1`.`b` and `test`.`t3`.`b` = `test`.`t1`.`b` and `test`.`t4`.`b` = `test`.`t1`.`b` Note 1003 select /*+ QB_NAME(`q`) NO_BNL(@`q`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a` from `test`.`t1` semi join (`test`.`t3` join `test`.`t1` `t4`) join `test`.`t2` where `test`.`t2`.`a` = `test`.`t1`.`a` and `test`.`t3`.`b` = `test`.`t1`.`a` and `test`.`t4`.`b` = `test`.`t3`.`a`
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL(t1, t2) */ * FROM t1 JOIN t2 ON t1.b = t2.a WHERE EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL(t1, t2) */ *
t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.b = t4.b); FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
id select_type table type possible_keys key key_len ref rows filtered Extra id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4 100.00 Using where 1 PRIMARY t1 ALL PRIMARY NULL NULL NULL 4 100.00
1 PRIMARY t2 hash_ALL NULL #hash#$hj 5 test.t1.b 4 10.00 Using where; Using join buffer (flat, BNLH join) 1 PRIMARY t2 ALL NULL NULL NULL NULL 4 10.00 Using where
1 PRIMARY t3 index NULL a 10 NULL 3 10.00 Using where; Using index; Using join buffer (incremental, BNL join) 1 PRIMARY t3 index a a 10 NULL 3 10.00 Using where; Using index; Using join buffer (flat, BNL join)
1 PRIMARY t4 ALL NULL NULL NULL NULL 4 25.00 Using where; FirstMatch(t2); Using join buffer (incremental, BNL join) 1 PRIMARY t4 ALL NULL NULL NULL NULL 4 25.00 Using where; FirstMatch(t2); Using join buffer (incremental, BNL join)
Warnings: Warnings:
Note 1003 select /*+ QB_NAME(`q`) NO_BNL(`t1`@`q`) NO_BNL(`t2`@`q`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a` from `test`.`t1` semi join (`test`.`t3` join `test`.`t1` `t4`) join `test`.`t2` where `test`.`t2`.`a` = `test`.`t1`.`b` and `test`.`t3`.`b` = `test`.`t1`.`b` and `test`.`t4`.`b` = `test`.`t1`.`b` Note 1003 select /*+ QB_NAME(`q`) NO_BNL(`t1`@`q`) NO_BNL(`t2`@`q`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a` from `test`.`t1` semi join (`test`.`t3` join `test`.`t1` `t4`) join `test`.`t2` where `test`.`t2`.`a` = `test`.`t1`.`a` and `test`.`t3`.`b` = `test`.`t1`.`a` and `test`.`t4`.`b` = `test`.`t3`.`a`
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL(@subq1) */ * FROM t1 JOIN t2 ON t1.b = t2.a WHERE EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL(@subq1) */ *
t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.b = t4.b); FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
id select_type table type possible_keys key key_len ref rows filtered Extra id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4 100.00 Using where 1 PRIMARY t1 ALL PRIMARY NULL NULL NULL 4 100.00
1 PRIMARY t2 hash_ALL NULL #hash#$hj 5 test.t1.b 4 10.00 Using where; Using join buffer (flat, BNLH join) 1 PRIMARY t2 hash_ALL NULL #hash#$hj 5 test.t1.a 4 10.00 Using where; Using join buffer (flat, BNLH join)
1 PRIMARY t3 index NULL a 10 NULL 3 10.00 Using where; Using index 1 PRIMARY t3 index a a 10 NULL 3 10.00 Using where; Using index
1 PRIMARY t4 ALL NULL NULL NULL NULL 4 25.00 Using where; FirstMatch(t2) 1 PRIMARY t4 ALL NULL NULL NULL NULL 4 25.00 Using where; FirstMatch(t2)
Warnings: Warnings:
Note 1003 select /*+ QB_NAME(`q`) NO_BNL(@`subq1`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a` from `test`.`t1` semi join (`test`.`t3` join `test`.`t1` `t4`) join `test`.`t2` where `test`.`t2`.`a` = `test`.`t1`.`b` and `test`.`t3`.`b` = `test`.`t1`.`b` and `test`.`t4`.`b` = `test`.`t1`.`b` Note 1003 select /*+ QB_NAME(`q`) NO_BNL(@`subq1`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a` from `test`.`t1` semi join (`test`.`t3` join `test`.`t1` `t4`) join `test`.`t2` where `test`.`t2`.`a` = `test`.`t1`.`a` and `test`.`t3`.`b` = `test`.`t1`.`a` and `test`.`t4`.`b` = `test`.`t3`.`a`
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL(t4@subq1) */ * FROM t1 JOIN t2 ON t1.b = t2.a WHERE EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL(t4@subq1) */ *
t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.b = t4.b); FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
id select_type table type possible_keys key key_len ref rows filtered Extra id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4 100.00 Using where 1 PRIMARY t1 ALL PRIMARY NULL NULL NULL 4 100.00
1 PRIMARY t2 hash_ALL NULL #hash#$hj 5 test.t1.b 4 10.00 Using where; Using join buffer (flat, BNLH join) 1 PRIMARY t2 hash_ALL NULL #hash#$hj 5 test.t1.a 4 10.00 Using where; Using join buffer (flat, BNLH join)
1 PRIMARY t3 index NULL a 10 NULL 3 10.00 Using where; Using index 1 PRIMARY t3 index a a 10 NULL 3 10.00 Using where; Using index
1 PRIMARY t4 ALL NULL NULL NULL NULL 4 25.00 Using where; FirstMatch(t2) 1 PRIMARY t4 ALL NULL NULL NULL NULL 4 25.00 Using where; FirstMatch(t2)
Warnings: Warnings:
Note 1003 select /*+ QB_NAME(`q`) NO_BNL(`t4`@`subq1`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a` from `test`.`t1` semi join (`test`.`t3` join `test`.`t1` `t4`) join `test`.`t2` where `test`.`t2`.`a` = `test`.`t1`.`b` and `test`.`t3`.`b` = `test`.`t1`.`b` and `test`.`t4`.`b` = `test`.`t1`.`b` Note 1003 select /*+ QB_NAME(`q`) NO_BNL(`t4`@`subq1`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a` from `test`.`t1` semi join (`test`.`t3` join `test`.`t1` `t4`) join `test`.`t2` where `test`.`t2`.`a` = `test`.`t1`.`a` and `test`.`t3`.`b` = `test`.`t1`.`a` and `test`.`t4`.`b` = `test`.`t3`.`a`
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL(t3@subq1,t4@subq1) */ * FROM t1 JOIN t2 ON t1.b = t2.a WHERE EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL(t3@subq1,t4@subq1) */ *
t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.b = t4.b); FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
id select_type table type possible_keys key key_len ref rows filtered Extra id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4 100.00 Using where 1 PRIMARY t1 ALL PRIMARY NULL NULL NULL 4 100.00
1 PRIMARY t2 hash_ALL NULL #hash#$hj 5 test.t1.b 4 10.00 Using where; Using join buffer (flat, BNLH join) 1 PRIMARY t2 hash_ALL NULL #hash#$hj 5 test.t1.a 4 10.00 Using where; Using join buffer (flat, BNLH join)
1 PRIMARY t3 index NULL a 10 NULL 3 10.00 Using where; Using index 1 PRIMARY t3 index a a 10 NULL 3 10.00 Using where; Using index
1 PRIMARY t4 ALL NULL NULL NULL NULL 4 25.00 Using where; FirstMatch(t2) 1 PRIMARY t4 ALL NULL NULL NULL NULL 4 25.00 Using where; FirstMatch(t2)
Warnings: Warnings:
Note 1003 select /*+ QB_NAME(`q`) NO_BNL(`t3`@`subq1`) NO_BNL(`t4`@`subq1`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a` from `test`.`t1` semi join (`test`.`t3` join `test`.`t1` `t4`) join `test`.`t2` where `test`.`t2`.`a` = `test`.`t1`.`b` and `test`.`t3`.`b` = `test`.`t1`.`b` and `test`.`t4`.`b` = `test`.`t1`.`b` Note 1003 select /*+ QB_NAME(`q`) NO_BNL(`t3`@`subq1`) NO_BNL(`t4`@`subq1`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a` from `test`.`t1` semi join (`test`.`t3` join `test`.`t1` `t4`) join `test`.`t2` where `test`.`t2`.`a` = `test`.`t1`.`a` and `test`.`t3`.`b` = `test`.`t1`.`a` and `test`.`t4`.`b` = `test`.`t3`.`a`
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL(@subq1 t3, t4) */ * FROM t1 JOIN t2 ON t1.b = t2.a WHERE EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL(@subq1 t3, t4) */ *
t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.b = t4.b); FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
id select_type table type possible_keys key key_len ref rows filtered Extra id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4 100.00 Using where 1 PRIMARY t1 ALL PRIMARY NULL NULL NULL 4 100.00
1 PRIMARY t2 hash_ALL NULL #hash#$hj 5 test.t1.b 4 10.00 Using where; Using join buffer (flat, BNLH join) 1 PRIMARY t2 hash_ALL NULL #hash#$hj 5 test.t1.a 4 10.00 Using where; Using join buffer (flat, BNLH join)
1 PRIMARY t3 index NULL a 10 NULL 3 10.00 Using where; Using index 1 PRIMARY t3 index a a 10 NULL 3 10.00 Using where; Using index
1 PRIMARY t4 ALL NULL NULL NULL NULL 4 25.00 Using where; FirstMatch(t2) 1 PRIMARY t4 ALL NULL NULL NULL NULL 4 25.00 Using where; FirstMatch(t2)
Warnings: Warnings:
Note 1003 select /*+ QB_NAME(`q`) NO_BNL(`t3`@`subq1`) NO_BNL(`t4`@`subq1`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a` from `test`.`t1` semi join (`test`.`t3` join `test`.`t1` `t4`) join `test`.`t2` where `test`.`t2`.`a` = `test`.`t1`.`b` and `test`.`t3`.`b` = `test`.`t1`.`b` and `test`.`t4`.`b` = `test`.`t1`.`b` Note 1003 select /*+ QB_NAME(`q`) NO_BNL(`t3`@`subq1`) NO_BNL(`t4`@`subq1`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a` from `test`.`t1` semi join (`test`.`t3` join `test`.`t1` `t4`) join `test`.`t2` where `test`.`t2`.`a` = `test`.`t1`.`a` and `test`.`t3`.`b` = `test`.`t1`.`a` and `test`.`t4`.`b` = `test`.`t3`.`a`
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) */ * FROM t1 JOIN t2 ON t1.b = t2.a WHERE EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) */ *
t2.a IN (SELECT /*+ QB_NAME(subq1) NO_BNL(t3, t4) */ t3.b FROM t3 JOIN t1 t4 ON t3.b = t4.b); FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) NO_BNL(t3, t4) */ t3.b
FROM t3 JOIN t1 t4 ON t3.a = t4.b);
id select_type table type possible_keys key key_len ref rows filtered Extra id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 4 100.00 Using where 1 PRIMARY t1 ALL PRIMARY NULL NULL NULL 4 100.00
1 PRIMARY t2 hash_ALL NULL #hash#$hj 5 test.t1.b 4 10.00 Using where; Using join buffer (flat, BNLH join) 1 PRIMARY t2 hash_ALL NULL #hash#$hj 5 test.t1.a 4 10.00 Using where; Using join buffer (flat, BNLH join)
1 PRIMARY t3 index NULL a 10 NULL 3 10.00 Using where; Using index 1 PRIMARY t3 index a a 10 NULL 3 10.00 Using where; Using index
1 PRIMARY t4 ALL NULL NULL NULL NULL 4 25.00 Using where; FirstMatch(t2) 1 PRIMARY t4 ALL NULL NULL NULL NULL 4 25.00 Using where; FirstMatch(t2)
Warnings: Warnings:
Note 1003 select /*+ QB_NAME(`q`) NO_BNL(`t3`@`subq1`) NO_BNL(`t4`@`subq1`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a` from `test`.`t1` semi join (`test`.`t3` join `test`.`t1` `t4`) join `test`.`t2` where `test`.`t2`.`a` = `test`.`t1`.`b` and `test`.`t3`.`b` = `test`.`t1`.`b` and `test`.`t4`.`b` = `test`.`t1`.`b` Note 1003 select /*+ QB_NAME(`q`) NO_BNL(`t3`@`subq1`) NO_BNL(`t4`@`subq1`) */ `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a` from `test`.`t1` semi join (`test`.`t3` join `test`.`t1` `t4`) join `test`.`t2` where `test`.`t2`.`a` = `test`.`t1`.`a` and `test`.`t3`.`b` = `test`.`t1`.`a` and `test`.`t4`.`b` = `test`.`t3`.`a`
# Make sure query results are the same for any hints combination
SELECT * FROM t1 JOIN t2 ON t1.a = t2.a WHERE
t2.a IN (SELECT t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
a b a
3 30 3
4 40 4
SELECT /*+ QB_NAME(q) */ * FROM t1 JOIN t2 ON t1.a = t2.a WHERE
t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
a b a
3 30 3
4 40 4
SELECT /*+ QB_NAME(q) NO_BNL() */ *
FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
a b a
3 30 3
4 40 4
SELECT /*+ QB_NAME(q) NO_BNL(t1, t2) */ *
FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
a b a
3 30 3
4 40 4
SELECT /*+ QB_NAME(q) NO_BNL(@subq1) */ *
FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
a b a
3 30 3
4 40 4
SELECT /*+ QB_NAME(q) NO_BNL(t4@subq1) */ *
FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
a b a
3 30 3
4 40 4
SELECT /*+ QB_NAME(q) NO_BNL(t3@subq1,t4@subq1) */ *
FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
a b a
3 30 3
4 40 4
SELECT /*+ QB_NAME(q) NO_BNL(@subq1 t3, t4) */ *
FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
a b a
3 30 3
4 40 4
SELECT /*+ QB_NAME(q) */ *
FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) NO_BNL(t3, t4) */ t3.b
FROM t3 JOIN t1 t4 ON t3.a = t4.b);
a b a
3 30 3
4 40 4
DROP TABLE t1, t2, t3, t4; DROP TABLE t1, t2, t3, t4;
#
# BNL() and NO_BNL() for LEFT JOINs
#
CREATE TABLE t1 (a int);
CREATE TABLE t2 (a int);
CREATE TABLE t3 (a int);
CREATE TABLE t4 (a int);
INSERT INTO t1 VALUES (null), (2), (null), (1);
set join_cache_level = 8;
# Two join buffers are employed by default (without hints):
EXPLAIN SELECT t1.a
FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON t2.a) ON 0
WHERE t1.a OR t3.a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4
1 SIMPLE t2 ALL NULL NULL NULL NULL 0 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t3 ALL NULL NULL NULL NULL 0 Using where; Using join buffer (incremental, BNL join)
# Disabling either of join buffers disables another one automatically due
# to join buffer employment rules:
EXPLAIN SELECT /*+ NO_BNL(t2) */ t1.a
FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON t2.a) ON 0
WHERE t1.a OR t3.a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4
1 SIMPLE t2 ALL NULL NULL NULL NULL 0 Using where
1 SIMPLE t3 ALL NULL NULL NULL NULL 0 Using where
EXPLAIN SELECT /*+ NO_BNL(t3) */ t1.a
FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON t2.a) ON 0
WHERE t1.a OR t3.a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4
1 SIMPLE t2 ALL NULL NULL NULL NULL 0 Using where
1 SIMPLE t3 ALL NULL NULL NULL NULL 0 Using where
# Three join buffers are employed here by default (without hints):
EXPLAIN SELECT t1.a
FROM t1 LEFT JOIN (t2 LEFT JOIN (t3 LEFT JOIN t4 ON 1) ON t2.a) ON 0
WHERE t1.a OR t4.a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4
1 SIMPLE t2 ALL NULL NULL NULL NULL 0 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t3 ALL NULL NULL NULL NULL 0 Using where; Using join buffer (incremental, BNL join)
1 SIMPLE t4 ALL NULL NULL NULL NULL 0 Using where; Using join buffer (incremental, BNL join)
# Disabling either of join buffers disables others automatically due
# to join buffer employment rules:
EXPLAIN SELECT /*+ NO_BNL(t2)*/ t1.a
FROM t1 LEFT JOIN (t2 LEFT JOIN (t3 LEFT JOIN t4 ON 1) ON t2.a) ON 0
WHERE t1.a OR t4.a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4
1 SIMPLE t2 ALL NULL NULL NULL NULL 0 Using where
1 SIMPLE t3 ALL NULL NULL NULL NULL 0 Using where
1 SIMPLE t4 ALL NULL NULL NULL NULL 0 Using where
EXPLAIN SELECT /*+ NO_BNL(t3)*/ t1.a
FROM t1 LEFT JOIN (t2 LEFT JOIN (t3 LEFT JOIN t4 ON 1) ON t2.a) ON 0
WHERE t1.a OR t4.a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4
1 SIMPLE t2 ALL NULL NULL NULL NULL 0 Using where
1 SIMPLE t3 ALL NULL NULL NULL NULL 0 Using where
1 SIMPLE t4 ALL NULL NULL NULL NULL 0 Using where
EXPLAIN SELECT /*+ NO_BNL(t4)*/ t1.a
FROM t1 LEFT JOIN (t2 LEFT JOIN (t3 LEFT JOIN t4 ON 1) ON t2.a) ON 0
WHERE t1.a OR t4.a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4
1 SIMPLE t2 ALL NULL NULL NULL NULL 0 Using where
1 SIMPLE t3 ALL NULL NULL NULL NULL 0 Using where
1 SIMPLE t4 ALL NULL NULL NULL NULL 0 Using where
set join_cache_level=0;
# It is not allowed to enable join buffers on some subset of inner tables
# of an outer join. Either all tables should use join buffers or none:
EXPLAIN SELECT /*+ BNL(t2)*/ t1.a
FROM t1 LEFT JOIN (t2 LEFT JOIN (t3 LEFT JOIN t4 ON 1) ON t2.a) ON 0
WHERE t1.a OR t4.a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4
1 SIMPLE t2 ALL NULL NULL NULL NULL 0 Using where
1 SIMPLE t3 ALL NULL NULL NULL NULL 0 Using where
1 SIMPLE t4 ALL NULL NULL NULL NULL 0 Using where
EXPLAIN SELECT /*+ BNL(t2, t3)*/ t1.a
FROM t1 LEFT JOIN (t2 LEFT JOIN (t3 LEFT JOIN t4 ON 1) ON t2.a) ON 0
WHERE t1.a OR t4.a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4
1 SIMPLE t2 ALL NULL NULL NULL NULL 0 Using where
1 SIMPLE t3 ALL NULL NULL NULL NULL 0 Using where
1 SIMPLE t4 ALL NULL NULL NULL NULL 0 Using where
EXPLAIN SELECT /*+ BNL(t2, t3, t4)*/ t1.a
FROM t1 LEFT JOIN (t2 LEFT JOIN (t3 LEFT JOIN t4 ON 1) ON t2.a) ON 0
WHERE t1.a OR t4.a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 4
1 SIMPLE t2 ALL NULL NULL NULL NULL 0 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t3 ALL NULL NULL NULL NULL 0 Using where; Using join buffer (incremental, BNL join)
1 SIMPLE t4 ALL NULL NULL NULL NULL 0 Using where; Using join buffer (incremental, BNL join)
DROP TABLE t1,t2,t3,t4;
#
# Mix of BNL/BKA flat and incremental join buffers for OUTER JOINs
#
set optimizer_switch='outer_join_with_cache=on,mrr=on,mrr_sort_keys=on,index_condition_pushdown=on';
CREATE TABLE t1 (a1 varchar(32)) ;
INSERT INTO t1 VALUES ('s'),('k');
CREATE TABLE t2 (a2 int PRIMARY KEY, b2 varchar(32)) ;
INSERT INTO t2 VALUES (7,'s');
CREATE TABLE t3 (a3 int PRIMARY KEY, b3 varchar(32)) ;
INSERT INTO t3 VALUES (7,'s');
CREATE TABLE t4 (a4 int);
INSERT INTO t4 VALUES (9);
CREATE TABLE t5(a5 int PRIMARY KEY, b5 int) ;
INSERT INTO t5 VALUES (7,0);
ANALYZE TABLES t1, t2, t3, t4, t5;
# Disable join buffering to enable it selectively on particular tables
SET SESSION join_cache_level = 0;
EXPLAIN
SELECT t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
1 SIMPLE t3 index PRIMARY PRIMARY 4 NULL 1 Using where; Using index
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t3.a3 1 Using where
1 SIMPLE t4 ALL NULL NULL NULL NULL 1 Using where
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using where
SELECT t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
a4 b5
9 0
9 NULL
EXPLAIN
SELECT /*+ BNL(t4) */ t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
1 SIMPLE t3 index PRIMARY PRIMARY 4 NULL 1 Using where; Using index
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t3.a3 1 Using where
1 SIMPLE t4 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using where
SELECT /*+ BNL(t4) */ t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
a4 b5
9 0
9 NULL
EXPLAIN
SELECT /*+ BNL(t4, t5) */ t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
1 SIMPLE t3 index PRIMARY PRIMARY 4 NULL 1 Using where; Using index
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t3.a3 1 Using where
1 SIMPLE t4 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t5 hash_ALL PRIMARY #hash#PRIMARY 4 test.t2.a2 1 Using where; Using join buffer (incremental, BNLH join)
SELECT /*+ BNL(t4, t5) */ t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
a4 b5
9 0
9 NULL
# Enable all join buffering capabilities:
SET SESSION join_cache_level = 8;
EXPLAIN
SELECT t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
1 SIMPLE t2 ALL PRIMARY NULL NULL NULL 1 Using where
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using index
1 SIMPLE t4 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using where; Using join buffer (incremental, BKAH join); Key-ordered Rowid-ordered scan
SELECT t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
a4 b5
9 0
9 NULL
EXPLAIN
SELECT /*+ NO_BNL(t4)*/ t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
1 SIMPLE t2 ALL PRIMARY NULL NULL NULL 1 Using where
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using index
1 SIMPLE t4 ALL NULL NULL NULL NULL 1 Using where
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
SELECT /*+ NO_BNL(t4)*/ t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
a4 b5
9 0
9 NULL
# Disable BKA so the BNLH join buffer will be employed:
EXPLAIN
SELECT /*+ NO_BKA(t5)*/ t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
1 SIMPLE t2 ALL PRIMARY NULL NULL NULL 1 Using where
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using index
1 SIMPLE t4 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t5 hash_ALL PRIMARY #hash#PRIMARY 4 test.t2.a2 1 Using where; Using join buffer (incremental, BNLH join)
SELECT /*+ NO_BKA(t5)*/ t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
a4 b5
9 0
9 NULL
EXPLAIN
SELECT /*+ NO_BKA(t5) NO_BNL(t5)*/ t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
1 SIMPLE t2 ALL PRIMARY NULL NULL NULL 1 Using where
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using index
1 SIMPLE t4 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t5 eq_ref PRIMARY PRIMARY 4 test.t2.a2 1 Using where
SELECT /*+ NO_BKA(t5) NO_BNL(t5)*/ t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
a4 b5
9 0
9 NULL
DROP TABLE t1,t2,t3,t4,t5;
# MRR & NO_MRR hint testing # MRR & NO_MRR hint testing
set optimizer_switch=default; set optimizer_switch=default;
set join_cache_level = 8;
CREATE TABLE t1 CREATE TABLE t1
( (
f1 int NOT NULL DEFAULT '0', f1 int NOT NULL DEFAULT '0',
...@@ -1554,4 +1896,8 @@ SELECT ...@@ -1554,4 +1896,8 @@ SELECT
Warnings: Warnings:
Warning 1064 Optimizer hint syntax error near '? bad syntax */ 1' at line 2 Warning 1064 Optimizer hint syntax error near '? bad syntax */ 1' at line 2
DROP TABLE t1; DROP TABLE t1;
set optimizer_switch=default; set optimizer_switch = DEFAULT;
set join_cache_level = DEFAULT;
#
# End of 11.7 tests
#
mysql-test/main/opt_hints.test
View file @ c8ce9fbb
...@@ -148,9 +148,9 @@ EXPLAIN EXTENDED SELECT * FROM ...@@ -148,9 +148,9 @@ EXPLAIN EXTENDED SELECT * FROM
WHERE t4.y = 8 AND t5.x BETWEEN 7 AND t4.y+0) AS TD; WHERE t4.y = 8 AND t5.x BETWEEN 7 AND t4.y+0) AS TD;
--echo # BKA & NO_BKA hint testing --echo # BKA & NO_BKA hint testing
set optimizer_switch=default; set optimizer_switch = DEFAULT;
set optimizer_switch='mrr=on,mrr_cost_based=off'; set optimizer_switch = 'mrr=on,mrr_cost_based=off';
set join_cache_level=6; set join_cache_level = 8;
CREATE TABLE t10(a INT); CREATE TABLE t10(a INT);
INSERT INTO t10 VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9); INSERT INTO t10 VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
...@@ -359,7 +359,9 @@ DEALLOCATE PREPARE stmt1; ...@@ -359,7 +359,9 @@ DEALLOCATE PREPARE stmt1;
DROP TABLE t1, t2, t3, t10, t11, t12, t13; DROP TABLE t1, t2, t3, t10, t11, t12, t13;
--echo # BNL & NO_BNL hint testing --echo #
--echo # BNL and NO_BNL hint testing
--echo #
set optimizer_switch=default; set optimizer_switch=default;
...@@ -387,16 +389,27 @@ EXPLAIN EXTENDED SELECT /*+ NO_BNL() */t1.* FROM t1,t2,t3; ...@@ -387,16 +389,27 @@ EXPLAIN EXTENDED SELECT /*+ NO_BNL() */t1.* FROM t1,t2,t3;
EXPLAIN EXTENDED SELECT /*+ NO_BNL(t2, t3) */t1.* FROM t1,t2,t3; EXPLAIN EXTENDED SELECT /*+ NO_BNL(t2, t3) */t1.* FROM t1,t2,t3;
EXPLAIN EXTENDED SELECT /*+ NO_BNL(t1, t3) */t1.* FROM t1,t2,t3; EXPLAIN EXTENDED SELECT /*+ NO_BNL(t1, t3) */t1.* FROM t1,t2,t3;
--echo # MariaDB does not have optimizer_switch='block_nested_loop=off' --echo # Make sure query results are the same for any hints combination
--echo # as MySQL does, so in fact we cannot disable BNL join. The cases below --sorted_result
--echo # test the BNL() hint, although it does not affect the execution plan SELECT * FROM t1,t2,t3;
--sorted_result
SELECT /*+ NO_BNL(t1, t2) */* FROM t1,t2,t3;
--sorted_result
SELECT /*+ NO_BNL(t1, t3) */* FROM t1,t2,t3;
--sorted_result
SELECT /*+ NO_BNL(t2, t3) */* FROM t1,t2,t3;
--echo # BNL() overrides current join_cache_level setting
set join_cache_level = 0;
EXPLAIN EXTENDED SELECT t1.* FROM t1,t2,t3; EXPLAIN EXTENDED SELECT t1.* FROM t1,t2,t3;
EXPLAIN EXTENDED SELECT /*+ BNL() */t1.* FROM t1,t2,t3; EXPLAIN EXTENDED SELECT /*+ BNL() */t1.* FROM t1,t2,t3;
EXPLAIN EXTENDED SELECT /*+ BNL(t2, t3) */t1.* FROM t1,t2,t3; EXPLAIN EXTENDED SELECT /*+ BNL(t1, t2) */t1.* FROM t1,t2,t3;
EXPLAIN EXTENDED SELECT /*+ BNL(t1, t3) */t1.* FROM t1,t2,t3; EXPLAIN EXTENDED SELECT /*+ BNL(t1, t3) */t1.* FROM t1,t2,t3;
EXPLAIN EXTENDED SELECT /*+ BNL(t2, t3) */t1.* FROM t1,t2,t3;
EXPLAIN EXTENDED SELECT /*+ BNL(t2) BNL(t3) */t1.* FROM t1,t2,t3; EXPLAIN EXTENDED SELECT /*+ BNL(t2) BNL(t3) */t1.* FROM t1,t2,t3;
DROP TABLE t1, t2, t3; DROP TABLE t1, t2, t3;
set join_cache_level = 8;
--echo # BNL in subquery --echo # BNL in subquery
set optimizer_switch = DEFAULT; set optimizer_switch = DEFAULT;
...@@ -408,34 +421,229 @@ INSERT INTO t2 VALUES (2), (3), (4), (5); ...@@ -408,34 +421,229 @@ INSERT INTO t2 VALUES (2), (3), (4), (5);
INSERT INTO t3 VALUES (10,3), (20,4), (30,5); INSERT INTO t3 VALUES (10,3), (20,4), (30,5);
ANALYZE TABLE t1, t2, t3; ANALYZE TABLE t1, t2, t3;
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) */ * FROM t1 JOIN t2 ON t1.b = t2.a WHERE EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) */ * FROM t1 JOIN t2 ON t1.a = t2.a WHERE
t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.b = t4.b); t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL() */ *
FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL(t1, t2) */ *
FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL(@subq1) */ *
FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL(t4@subq1) */ *
FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL(t3@subq1,t4@subq1) */ *
FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL(@subq1 t3, t4) */ *
FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) */ *
FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) NO_BNL(t3, t4) */ t3.b
FROM t3 JOIN t1 t4 ON t3.a = t4.b);
--echo # Make sure query results are the same for any hints combination
# --sorted_result
SELECT * FROM t1 JOIN t2 ON t1.a = t2.a WHERE
t2.a IN (SELECT t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
# --sorted_result
SELECT /*+ QB_NAME(q) */ * FROM t1 JOIN t2 ON t1.a = t2.a WHERE
t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
--sorted_result
SELECT /*+ QB_NAME(q) NO_BNL() */ *
FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
--sorted_result
SELECT /*+ QB_NAME(q) NO_BNL(t1, t2) */ *
FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
--sorted_result
SELECT /*+ QB_NAME(q) NO_BNL(@subq1) */ *
FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
--sorted_result
SELECT /*+ QB_NAME(q) NO_BNL(t4@subq1) */ *
FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
--sorted_result
SELECT /*+ QB_NAME(q) NO_BNL(t3@subq1,t4@subq1) */ *
FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
--sorted_result
SELECT /*+ QB_NAME(q) NO_BNL(@subq1 t3, t4) */ *
FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
--sorted_result
SELECT /*+ QB_NAME(q) */ *
FROM t1 JOIN t2 ON t1.a = t2.a
WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) NO_BNL(t3, t4) */ t3.b
FROM t3 JOIN t1 t4 ON t3.a = t4.b);
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL() */ * FROM t1 JOIN t2 ON t1.b = t2.a WHERE DROP TABLE t1, t2, t3, t4;
t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.b = t4.b);
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL(t1, t2) */ * FROM t1 JOIN t2 ON t1.b = t2.a WHERE --echo #
t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.b = t4.b); --echo # BNL() and NO_BNL() for LEFT JOINs
--echo #
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL(@subq1) */ * FROM t1 JOIN t2 ON t1.b = t2.a WHERE CREATE TABLE t1 (a int);
t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.b = t4.b); CREATE TABLE t2 (a int);
CREATE TABLE t3 (a int);
CREATE TABLE t4 (a int);
INSERT INTO t1 VALUES (null), (2), (null), (1);
set join_cache_level = 8;
--echo # Two join buffers are employed by default (without hints):
EXPLAIN SELECT t1.a
FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON t2.a) ON 0
WHERE t1.a OR t3.a;
--echo # Disabling either of join buffers disables another one automatically due
--echo # to join buffer employment rules:
EXPLAIN SELECT /*+ NO_BNL(t2) */ t1.a
FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON t2.a) ON 0
WHERE t1.a OR t3.a;
EXPLAIN SELECT /*+ NO_BNL(t3) */ t1.a
FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON t2.a) ON 0
WHERE t1.a OR t3.a;
--echo # Three join buffers are employed here by default (without hints):
EXPLAIN SELECT t1.a
FROM t1 LEFT JOIN (t2 LEFT JOIN (t3 LEFT JOIN t4 ON 1) ON t2.a) ON 0
WHERE t1.a OR t4.a;
--echo # Disabling either of join buffers disables others automatically due
--echo # to join buffer employment rules:
EXPLAIN SELECT /*+ NO_BNL(t2)*/ t1.a
FROM t1 LEFT JOIN (t2 LEFT JOIN (t3 LEFT JOIN t4 ON 1) ON t2.a) ON 0
WHERE t1.a OR t4.a;
EXPLAIN SELECT /*+ NO_BNL(t3)*/ t1.a
FROM t1 LEFT JOIN (t2 LEFT JOIN (t3 LEFT JOIN t4 ON 1) ON t2.a) ON 0
WHERE t1.a OR t4.a;
EXPLAIN SELECT /*+ NO_BNL(t4)*/ t1.a
FROM t1 LEFT JOIN (t2 LEFT JOIN (t3 LEFT JOIN t4 ON 1) ON t2.a) ON 0
WHERE t1.a OR t4.a;
set join_cache_level=0;
--echo # It is not allowed to enable join buffers on some subset of inner tables
--echo # of an outer join. Either all tables should use join buffers or none:
EXPLAIN SELECT /*+ BNL(t2)*/ t1.a
FROM t1 LEFT JOIN (t2 LEFT JOIN (t3 LEFT JOIN t4 ON 1) ON t2.a) ON 0
WHERE t1.a OR t4.a;
EXPLAIN SELECT /*+ BNL(t2, t3)*/ t1.a
FROM t1 LEFT JOIN (t2 LEFT JOIN (t3 LEFT JOIN t4 ON 1) ON t2.a) ON 0
WHERE t1.a OR t4.a;
EXPLAIN SELECT /*+ BNL(t2, t3, t4)*/ t1.a
FROM t1 LEFT JOIN (t2 LEFT JOIN (t3 LEFT JOIN t4 ON 1) ON t2.a) ON 0
WHERE t1.a OR t4.a;
DROP TABLE t1,t2,t3,t4;
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL(t4@subq1) */ * FROM t1 JOIN t2 ON t1.b = t2.a WHERE
t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.b = t4.b);
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL(t3@subq1,t4@subq1) */ * FROM t1 JOIN t2 ON t1.b = t2.a WHERE --echo #
t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.b = t4.b); --echo # Mix of BNL/BKA flat and incremental join buffers for OUTER JOINs
--echo #
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL(@subq1 t3, t4) */ * FROM t1 JOIN t2 ON t1.b = t2.a WHERE set optimizer_switch='outer_join_with_cache=on,mrr=on,mrr_sort_keys=on,index_condition_pushdown=on';
t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.b = t4.b);
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) */ * FROM t1 JOIN t2 ON t1.b = t2.a WHERE CREATE TABLE t1 (a1 varchar(32)) ;
t2.a IN (SELECT /*+ QB_NAME(subq1) NO_BNL(t3, t4) */ t3.b FROM t3 JOIN t1 t4 ON t3.b = t4.b); INSERT INTO t1 VALUES ('s'),('k');
CREATE TABLE t2 (a2 int PRIMARY KEY, b2 varchar(32)) ;
INSERT INTO t2 VALUES (7,'s');
CREATE TABLE t3 (a3 int PRIMARY KEY, b3 varchar(32)) ;
INSERT INTO t3 VALUES (7,'s');
CREATE TABLE t4 (a4 int);
INSERT INTO t4 VALUES (9);
CREATE TABLE t5(a5 int PRIMARY KEY, b5 int) ;
INSERT INTO t5 VALUES (7,0);
--disable_result_log
ANALYZE TABLES t1, t2, t3, t4, t5;
--enable_result_log
--echo # Disable join buffering to enable it selectively on particular tables
SET SESSION join_cache_level = 0;
EXPLAIN
SELECT t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
SELECT t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
EXPLAIN
SELECT /*+ BNL(t4) */ t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
SELECT /*+ BNL(t4) */ t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
EXPLAIN
SELECT /*+ BNL(t4, t5) */ t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
SELECT /*+ BNL(t4, t5) */ t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
--echo # Enable all join buffering capabilities:
SET SESSION join_cache_level = 8;
EXPLAIN
SELECT t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
SELECT t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
EXPLAIN
SELECT /*+ NO_BNL(t4)*/ t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
SELECT /*+ NO_BNL(t4)*/ t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
--echo # Disable BKA so the BNLH join buffer will be employed:
EXPLAIN
SELECT /*+ NO_BKA(t5)*/ t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
SELECT /*+ NO_BKA(t5)*/ t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
EXPLAIN
SELECT /*+ NO_BKA(t5) NO_BNL(t5)*/ t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
SELECT /*+ NO_BKA(t5) NO_BNL(t5)*/ t4.a4, t5.b5
FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
DROP TABLE t1,t2,t3,t4,t5;
DROP TABLE t1, t2, t3, t4;
--echo # MRR & NO_MRR hint testing --echo # MRR & NO_MRR hint testing
set optimizer_switch=default; set optimizer_switch=default;
set join_cache_level = 8;
CREATE TABLE t1 CREATE TABLE t1
( (
...@@ -750,4 +958,8 @@ SELECT ...@@ -750,4 +958,8 @@ SELECT
/*+ ? bad syntax */ 1; /*+ ? bad syntax */ 1;
DROP TABLE t1; DROP TABLE t1;
set optimizer_switch=default; set optimizer_switch = DEFAULT;
set join_cache_level = DEFAULT;
--echo #
--echo # End of 11.7 tests
--echo #
sql/sql_select.cc
View file @ c8ce9fbb
...@@ -15004,11 +15004,13 @@ end_sj_materialize(JOIN *join, JOIN_TAB *join_tab, bool end_of_records) ...@@ -15004,11 +15004,13 @@ end_sj_materialize(JOIN *join, JOIN_TAB *join_tab, bool end_of_records)
join_cache_hashed, join_cache_bka, join_cache_hashed, join_cache_bka,
are set on or off are set on or off
- the join cache level set for the query - the join cache level set for the query
- the join 'options'. - the join 'options'
- combination of optimizer hints (see section "Optimizer hints" below).
In any case join buffer is not used if the number of the joined table is In any case join buffer is not used if the number of the joined table is
greater than 'no_jbuf_after'. It's also never used if the value of greater than 'no_jbuf_after'. It's also not used if the value of
join_cache_level is equal to 0. join_cache_level is equal to 0 and BNL() hint is not specified for
the table (see section below).
If the optimizer switch outer_join_with_cache is off no join buffer is If the optimizer switch outer_join_with_cache is off no join buffer is
used for outer join operations. used for outer join operations.
If the optimizer switch semijoin_with_cache is off no join buffer is used If the optimizer switch semijoin_with_cache is off no join buffer is used
...@@ -15018,10 +15020,12 @@ end_sj_materialize(JOIN *join, JOIN_TAB *join_tab, bool end_of_records) ...@@ -15018,10 +15020,12 @@ end_sj_materialize(JOIN *join, JOIN_TAB *join_tab, bool end_of_records)
If the optimizer switch join_cache_hashed is off then the optimizer uses If the optimizer switch join_cache_hashed is off then the optimizer uses
neither BNLH algorithm, nor BKAH algorithm to perform join operations. neither BNLH algorithm, nor BKAH algorithm to perform join operations.
If the optimizer switch join_cache_bka is off then the optimizer uses If the optimizer switch join_cache_bka is off and BKA() hint is
neither BKA algorithm, nor BKAH algorithm to perform join operation. not specified then, the optimizer uses neither BKA algorithm,
nor BKAH algorithm to perform join operation.
The valid settings for join_cache_level lay in the interval 0..8. The valid settings for join_cache_level lay in the interval 0..8.
If it set to 0 no join buffers are used to perform join operations. If it set to 0 and BNL() hint is not specified, no join buffers are used
to perform join operations.
Currently we differentiate between join caches of 8 levels: Currently we differentiate between join caches of 8 levels:
1 : non-incremental join cache used for BNL join algorithm 1 : non-incremental join cache used for BNL join algorithm
2 : incremental join cache used for BNL join algorithm 2 : incremental join cache used for BNL join algorithm
...@@ -15039,14 +15043,18 @@ end_sj_materialize(JOIN *join, JOIN_TAB *join_tab, bool end_of_records) ...@@ -15039,14 +15043,18 @@ end_sj_materialize(JOIN *join, JOIN_TAB *join_tab, bool end_of_records)
the following rules are applied. the following rules are applied.
If join_cache_level==1|2 then join buffer is used for inner joins, outer If join_cache_level==1|2 then join buffer is used for inner joins, outer
joins and semi-joins with 'JT_ALL' access method. In this case a joins and semi-joins with 'JT_ALL' access method. In this case a
JOIN_CACHE_BNL object is employed. JOIN_CACHE_BNL object is employed (unless NO_BNL() hint is specified
for the table).
If join_cache_level==3|4 and then join buffer is used for a join operation If join_cache_level==3|4 and then join buffer is used for a join operation
(inner join, outer join, semi-join) with 'JT_REF'/'JT_EQREF' access method (inner join, outer join, semi-join) with 'JT_REF'/'JT_EQREF' access method
then a JOIN_CACHE_BNLH object is employed. then a JOIN_CACHE_BNLH object is employed (unless NO_BNL() hint
is specified).
If an index is used to access rows of the joined table and the value of If an index is used to access rows of the joined table and the value of
join_cache_level==5|6 then a JOIN_CACHE_BKA object is employed. join_cache_level==5|6 then a JOIN_CACHE_BKA object is employed (unless
NO_BKA() hint is specified).
If an index is used to access rows of the joined table and the value of If an index is used to access rows of the joined table and the value of
join_cache_level==7|8 then a JOIN_CACHE_BKAH object is employed. join_cache_level==7|8 then a JOIN_CACHE_BKAH object is employed (unless
NO_BKA() hint is specified).
If the value of join_cache_level is odd then creation of a non-linked If the value of join_cache_level is odd then creation of a non-linked
join cache is forced. join cache is forced.
...@@ -15074,6 +15082,30 @@ end_sj_materialize(JOIN *join, JOIN_TAB *join_tab, bool end_of_records) ...@@ -15074,6 +15082,30 @@ end_sj_materialize(JOIN *join, JOIN_TAB *join_tab, bool end_of_records)
The functions changes the value the fields tab->icp_other_tables_ok and The functions changes the value the fields tab->icp_other_tables_ok and
tab->idx_cond_fact_out to FALSE if the chosen join cache algorithm tab->idx_cond_fact_out to FALSE if the chosen join cache algorithm
requires it. requires it.
OPTIMIZER_HINTS
The following hints may influence the choice of join buffering:
BNL(t1,t2,..): enables BNL and BNLH buffers for the specified tables
when join_cache_level=0. Effectively it increases
join_cache_level to 4 for given tables.
NO_BNL(t1,t2,..): disables BNL/BNLH join buffers, which could have been
chosen for the specified tables otherwise. Does not
prevent employing of BKA/BKAH buffers
BKA(t1,t2,..): enables BKA and BKAH buffers for the specified tables
when optimizer switch join_cache_bka=off. Does not
increase join_cache_level, i.e., when join_cache_level=4
and the hint is specified, BKA join buffers will still
not be employed. The hint effectively overrides only
optimizer switch join_cache_bka setting.
NO_BKA(t1,t2,..): disables BKA/BKAH join buffers, which could have been
chosen for the specified tables otherwise. However,
does not prevent employing of BNL/BNLH buffers.
Optimizer hints do not break the rules of join buffer application, such as
a chain of linked buffers or applying buffers to an outer join tables like
in the case described in Notes below.
If a hint cannot be applied it is either ignored or other tables' join
buffering choices are revised to ensure the consistency of buffers chains.
NOTES NOTES
An inner table of a nested outer join or a nested semi-join can be currently An inner table of a nested outer join or a nested semi-join can be currently
...@@ -15143,12 +15175,19 @@ uint check_join_cache_usage(JOIN_TAB *tab, ...@@ -15143,12 +15175,19 @@ uint check_join_cache_usage(JOIN_TAB *tab,
if (tab->no_forced_join_cache || (no_bnl_cache && no_bka_cache)) if (tab->no_forced_join_cache || (no_bnl_cache && no_bka_cache))
goto no_join_cache; goto no_join_cache;
if (cache_level == 0 && hint_table_state_or_fallback(join->thd,
tab->tab_list->table,
BNL_HINT_ENUM, false))
{
cache_level= 4; // BNL() hint present, raise join_cache_level to BNLH
}
/* /*
Don't use join cache if @@join_cache_level==0 or this table is the first Don't use join cache if @@join_cache_level==0 or this table is the first
one join suborder (either at top level or inside a bush) one join suborder (either at top level or inside a bush)
*/ */
if (cache_level == 0 || !prev_tab) if (cache_level == 0 || !prev_tab)
return 0; goto no_join_cache;
if (force_unlinked_cache && (cache_level%2 == 0)) if (force_unlinked_cache && (cache_level%2 == 0))
cache_level--; cache_level--;
...@@ -15227,6 +15266,12 @@ uint check_join_cache_usage(JOIN_TAB *tab, ...@@ -15227,6 +15266,12 @@ uint check_join_cache_usage(JOIN_TAB *tab,
if (tab->loosescan_match_tab || tab->bush_children) if (tab->loosescan_match_tab || tab->bush_children)
goto no_join_cache; goto no_join_cache;
/*
An inner table of an outer join nest must not use join buffering if
the first inner table of that outer join nest does not use join buffering
or if the tables in the embedding outer join nest do not use join buffering.
Also see revise_cache_usage()
*/
for (JOIN_TAB *first_inner= tab->first_inner; first_inner; for (JOIN_TAB *first_inner= tab->first_inner; first_inner;
first_inner= first_inner->first_upper) first_inner= first_inner->first_upper)
{ {
...@@ -15302,6 +15347,8 @@ uint check_join_cache_usage(JOIN_TAB *tab, ...@@ -15302,6 +15347,8 @@ uint check_join_cache_usage(JOIN_TAB *tab,
tab->is_ref_for_hash_join() || tab->is_ref_for_hash_join() ||
((flags & HA_MRR_NO_ASSOCIATION) && cache_level <=6)) ((flags & HA_MRR_NO_ASSOCIATION) && cache_level <=6))
{ {
if (no_bnl_cache)
goto no_join_cache;
if (!tab->hash_join_is_possible() || if (!tab->hash_join_is_possible() ||
tab->make_scan_filter()) tab->make_scan_filter())
goto no_join_cache; goto no_join_cache;
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