mirror of
https://github.com/MariaDB/server.git
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MWL#128: Added into EXPLAIN output info about types of the used join buffers and
about the employed join algorithms. Refactored constructors of the JOIN_CACHE* classes.
This commit is contained in:
Igor Babaev
parent
79087c9e07
commit
25f5debdc7
65 changed files with 1072 additions and 995 deletions
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@ -80,8 +80,8 @@ ON t2.b=t4.b
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WHERE t3.a=1 OR t3.c IS NULL;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00
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1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
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1 SIMPLE t4 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
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1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (flat, BNL join)
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1 SIMPLE t4 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
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Warnings:
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Note 1003 select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b` from `test`.`t2` left join (`test`.`t3` join `test`.`t4`) on((`test`.`t4`.`b` = `test`.`t2`.`b`)) where ((`test`.`t3`.`a` = 1) or isnull(`test`.`t3`.`c`))
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SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
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@ -156,9 +156,9 @@ ON t2.b=t4.b
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WHERE t3.a>1 OR t3.c IS NULL;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00
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1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
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1 SIMPLE t4 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
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1 SIMPLE t5 ALL NULL NULL NULL NULL 3 100.00 Using join buffer
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1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (flat, BNL join)
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1 SIMPLE t4 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
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1 SIMPLE t5 ALL NULL NULL NULL NULL 3 100.00 Using join buffer (incremental, BNL join)
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Warnings:
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Note 1003 select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b` from `test`.`t2` left join (`test`.`t3` join `test`.`t4` join `test`.`t5`) on((`test`.`t4`.`b` = `test`.`t2`.`b`)) where ((`test`.`t3`.`a` > 1) or isnull(`test`.`t3`.`c`))
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SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,t5.a,t5.b
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@ -186,9 +186,9 @@ WHERE (t3.a>1 OR t3.c IS NULL) AND
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(t5.a<3 OR t5.c IS NULL);
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00
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1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
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1 SIMPLE t4 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
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1 SIMPLE t5 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
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1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (flat, BNL join)
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1 SIMPLE t4 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
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1 SIMPLE t5 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join)
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Warnings:
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Note 1003 select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b` from `test`.`t2` left join (`test`.`t3` join `test`.`t4` join `test`.`t5`) on((`test`.`t4`.`b` = `test`.`t2`.`b`)) where (((`test`.`t3`.`a` > 1) or isnull(`test`.`t3`.`c`)) and ((`test`.`t5`.`a` < 3) or isnull(`test`.`t5`.`c`)))
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SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,t5.a,t5.b
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@ -236,8 +236,8 @@ t8
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ON t7.b=t8.b AND t6.b < 10;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t7 ALL NULL NULL NULL NULL 2 100.00
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1 SIMPLE t6 ALL NULL NULL NULL NULL 3 100.00 Using join buffer
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1 SIMPLE t8 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
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1 SIMPLE t6 ALL NULL NULL NULL NULL 3 100.00 Using join buffer (flat, BNL join)
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1 SIMPLE t8 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
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Warnings:
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Note 1003 select `test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b` from `test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t7`.`b` = `test`.`t8`.`b`) and (`test`.`t6`.`b` < 10))) where 1
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SELECT t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
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@ -551,14 +551,14 @@ t0.b=t1.b AND
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(t2.a >= 4 OR t2.c IS NULL);
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t0 ALL NULL NULL NULL NULL 3 100.00 Using where
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
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1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
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1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
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1 SIMPLE t4 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
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1 SIMPLE t5 ALL NULL NULL NULL NULL 3 100.00 Using join buffer
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1 SIMPLE t7 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
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1 SIMPLE t6 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
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1 SIMPLE t8 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (flat, BNL join)
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1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join)
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1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
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1 SIMPLE t4 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
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1 SIMPLE t5 ALL NULL NULL NULL NULL 3 100.00 Using join buffer (incremental, BNL join)
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1 SIMPLE t7 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
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1 SIMPLE t6 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join)
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1 SIMPLE t8 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
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Warnings:
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Note 1003 select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on(((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t8`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` < 10)))) on(((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` >= 2)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and ((`test`.`t5`.`b` = `test`.`t0`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) where ((`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)))
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SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
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@ -646,15 +646,15 @@ t0.b=t1.b AND
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(t9.a=1);
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t0 ALL NULL NULL NULL NULL 3 100.00 Using where
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
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1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
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1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
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1 SIMPLE t4 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
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1 SIMPLE t5 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
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1 SIMPLE t7 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
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1 SIMPLE t6 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
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1 SIMPLE t8 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
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1 SIMPLE t9 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (flat, BNL join)
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1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join)
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1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
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1 SIMPLE t4 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
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1 SIMPLE t5 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join)
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1 SIMPLE t7 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
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1 SIMPLE t6 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join)
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1 SIMPLE t8 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
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1 SIMPLE t9 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join)
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Warnings:
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Note 1003 select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b`,`test`.`t9`.`a` AS `a`,`test`.`t9`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on(((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t8`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` < 10)))) on(((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` >= 2)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and ((`test`.`t5`.`b` = `test`.`t0`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) join `test`.`t9` where ((`test`.`t9`.`a` = 1) and (`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)) and ((`test`.`t3`.`a` < 5) or isnull(`test`.`t3`.`c`)) and ((`test`.`t4`.`b` = `test`.`t3`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t4`.`c`)) and ((`test`.`t5`.`a` >= 2) or isnull(`test`.`t5`.`c`)) and ((`test`.`t6`.`a` >= 4) or isnull(`test`.`t6`.`c`)) and ((`test`.`t7`.`a` <= 2) or isnull(`test`.`t7`.`c`)) and ((`test`.`t8`.`a` < 1) or isnull(`test`.`t8`.`c`)) and ((`test`.`t9`.`b` = `test`.`t8`.`b`) or isnull(`test`.`t8`.`c`)))
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SELECT t9.a,t9.b
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@ -843,9 +843,9 @@ ON t3.a=1 AND t2.b=t4.b
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WHERE t1.a <= 2;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where
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1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00 Using join buffer
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1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
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1 SIMPLE t4 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
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1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00 Using join buffer (flat, BNL join)
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1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
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1 SIMPLE t4 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
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Warnings:
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Note 1003 select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b` from `test`.`t1` join `test`.`t2` left join (`test`.`t3` join `test`.`t4`) on(((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1))) where (`test`.`t1`.`a` <= 2)
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CREATE INDEX idx_b ON t2(b);
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@ -857,9 +857,9 @@ LEFT JOIN
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ON t3.a=1 AND t3.b=t2.b AND t2.b=t4.b;
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00
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1 SIMPLE t4 ALL NULL NULL NULL NULL 2 100.00 Using join buffer
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1 SIMPLE t2 ref idx_b idx_b 5 test.t3.b 2 100.00 Using where; Using join buffer
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using join buffer
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1 SIMPLE t4 ALL NULL NULL NULL NULL 2 100.00 Using join buffer (flat, BNL join)
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1 SIMPLE t2 ref idx_b idx_b 5 test.t3.b 2 100.00 Using where; Using join buffer (incremental, BKA join)
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using join buffer (incremental, BNL join)
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Warnings:
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Note 1003 select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b` from `test`.`t3` join `test`.`t4` left join (`test`.`t1` join `test`.`t2`) on((((`test`.`t3`.`a` = 1) and (`test`.`t3`.`b` = `test`.`t2`.`b`) and (`test`.`t2`.`b` = `test`.`t4`.`b`)) and (`test`.`t3`.`b` is not null))) where 1
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SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
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@ -913,15 +913,15 @@ t0.b=t1.b AND
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(t9.a=1);
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t0 ALL NULL NULL NULL NULL 3 100.00 Using where
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
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1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
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1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
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1 SIMPLE t4 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
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1 SIMPLE t5 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
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1 SIMPLE t7 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
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1 SIMPLE t6 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
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1 SIMPLE t8 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
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1 SIMPLE t9 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (flat, BNL join)
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1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join)
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1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
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1 SIMPLE t4 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
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1 SIMPLE t5 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join)
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1 SIMPLE t7 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
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1 SIMPLE t6 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join)
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1 SIMPLE t8 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
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1 SIMPLE t9 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join)
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Warnings:
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Note 1003 select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b`,`test`.`t9`.`a` AS `a`,`test`.`t9`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on(((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t8`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` < 10)))) on(((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` >= 2)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and ((`test`.`t5`.`b` = `test`.`t0`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) join `test`.`t9` where ((`test`.`t9`.`a` = 1) and (`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)) and ((`test`.`t3`.`a` < 5) or isnull(`test`.`t3`.`c`)) and ((`test`.`t4`.`b` = `test`.`t3`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t4`.`c`)) and ((`test`.`t5`.`a` >= 2) or isnull(`test`.`t5`.`c`)) and ((`test`.`t6`.`a` >= 4) or isnull(`test`.`t6`.`c`)) and ((`test`.`t7`.`a` <= 2) or isnull(`test`.`t7`.`c`)) and ((`test`.`t8`.`a` < 1) or isnull(`test`.`t8`.`c`)) and ((`test`.`t9`.`b` = `test`.`t8`.`b`) or isnull(`test`.`t8`.`c`)))
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CREATE INDEX idx_b ON t4(b);
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@ -963,15 +963,15 @@ t0.b=t1.b AND
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(t9.a=1);
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t0 ALL NULL NULL NULL NULL 3 100.00 Using where
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1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
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1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
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1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
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1 SIMPLE t4 ref idx_b idx_b 5 test.t2.b 2 100.00 Using where; Using join buffer
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1 SIMPLE t5 ALL idx_b NULL NULL NULL 3 100.00 Using where; Using join buffer
|
||||
1 SIMPLE t7 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
|
||||
1 SIMPLE t8 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
|
||||
1 SIMPLE t9 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (flat, BNL join)
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join)
|
||||
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
|
||||
1 SIMPLE t4 ref idx_b idx_b 5 test.t2.b 2 100.00 Using where; Using join buffer (incremental, BKA join)
|
||||
1 SIMPLE t5 ALL idx_b NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join)
|
||||
1 SIMPLE t7 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join)
|
||||
1 SIMPLE t8 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
|
||||
1 SIMPLE t9 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join)
|
||||
Warnings:
|
||||
Note 1003 select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b`,`test`.`t9`.`a` AS `a`,`test`.`t9`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on((((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1)) and (`test`.`t2`.`b` is not null))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t8`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` < 10)))) on(((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` >= 2)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and ((`test`.`t5`.`b` = `test`.`t0`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) join `test`.`t9` where ((`test`.`t9`.`a` = 1) and (`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)) and ((`test`.`t3`.`a` < 5) or isnull(`test`.`t3`.`c`)) and ((`test`.`t4`.`b` = `test`.`t3`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t4`.`c`)) and ((`test`.`t5`.`a` >= 2) or isnull(`test`.`t5`.`c`)) and ((`test`.`t6`.`a` >= 4) or isnull(`test`.`t6`.`c`)) and ((`test`.`t7`.`a` <= 2) or isnull(`test`.`t7`.`c`)) and ((`test`.`t8`.`a` < 1) or isnull(`test`.`t8`.`c`)) and ((`test`.`t9`.`b` = `test`.`t8`.`b`) or isnull(`test`.`t8`.`c`)))
|
||||
CREATE INDEX idx_b ON t8(b);
|
||||
|
|
@ -1012,15 +1012,15 @@ t0.b=t1.b AND
|
|||
(t9.a=1);
|
||||
id select_type table type possible_keys key key_len ref rows filtered Extra
|
||||
1 SIMPLE t0 ALL NULL NULL NULL NULL 3 100.00 Using where
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
|
||||
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
|
||||
1 SIMPLE t4 ref idx_b idx_b 5 test.t2.b 2 100.00 Using where; Using join buffer
|
||||
1 SIMPLE t5 ALL idx_b NULL NULL NULL 3 100.00 Using where; Using join buffer
|
||||
1 SIMPLE t7 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
|
||||
1 SIMPLE t8 ref idx_b idx_b 5 test.t5.b 2 100.00 Using where; Using join buffer
|
||||
1 SIMPLE t9 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (flat, BNL join)
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join)
|
||||
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
|
||||
1 SIMPLE t4 ref idx_b idx_b 5 test.t2.b 2 100.00 Using where; Using join buffer (incremental, BKA join)
|
||||
1 SIMPLE t5 ALL idx_b NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join)
|
||||
1 SIMPLE t7 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join)
|
||||
1 SIMPLE t8 ref idx_b idx_b 5 test.t5.b 2 100.00 Using where; Using join buffer (incremental, BKA join)
|
||||
1 SIMPLE t9 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join)
|
||||
Warnings:
|
||||
Note 1003 select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b`,`test`.`t9`.`a` AS `a`,`test`.`t9`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on((((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1)) and (`test`.`t2`.`b` is not null))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on((((`test`.`t8`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` < 10)) and (`test`.`t5`.`b` is not null)))) on(((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` >= 2)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and ((`test`.`t5`.`b` = `test`.`t0`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) join `test`.`t9` where ((`test`.`t9`.`a` = 1) and (`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)) and ((`test`.`t3`.`a` < 5) or isnull(`test`.`t3`.`c`)) and ((`test`.`t4`.`b` = `test`.`t3`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t4`.`c`)) and ((`test`.`t5`.`a` >= 2) or isnull(`test`.`t5`.`c`)) and ((`test`.`t6`.`a` >= 4) or isnull(`test`.`t6`.`c`)) and ((`test`.`t7`.`a` <= 2) or isnull(`test`.`t7`.`c`)) and ((`test`.`t8`.`a` < 1) or isnull(`test`.`t8`.`c`)) and ((`test`.`t9`.`b` = `test`.`t8`.`b`) or isnull(`test`.`t8`.`c`)))
|
||||
CREATE INDEX idx_b ON t1(b);
|
||||
|
|
@ -1062,15 +1062,15 @@ t0.b=t1.b AND
|
|||
(t9.a=1);
|
||||
id select_type table type possible_keys key key_len ref rows filtered Extra
|
||||
1 SIMPLE t0 ref idx_a idx_a 5 const 1 100.00 Using where
|
||||
1 SIMPLE t1 ref idx_b idx_b 5 test.t0.b 2 100.00 Using join buffer
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
|
||||
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
|
||||
1 SIMPLE t4 ref idx_b idx_b 5 test.t2.b 2 100.00 Using where; Using join buffer
|
||||
1 SIMPLE t5 ALL idx_b NULL NULL NULL 3 100.00 Using where; Using join buffer
|
||||
1 SIMPLE t7 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
|
||||
1 SIMPLE t8 ref idx_b idx_b 5 test.t5.b 2 100.00 Using where; Using join buffer
|
||||
1 SIMPLE t9 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer
|
||||
1 SIMPLE t1 ref idx_b idx_b 5 test.t0.b 2 100.00 Using join buffer (flat, BKA join)
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join)
|
||||
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
|
||||
1 SIMPLE t4 ref idx_b idx_b 5 test.t2.b 2 100.00 Using where; Using join buffer (incremental, BKA join)
|
||||
1 SIMPLE t5 ALL idx_b NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join)
|
||||
1 SIMPLE t7 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join)
|
||||
1 SIMPLE t8 ref idx_b idx_b 5 test.t5.b 2 100.00 Using where; Using join buffer (incremental, BKA join)
|
||||
1 SIMPLE t9 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join)
|
||||
Warnings:
|
||||
Note 1003 select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b`,`test`.`t9`.`a` AS `a`,`test`.`t9`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on((((`test`.`t4`.`b` = `test`.`t2`.`b`) and (`test`.`t3`.`a` = 1)) and (`test`.`t2`.`b` is not null))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on((((`test`.`t8`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` < 10)) and (`test`.`t5`.`b` is not null)))) on(((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t6`.`b` >= 2)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and ((`test`.`t5`.`b` = `test`.`t0`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) join `test`.`t9` where ((`test`.`t9`.`a` = 1) and (`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)) and ((`test`.`t3`.`a` < 5) or isnull(`test`.`t3`.`c`)) and ((`test`.`t4`.`b` = `test`.`t3`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t4`.`c`)) and ((`test`.`t5`.`a` >= 2) or isnull(`test`.`t5`.`c`)) and ((`test`.`t6`.`a` >= 4) or isnull(`test`.`t6`.`c`)) and ((`test`.`t7`.`a` <= 2) or isnull(`test`.`t7`.`c`)) and ((`test`.`t8`.`a` < 1) or isnull(`test`.`t8`.`c`)) and ((`test`.`t9`.`b` = `test`.`t8`.`b`) or isnull(`test`.`t8`.`c`)))
|
||||
SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
|
||||
|
|
@ -1324,8 +1324,8 @@ c11 c21 c31
|
|||
EXPLAIN SELECT * FROM t1 LEFT JOIN (t2 LEFT JOIN t3 ON c21=c31) ON c11=c21;
|
||||
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 NULL NULL NULL NULL 0 Using where; Using join buffer
|
||||
1 SIMPLE t3 ALL NULL NULL NULL NULL 0 Using where; Using join buffer
|
||||
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)
|
||||
DROP TABLE t1,t2,t3;
|
||||
CREATE TABLE t1 (goods int(12) NOT NULL, price varchar(128) NOT NULL);
|
||||
INSERT INTO t1 VALUES (23, 2340), (26, 9900);
|
||||
|
|
@ -1452,27 +1452,27 @@ explain select * from t4 join
|
|||
t2 left join (t3 join t5 on t5.a=t3.b) on t3.a=t2.b where t4.a<=>t3.b;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL X
|
||||
1 SIMPLE t3 ref a a 5 test.t2.b X Using where; Using join buffer
|
||||
1 SIMPLE t5 ref a a 5 test.t3.b X Using join buffer
|
||||
1 SIMPLE t4 ref a a 5 test.t3.b X Using index condition(BKA); Using join buffer
|
||||
1 SIMPLE t3 ref a a 5 test.t2.b X Using where; Using join buffer (flat, BKA join)
|
||||
1 SIMPLE t5 ref a a 5 test.t3.b X Using join buffer (incremental, BKA join)
|
||||
1 SIMPLE t4 ref a a 5 test.t3.b X Using index condition(BKA); Using join buffer (incremental, BKA join)
|
||||
explain select * from (t4 join t6 on t6.a=t4.b) right join t3 on t4.a=t3.b
|
||||
join t2 left join (t5 join t7 on t7.a=t5.b) on t5.a=t2.b where t3.a<=>t2.b;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL X
|
||||
1 SIMPLE t3 ref a a 5 test.t2.b X Using index condition(BKA); Using join buffer
|
||||
1 SIMPLE t4 ref a a 5 test.t3.b X Using where; Using join buffer
|
||||
1 SIMPLE t6 ref a a 5 test.t4.b X Using join buffer
|
||||
1 SIMPLE t5 ref a a 5 test.t2.b X Using where; Using join buffer
|
||||
1 SIMPLE t7 ref a a 5 test.t5.b X Using join buffer
|
||||
1 SIMPLE t3 ref a a 5 test.t2.b X Using index condition(BKA); Using join buffer (flat, BKA join)
|
||||
1 SIMPLE t4 ref a a 5 test.t3.b X Using where; Using join buffer (incremental, BKA join)
|
||||
1 SIMPLE t6 ref a a 5 test.t4.b X Using join buffer (incremental, BKA join)
|
||||
1 SIMPLE t5 ref a a 5 test.t2.b X Using where; Using join buffer (incremental, BKA join)
|
||||
1 SIMPLE t7 ref a a 5 test.t5.b X Using join buffer (incremental, BKA join)
|
||||
explain select * from t2 left join
|
||||
(t3 left join (t4 join t6 on t6.a=t4.b) on t4.a=t3.b
|
||||
join t5 on t5.a=t3.b) on t3.a=t2.b;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t2 ALL NULL NULL NULL NULL X
|
||||
1 SIMPLE t3 ref a a 5 test.t2.b X Using where; Using join buffer
|
||||
1 SIMPLE t4 ref a a 5 test.t3.b X Using where; Using join buffer
|
||||
1 SIMPLE t6 ref a a 5 test.t4.b X Using join buffer
|
||||
1 SIMPLE t5 ref a a 5 test.t3.b X Using join buffer
|
||||
1 SIMPLE t3 ref a a 5 test.t2.b X Using where; Using join buffer (flat, BKA join)
|
||||
1 SIMPLE t4 ref a a 5 test.t3.b X Using where; Using join buffer (incremental, BKA join)
|
||||
1 SIMPLE t6 ref a a 5 test.t4.b X Using join buffer (incremental, BKA join)
|
||||
1 SIMPLE t5 ref a a 5 test.t3.b X Using join buffer (incremental, BKA join)
|
||||
drop table t0, t1, t2, t3, t4, t5, t6, t7;
|
||||
create table t1 (a int);
|
||||
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
|
||||
|
|
@ -1485,8 +1485,8 @@ explain select * from t1 left join
|
|||
on (t1.a = t2.a);
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 10
|
||||
1 SIMPLE t2 ref a a 5 test.t1.a 1 Using where; Using join buffer
|
||||
1 SIMPLE t3 ref a a 5 test.t2.a 1 Using where; Using join buffer
|
||||
1 SIMPLE t2 ref a a 5 test.t1.a 1 Using where; Using join buffer (flat, BKA join)
|
||||
1 SIMPLE t3 ref a a 5 test.t2.a 1 Using where; Using join buffer (incremental, BKA join)
|
||||
drop table t1, t2, t3;
|
||||
CREATE TABLE t1 (id int NOT NULL PRIMARY KEY, type varchar(10));
|
||||
CREATE TABLE t2 (pid int NOT NULL PRIMARY KEY, type varchar(10));
|
||||
|
|
@ -1737,7 +1737,7 @@ LEFT JOIN
|
|||
ON t4.carrier = t1.carrier;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t2 index package_id package_id 5 NULL 45 Using where; Using index
|
||||
1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.package_id 1 Using join buffer
|
||||
1 SIMPLE t1 eq_ref PRIMARY PRIMARY 4 test.t2.package_id 1 Using join buffer (flat, BKA join)
|
||||
1 SIMPLE t4 eq_ref PRIMARY,id PRIMARY 2 test.t1.carrier 1 Using where
|
||||
1 SIMPLE t5 ref carrier_id carrier_id 5 test.t4.id 22 Using index
|
||||
1 SIMPLE t3 ref package_id package_id 5 test.t1.id 1 Using where; Using index
|
||||
|
|
@ -1773,9 +1773,9 @@ ON t6.b >= 2 AND t5.b=t7.b AND
|
|||
(t8.a > 0 OR t8.c IS NULL);
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t5 ALL NULL NULL NULL NULL 3
|
||||
1 SIMPLE t7 ref b_i b_i 5 test.t5.b 2 Using where; Using join buffer
|
||||
1 SIMPLE t6 ALL b_i NULL NULL NULL 3 Using where; Using join buffer
|
||||
1 SIMPLE t8 ref b_i b_i 5 test.t7.b 2 Using where; Using join buffer
|
||||
1 SIMPLE t7 ref b_i b_i 5 test.t5.b 2 Using where; Using join buffer (flat, BKA join)
|
||||
1 SIMPLE t6 ALL b_i NULL NULL NULL 3 Using where; Using join buffer (incremental, BNL join)
|
||||
1 SIMPLE t8 ref b_i b_i 5 test.t7.b 2 Using where; Using join buffer (incremental, BKA join)
|
||||
SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
|
||||
FROM t5
|
||||
LEFT JOIN
|
||||
|
|
@ -1808,9 +1808,9 @@ FROM t5 LEFT JOIN
|
|||
ON (t5.b=t8.b);
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t5 ALL NULL NULL NULL NULL 2
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 1 Using join buffer
|
||||
1 SIMPLE t7 const PRIMARY PRIMARY 4 const 1 Using join buffer
|
||||
1 SIMPLE t8 ALL b_i NULL NULL NULL 1 Using where; Using join buffer
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 1 Using join buffer (flat, BNL join)
|
||||
1 SIMPLE t7 const PRIMARY PRIMARY 4 const 1 Using join buffer (incremental, BKA join)
|
||||
1 SIMPLE t8 ALL b_i NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||||
SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
|
||||
FROM t5 LEFT JOIN
|
||||
(t6 LEFT JOIN t7 ON t7.a=1, t8)
|
||||
|
|
@ -1825,9 +1825,9 @@ FROM t5 LEFT JOIN
|
|||
ON (t5.b=t8.b);
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t5 ALL NULL NULL NULL NULL 2
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 1 Using join buffer
|
||||
1 SIMPLE t7 ref b_i b_i 5 const 0 Using join buffer
|
||||
1 SIMPLE t8 ALL b_i NULL NULL NULL 1 Using where; Using join buffer
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 1 Using join buffer (flat, BNL join)
|
||||
1 SIMPLE t7 ref b_i b_i 5 const 0 Using join buffer (incremental, BKA join)
|
||||
1 SIMPLE t8 ALL b_i NULL NULL NULL 1 Using where; Using join buffer (incremental, BNL join)
|
||||
SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
|
||||
FROM t5 LEFT JOIN
|
||||
(t6 LEFT JOIN t7 ON t7.b=2, t8)
|
||||
|
|
@ -1842,9 +1842,9 @@ FROM t5 LEFT JOIN
|
|||
ON (t5.b=t8.b);
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t5 ALL NULL NULL NULL NULL 2
|
||||
1 SIMPLE t8 ALL b_i NULL NULL NULL 1 Using where; Using join buffer
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 1 Using join buffer
|
||||
1 SIMPLE t7 const PRIMARY PRIMARY 4 const 1 Using join buffer
|
||||
1 SIMPLE t8 ALL b_i NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
|
||||
1 SIMPLE t6 ALL NULL NULL NULL NULL 1 Using join buffer (incremental, BNL join)
|
||||
1 SIMPLE t7 const PRIMARY PRIMARY 4 const 1 Using join buffer (incremental, BKA join)
|
||||
SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
|
||||
FROM t5 LEFT JOIN
|
||||
(t8, t6 LEFT JOIN t7 ON t7.a=1)
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue