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Commit 6edc0225 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.
parent dd8934bd
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Showing with 452 additions and 100 deletions
mysql-test/main/opt_hints.result
View file @ 6edc0225
...@@ -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 +879,240 @@ test.t2 analyze status Engine-independent statistics collected ...@@ -829,81 +879,240 @@ 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;
# 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 +1763,8 @@ SELECT ...@@ -1554,4 +1763,8 @@ 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 @ 6edc0225
...@@ -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 +421,141 @@ INSERT INTO t2 VALUES (2), (3), (4), (5); ...@@ -408,34 +421,141 @@ 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.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);
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL(t1, t2) */ * 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(t1, t2) */ *
FROM t1 JOIN t2 ON t1.a = t2.a
EXPLAIN EXTENDED SELECT /*+ QB_NAME(q) NO_BNL(@subq1) */ * FROM t1 JOIN t2 ON t1.b = t2.a WHERE WHERE t2.a IN (SELECT /*+ QB_NAME(subq1) */ t3.b FROM t3 JOIN t1 t4 ON t3.a = t4.b);
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(@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(t4@subq1) */ * 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(t3@subq1,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(@subq1 t3, t4) */ * 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) */ * FROM t1 JOIN t2 ON t1.b = t2.a WHERE CREATE TABLE t1 (a int);
t2.a IN (SELECT /*+ QB_NAME(subq1) NO_BNL(t3, t4) */ 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;
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 +870,8 @@ SELECT ...@@ -750,4 +870,8 @@ 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 @ 6edc0225
...@@ -15143,12 +15143,19 @@ uint check_join_cache_usage(JOIN_TAB *tab, ...@@ -15143,12 +15143,19 @@ 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 +15234,12 @@ uint check_join_cache_usage(JOIN_TAB *tab, ...@@ -15227,6 +15234,12 @@ 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 +15315,8 @@ uint check_join_cache_usage(JOIN_TAB *tab, ...@@ -15302,6 +15315,8 @@ 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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