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The patch adds the code that allows to use equi-join conditions

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for hash join in the cases when there are no suitable indexes
for these conditions.
This commit is contained in:
Igor Babaev
2011-01-04 21:59:41 -08:00
parent 77cbad4b31
commit af800fd92f
16 changed files with 1500 additions and 301 deletions
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838
mysql-test/r/join_cache.result
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72
mysql-test/r/join_nested_jcl6.result
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@ -81,9 +81,9 @@ WHERE t3.a=1 OR t3.c IS NULL;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t4 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
1 SIMPLE t4 hash NULL hj_key 5 test.t2.b 2 100.00 Using where; Using join buffer (incremental, BNLH join)
Warnings:
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`))
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`) and (`test`.`t2`.`b` is not null))) where ((`test`.`t3`.`a` = 1) or isnull(`test`.`t3`.`c`))
SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
FROM t2
LEFT JOIN
@ -157,10 +157,10 @@ WHERE t3.a>1 OR t3.c IS NULL;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t4 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
1 SIMPLE t4 hash NULL hj_key 5 test.t2.b 2 100.00 Using where; Using join buffer (incremental, BNLH join)
1 SIMPLE t5 ALL NULL NULL NULL NULL 3 100.00 Using join buffer (incremental, BNL join)
Warnings:
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`))
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`) and (`test`.`t2`.`b` is not null))) where ((`test`.`t3`.`a` > 1) or isnull(`test`.`t3`.`c`))
SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,t5.a,t5.b
FROM t2
LEFT JOIN
@ -187,10 +187,10 @@ WHERE (t3.a>1 OR t3.c IS NULL) AND
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t4 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
1 SIMPLE t4 hash NULL hj_key 5 test.t2.b 2 100.00 Using where; Using join buffer (incremental, BNLH join)
1 SIMPLE t5 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (incremental, BNL join)
Warnings:
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`)))
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`) and (`test`.`t2`.`b` is not null))) where (((`test`.`t3`.`a` > 1) or isnull(`test`.`t3`.`c`)) and ((`test`.`t5`.`a` < 3) or isnull(`test`.`t5`.`c`)))
SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,t5.a,t5.b
FROM t2
LEFT JOIN
@ -237,9 +237,9 @@ ON t7.b=t8.b AND t6.b < 10;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t7 ALL NULL NULL NULL NULL 2 100.00
1 SIMPLE t6 ALL NULL NULL NULL NULL 3 100.00 Using join buffer (flat, BNL join)
1 SIMPLE t8 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
1 SIMPLE t8 hash NULL hj_key 5 test.t7.b 2 100.00 Using where; Using join buffer (incremental, BNLH join)
Warnings:
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`.`t6`.`b` < 10) and (`test`.`t8`.`b` = `test`.`t7`.`b`))) where 1
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`.`t6`.`b` < 10) and (`test`.`t8`.`b` = `test`.`t7`.`b`)) and (`test`.`t7`.`b` is not null))) where 1
SELECT t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
FROM (t6, t7)
LEFT JOIN
@ -551,16 +551,16 @@ t0.b=t1.b AND
(t2.a >= 4 OR t2.c IS NULL);
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 (flat, BNL join)
1 SIMPLE t1 hash NULL hj_key 5 test.t0.b 3 100.00 Using where; Using join buffer (flat, BNLH 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 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
1 SIMPLE t4 hash NULL hj_key 5 test.t2.b 2 100.00 Using where; Using join buffer (incremental, BNLH join)
1 SIMPLE t5 ALL NULL NULL NULL NULL 3 100.00 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 t7 hash NULL hj_key 5 test.t5.b 2 100.00 Using where; Using join buffer (incremental, BNLH 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 t8 hash NULL hj_key 5 test.t5.b 2 100.00 Using where; Using join buffer (incremental, BNLH 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` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on(((`test`.`t3`.`a` = 1) and (`test`.`t4`.`b` = `test`.`t2`.`b`))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t6`.`b` < 10) and ((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t8`.`b` = `test`.`t5`.`b`))))) on(((`test`.`t6`.`b` >= 2) and (`test`.`t7`.`b` = `test`.`t5`.`b`)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and (((`test`.`t1`.`b` = `test`.`t0`.`b`) 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`)))
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`.`t3`.`a` = 1) and (`test`.`t4`.`b` = `test`.`t2`.`b`)) and (`test`.`t2`.`b` is not null))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on((((`test`.`t6`.`b` < 10) and ((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t8`.`b` = `test`.`t5`.`b`))) and (`test`.`t5`.`b` is not null)))) on((((`test`.`t6`.`b` >= 2) and (`test`.`t7`.`b` = `test`.`t5`.`b`)) and (`test`.`t5`.`b` is not null)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and (((`test`.`t1`.`b` = `test`.`t0`.`b`) 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`)))
SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
FROM t0,t1
@ -646,17 +646,17 @@ 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 (flat, BNL join)
1 SIMPLE t1 hash NULL hj_key 5 test.t0.b 3 100.00 Using where; Using join buffer (flat, BNLH 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 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
1 SIMPLE t4 hash NULL hj_key 5 test.t2.b 2 100.00 Using where; Using join buffer (incremental, BNLH join)
1 SIMPLE t5 ALL NULL 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 t7 hash NULL hj_key 5 test.t5.b 2 100.00 Using where; Using join buffer (incremental, BNLH 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 t8 hash NULL hj_key 5 test.t5.b 2 100.00 Using where; Using join buffer (incremental, BNLH 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`.`t3`.`a` = 1) and (`test`.`t4`.`b` = `test`.`t2`.`b`))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t6`.`b` < 10) and ((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t8`.`b` = `test`.`t5`.`b`))))) on(((`test`.`t6`.`b` >= 2) and (`test`.`t7`.`b` = `test`.`t5`.`b`)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and (((`test`.`t1`.`b` = `test`.`t0`.`b`) 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`)))
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`.`t3`.`a` = 1) and (`test`.`t4`.`b` = `test`.`t2`.`b`)) and (`test`.`t2`.`b` is not null))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on((((`test`.`t6`.`b` < 10) and ((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t8`.`b` = `test`.`t5`.`b`))) and (`test`.`t5`.`b` is not null)))) on((((`test`.`t6`.`b` >= 2) and (`test`.`t7`.`b` = `test`.`t5`.`b`)) and (`test`.`t5`.`b` is not null)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and (((`test`.`t1`.`b` = `test`.`t0`.`b`) 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 t9.a,t9.b
FROM t9;
a b
@ -845,9 +845,9 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3 100.00 Using where
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00 Using join buffer (flat, BNL join)
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
1 SIMPLE t4 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
1 SIMPLE t4 hash NULL hj_key 5 test.t2.b 2 100.00 Using where; Using join buffer (incremental, BNLH join)
Warnings:
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`.`t3`.`a` = 1) and (`test`.`t4`.`b` = `test`.`t2`.`b`))) where (`test`.`t1`.`a` <= 2)
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`.`t3`.`a` = 1) and (`test`.`t4`.`b` = `test`.`t2`.`b`)) and (`test`.`t2`.`b` is not null))) where (`test`.`t1`.`a` <= 2)
CREATE INDEX idx_b ON t2(b);
EXPLAIN EXTENDED
SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
@ -913,17 +913,17 @@ 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 (flat, BNL join)
1 SIMPLE t1 hash NULL hj_key 5 test.t0.b 3 100.00 Using where; Using join buffer (flat, BNLH 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 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (incremental, BNL join)
1 SIMPLE t4 hash NULL hj_key 5 test.t2.b 2 100.00 Using where; Using join buffer (incremental, BNLH join)
1 SIMPLE t5 ALL NULL 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 t7 hash NULL hj_key 5 test.t5.b 2 100.00 Using where; Using join buffer (incremental, BNLH 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 t8 hash NULL hj_key 5 test.t5.b 2 100.00 Using where; Using join buffer (incremental, BNLH 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`.`t3`.`a` = 1) and (`test`.`t4`.`b` = `test`.`t2`.`b`))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t6`.`b` < 10) and ((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t8`.`b` = `test`.`t5`.`b`))))) on(((`test`.`t6`.`b` >= 2) and (`test`.`t7`.`b` = `test`.`t5`.`b`)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and (((`test`.`t1`.`b` = `test`.`t0`.`b`) 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`)))
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`.`t3`.`a` = 1) and (`test`.`t4`.`b` = `test`.`t2`.`b`)) and (`test`.`t2`.`b` is not null))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on((((`test`.`t6`.`b` < 10) and ((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t8`.`b` = `test`.`t5`.`b`))) and (`test`.`t5`.`b` is not null)))) on((((`test`.`t6`.`b` >= 2) and (`test`.`t7`.`b` = `test`.`t5`.`b`)) and (`test`.`t5`.`b` is not null)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and (((`test`.`t1`.`b` = `test`.`t0`.`b`) 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 t4(b);
CREATE INDEX idx_b ON t5(b);
EXPLAIN EXTENDED
@ -963,17 +963,17 @@ 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 (flat, BNL join)
1 SIMPLE t1 hash NULL hj_key 5 test.t0.b 3 100.00 Using where; Using join buffer (flat, BNLH 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 t7 hash NULL hj_key 5 test.t5.b 2 100.00 Using where; Using join buffer (incremental, BNLH 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 t8 hash NULL hj_key 5 test.t5.b 2 100.00 Using where; Using join buffer (incremental, BNLH 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`.`t3`.`a` = 1) and (`test`.`t4`.`b` = `test`.`t2`.`b`)) and (`test`.`t2`.`b` is not null))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on(((`test`.`t6`.`b` < 10) and ((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t8`.`b` = `test`.`t5`.`b`))))) on(((`test`.`t6`.`b` >= 2) and (`test`.`t7`.`b` = `test`.`t5`.`b`)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and (((`test`.`t1`.`b` = `test`.`t0`.`b`) 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`)))
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`.`t3`.`a` = 1) and (`test`.`t4`.`b` = `test`.`t2`.`b`)) and (`test`.`t2`.`b` is not null))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on((((`test`.`t6`.`b` < 10) and ((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t8`.`b` = `test`.`t5`.`b`))) and (`test`.`t5`.`b` is not null)))) on((((`test`.`t6`.`b` >= 2) and (`test`.`t7`.`b` = `test`.`t5`.`b`)) and (`test`.`t5`.`b` is not null)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and (((`test`.`t1`.`b` = `test`.`t0`.`b`) 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);
EXPLAIN EXTENDED
SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
@ -1012,17 +1012,17 @@ 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 (flat, BNL join)
1 SIMPLE t1 hash NULL hj_key 5 test.t0.b 3 100.00 Using where; Using join buffer (flat, BNLH 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 t7 hash NULL hj_key 5 test.t5.b 2 100.00 Using where; Using join buffer (incremental, BNLH 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`.`t3`.`a` = 1) and (`test`.`t4`.`b` = `test`.`t2`.`b`)) and (`test`.`t2`.`b` is not null))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on((((`test`.`t6`.`b` < 10) and ((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t8`.`b` = `test`.`t5`.`b`))) and (`test`.`t5`.`b` is not null)))) on(((`test`.`t6`.`b` >= 2) and (`test`.`t7`.`b` = `test`.`t5`.`b`)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and (((`test`.`t1`.`b` = `test`.`t0`.`b`) 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`)))
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`.`t3`.`a` = 1) and (`test`.`t4`.`b` = `test`.`t2`.`b`)) and (`test`.`t2`.`b` is not null))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on((((`test`.`t6`.`b` < 10) and ((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t8`.`b` = `test`.`t5`.`b`))) and (`test`.`t5`.`b` is not null)))) on((((`test`.`t6`.`b` >= 2) and (`test`.`t7`.`b` = `test`.`t5`.`b`)) and (`test`.`t5`.`b` is not null)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and (((`test`.`t1`.`b` = `test`.`t0`.`b`) 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);
CREATE INDEX idx_a ON t0(a);
EXPLAIN EXTENDED
@ -1067,12 +1067,12 @@ 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 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 t7 hash NULL hj_key 5 test.t5.b 2 100.00 Using where; Using join buffer (incremental, BNLH 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 t8 ref idx_b idx_b 5 test.t7.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`.`t3`.`a` = 1) and (`test`.`t4`.`b` = `test`.`t2`.`b`)) and (`test`.`t2`.`b` is not null))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on((((`test`.`t6`.`b` < 10) and ((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t8`.`b` = `test`.`t5`.`b`))) and (`test`.`t5`.`b` is not null)))) on(((`test`.`t6`.`b` >= 2) and (`test`.`t7`.`b` = `test`.`t5`.`b`)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and (((`test`.`t1`.`b` = `test`.`t0`.`b`) 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`)))
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`.`t3`.`a` = 1) and (`test`.`t4`.`b` = `test`.`t2`.`b`)) and (`test`.`t2`.`b` is not null))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on((((`test`.`t6`.`b` < 10) and ((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t8`.`b` = `test`.`t5`.`b`))) and (`test`.`t7`.`b` is not null)))) on((((`test`.`t6`.`b` >= 2) and (`test`.`t7`.`b` = `test`.`t5`.`b`)) and (`test`.`t5`.`b` is not null)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and (((`test`.`t1`.`b` = `test`.`t0`.`b`) 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,
t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b
FROM t0,t1
@ -1324,7 +1324,7 @@ 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 (flat, BNL join)
1 SIMPLE t2 hash NULL hj_key 5 test.t1.c11 0 Using where; Using join buffer (flat, BNLH 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);

12
mysql-test/r/join_outer_jcl6.result
View File

@ -319,11 +319,11 @@ Lilliana Angelovska NULL NULL
explain select t1.name, t2.name, t2.id from t1 left join t2 on (t1.id = t2.owner) where t2.id is null;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using where; Not exists; Using join buffer (flat, BNL join)
1 SIMPLE t2 hash NULL hj_key 2 test.t1.id 3 Using where; Not exists; Using join buffer (flat, BNLH join)
explain select t1.name, t2.name, t2.id from t1 left join t2 on (t1.id = t2.owner) where t2.name is null;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t2 hash NULL hj_key 2 test.t1.id 3 Using where; Using join buffer (flat, BNLH join)
select count(*) from t1 left join t2 on (t1.id = t2.owner);
count(*)
4
@ -339,11 +339,11 @@ Lilliana Angelovska NULL NULL
explain select t1.name, t2.name, t2.id from t2 right join t1 on (t1.id = t2.owner) where t2.id is null;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using where; Not exists; Using join buffer (flat, BNL join)
1 SIMPLE t2 hash NULL hj_key 2 test.t1.id 3 Using where; Not exists; Using join buffer (flat, BNLH join)
explain select t1.name, t2.name, t2.id from t2 right join t1 on (t1.id = t2.owner) where t2.name is null;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t2 hash NULL hj_key 2 test.t1.id 3 Using where; Using join buffer (flat, BNLH join)
select count(*) from t2 right join t1 on (t1.id = t2.owner);
count(*)
4
@ -695,8 +695,8 @@ a1 a2 b1 b2 c1 c2
explain select * from t1 left join t2 on b1 = a1 left join t3 on c1 = a1 and b1 is null;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
1 SIMPLE t2 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t3 ALL NULL NULL NULL NULL 2 Using where; Using join buffer (incremental, BNL join)
1 SIMPLE t2 hash NULL hj_key 4 test.t1.a1 2 Using where; Using join buffer (flat, BNLH join)
1 SIMPLE t3 hash NULL hj_key 5 test.t1.a1 2 Using where; Using join buffer (incremental, BNLH join)
drop table t1, t2, t3;
create table t1 (
a int(11),

32
mysql-test/r/select_jcl6.result
View File

@ -1370,7 +1370,7 @@ id select_type table type possible_keys key key_len ref rows Extra
explain select t2.companynr,companyname from t4 left join t2 using (companynr) where t2.companynr is null;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t4 ALL NULL NULL NULL NULL 12
1 SIMPLE t2 ALL NULL NULL NULL NULL 1200 Using where; Not exists; Using join buffer (flat, BNL join)
1 SIMPLE t2 hash NULL hj_key 1 test.t4.companynr 1200 Using where; Not exists; Using join buffer (flat, BNLH join)
select companynr,companyname from t2 left join t4 using (companynr) where companynr is null;
companynr companyname
select count(*) from t2 left join t4 using (companynr) where companynr is not null;
@ -1398,39 +1398,39 @@ id select_type table type possible_keys key key_len ref rows Extra
explain select companynr,companyname from t4 left join t2 using (companynr) where companynr > 0;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t4 ALL PRIMARY NULL NULL NULL 12 Using where
1 SIMPLE t2 ALL NULL NULL NULL NULL 1199 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t2 hash NULL hj_key 1 test.t4.companynr 1199 Using where; Using join buffer (flat, BNLH join)
explain select companynr,companyname from t4 left join t2 using (companynr) where companynr > 0 or companynr < 0;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t4 ALL PRIMARY NULL NULL NULL 12 Using where
1 SIMPLE t2 ALL NULL NULL NULL NULL 1199 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t2 hash NULL hj_key 1 test.t4.companynr 1199 Using where; Using join buffer (flat, BNLH join)
explain select companynr,companyname from t4 left join t2 using (companynr) where companynr > 0 and companynr > 0;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t4 ALL PRIMARY NULL NULL NULL 12 Using where
1 SIMPLE t2 ALL NULL NULL NULL NULL 1199 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t2 hash NULL hj_key 1 test.t4.companynr 1199 Using where; Using join buffer (flat, BNLH join)
explain select t2.companynr,companyname from t4 left join t2 using (companynr) where t2.companynr > 0 or t2.companynr is null;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t4 ALL NULL NULL NULL NULL 12
1 SIMPLE t2 ALL NULL NULL NULL NULL 1199 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t2 hash NULL hj_key 1 test.t4.companynr 1199 Using where; Using join buffer (flat, BNLH join)
explain select t2.companynr,companyname from t4 left join t2 using (companynr) where t2.companynr > 0 or t2.companynr < 0 or t4.companynr > 0;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t4 ALL PRIMARY NULL NULL NULL 12
1 SIMPLE t2 ALL NULL NULL NULL NULL 1199 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t2 hash NULL hj_key 1 test.t4.companynr 1199 Using where; Using join buffer (flat, BNLH join)
explain select t2.companynr,companyname from t4 left join t2 using (companynr) where ifnull(t2.companynr,1)>0;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t4 ALL NULL NULL NULL NULL 12
1 SIMPLE t2 ALL NULL NULL NULL NULL 1199 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t2 hash NULL hj_key 1 test.t4.companynr 1199 Using where; Using join buffer (flat, BNLH join)
explain select companynr,companyname from t4 left join t2 using (companynr) where companynr > 0 or companynr is null;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t4 ALL PRIMARY NULL NULL NULL 12 Using where
1 SIMPLE t2 ALL NULL NULL NULL NULL 1199 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t2 hash NULL hj_key 1 test.t4.companynr 1199 Using where; Using join buffer (flat, BNLH join)
explain select companynr,companyname from t4 left join t2 using (companynr) where companynr > 0 or companynr < 0 or companynr > 0;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t4 ALL PRIMARY NULL NULL NULL 12 Using where
1 SIMPLE t2 ALL NULL NULL NULL NULL 1199 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t2 hash NULL hj_key 1 test.t4.companynr 1199 Using where; Using join buffer (flat, BNLH join)
explain select companynr,companyname from t4 left join t2 using (companynr) where ifnull(companynr,1)>0;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t4 ALL NULL NULL NULL NULL 12 Using where
1 SIMPLE t2 ALL NULL NULL NULL NULL 1199 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t2 hash NULL hj_key 1 test.t4.companynr 1199 Using where; Using join buffer (flat, BNLH join)
select distinct t2.companynr,t4.companynr from t2,t4 where t2.companynr=t4.companynr+1;
companynr companynr
37 36
@ -1438,7 +1438,7 @@ companynr companynr
explain select distinct t2.companynr,t4.companynr from t2,t4 where t2.companynr=t4.companynr+1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t4 index NULL PRIMARY 1 NULL 12 Using index; Using temporary
1 SIMPLE t2 ALL NULL NULL NULL NULL 1199 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t2 hash NULL hj_key 1 func 1199 Using where; Using join buffer (flat, BNLH join)
select t2.fld1,t2.companynr,fld3,period from t3,t2 where t2.fld1 = 38208 and t2.fld1=t3.t2nr and period = 1008 or t2.fld1 = 38008 and t2.fld1 =t3.t2nr and period = 1008;
fld1 companynr fld3 period
038008 37 reporters 1008
@ -2337,7 +2337,7 @@ id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t3 system NULL NULL NULL NULL 0 const row not found
1 SIMPLE t4 const id4 NULL NULL NULL 1
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
1 SIMPLE t2 ALL NULL NULL NULL NULL 1 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t2 hash NULL hj_key 4 test.t1.id1 1 Using where; Using join buffer (flat, BNLH join)
select * from t1 left join t2 on id1 = id2 left join t3 on id1 = id3
left join t4 on id3 = id4 where id2 = 1 or id4 = 1;
id1 id2 id3 id4 id44
@ -2916,12 +2916,12 @@ a
4
EXPLAIN SELECT t1.a FROM t1 STRAIGHT_JOIN t2 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 5
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t1 ALL NULL NULL NULL NULL 5 Using where
1 SIMPLE t2 hash NULL hj_key 5 test.t1.a 3 Using where; Using join buffer (flat, BNLH join)
EXPLAIN SELECT t1.a FROM t1 INNER JOIN t2 ON t1.a=t2.a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2 ALL NULL NULL NULL NULL 3
1 SIMPLE t1 ALL NULL NULL NULL NULL 5 Using where; Using join buffer (flat, BNL join)
1 SIMPLE t2 ALL NULL NULL NULL NULL 3 Using where
1 SIMPLE t1 hash NULL hj_key 5 test.t2.a 5 Using where; Using join buffer (flat, BNLH join)
DROP TABLE t1,t2;
select x'10' + 0, X'10' + 0, b'10' + 0, B'10' + 0;
x'10' + 0 X'10' + 0 b'10' + 0 B'10' + 0

22
mysql-test/r/subselect3_jcl6.result
View File

@ -1031,10 +1031,10 @@ explain select t21.* from t21,t22 where t21.a = t22.a and
t22.a in (select t12.a from t11, t12 where t11.a in(255,256) and t11.a = t12.a and t11.c is null) and t22.c is null order by t21.a;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY subselect2 ALL unique_key NULL NULL NULL 8 Using temporary; Using filesort
1 PRIMARY t21 ALL NULL NULL NULL NULL 26 Using where; Using join buffer (flat, BNL join)
1 PRIMARY t22 ALL NULL NULL NULL NULL 26 Using where; Using join buffer (incremental, BNL join)
1 PRIMARY t21 hash NULL hj_key 4 test.t11.a 26 Using where; Using join buffer (flat, BNLH join)
1 PRIMARY t22 hash NULL hj_key 4 test.t21.a 26 Using where; Using join buffer (incremental, BNLH join)
2 SUBQUERY t11 ALL NULL NULL NULL NULL 8 Using where
2 SUBQUERY t12 ALL NULL NULL NULL NULL 8 Using where; Using join buffer (flat, BNL join)
2 SUBQUERY t12 hash NULL hj_key 4 test.t11.a 8 Using where; Using join buffer (flat, BNLH join)
select t21.* from t21,t22 where t21.a = t22.a and
t22.a in (select t12.a from t11, t12 where t11.a in(255,256) and t11.a = t12.a and t11.c is null) and t22.c is null order by t21.a;
a b c
@ -1151,11 +1151,11 @@ set @@optimizer_switch='firstmatch=off,materialization=off';
set @@max_heap_table_size= 16384;
explain select count(*) from t0 A, t0 B, t0 C, t0 D where D.a in (select a from t1 E);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY E ALL NULL NULL NULL NULL 5 Start temporary
1 PRIMARY E ALL NULL NULL NULL NULL 5 Using where; Start temporary
1 PRIMARY A ALL NULL NULL NULL NULL 10 Using join buffer (flat, BNL join)
1 PRIMARY B ALL NULL NULL NULL NULL 10 Using join buffer (incremental, BNL join)
1 PRIMARY C ALL NULL NULL NULL NULL 10 Using join buffer (incremental, BNL join)
1 PRIMARY D ALL NULL NULL NULL NULL 10 Using where; End temporary; Using join buffer (incremental, BNL join)
1 PRIMARY D hash NULL hj_key 5 test.E.a 10 Using where; End temporary; Using join buffer (incremental, BNLH join)
flush status;
select count(*) from t0 A, t0 B, t0 C, t0 D where D.a in (select a from t1 E);
count(*)
@ -1192,12 +1192,12 @@ insert into t3 select * from t1;
insert into t3 values (1),(2);
explain select * from t2 where a in (select a from t1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Start temporary
1 PRIMARY t1 ALL NULL NULL NULL NULL 4 Using where; End temporary; Using join buffer (flat, BNL join)
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where; Start temporary
1 PRIMARY t1 hash NULL hj_key 4 test.t2.a 4 Using where; End temporary; Using join buffer (flat, BNLH join)
explain select * from t2 where a in (select a from t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Start temporary
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where; End temporary; Using join buffer (flat, BNL join)
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Using where; Start temporary
1 PRIMARY t2 hash NULL hj_key 5 test.t2.a 2 Using where; End temporary; Using join buffer (flat, BNLH join)
explain select * from t2 where a in (select a from t3);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 Start temporary
@ -1211,8 +1211,8 @@ create table t1 (a decimal);
insert into t1 values (1),(2);
explain select * from t1 where a in (select a from t1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Start temporary
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where; End temporary; Using join buffer (flat, BNL join)
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where; Start temporary
1 PRIMARY t1 hash NULL hj_key 6 test.t1.a 2 Using where; End temporary; Using join buffer (flat, BNLH join)
drop table t1;
set @@optimizer_switch=@save_optimizer_switch;
create table t1 (a int);

10
mysql-test/r/subselect_sj2_jcl6.result
View File

@ -138,8 +138,8 @@ a, mid(filler1, 1,10), length(filler1)=length(filler2) as Z
from t1 ot where a in (select a from t2 it);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY subselect2 ALL unique_key NULL NULL NULL 22
1 PRIMARY ot ALL NULL NULL NULL NULL 32 Using where; Using join buffer (flat, BNL join)
2 SUBQUERY it ALL NULL NULL NULL NULL 22
1 PRIMARY ot hash NULL hj_key 5 test.it.a 32 Using where; Using join buffer (flat, BNLH join)
2 SUBQUERY it ALL NULL NULL NULL NULL 22 Using where
select
a, mid(filler1, 1,10), length(filler1)=length(filler2) as Z
from t1 ot where a in (select a from t2 it);
@ -206,8 +206,8 @@ a, mid(filler1, 1,10), length(filler1)=length(filler2) as Z
from t1 ot where a in (select a from t2 it);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY subselect2 ALL unique_key NULL NULL NULL 22
1 PRIMARY ot ALL NULL NULL NULL NULL 52 Using where; Using join buffer (flat, BNL join)
2 SUBQUERY it ALL NULL NULL NULL NULL 22
1 PRIMARY ot hash NULL hj_key 5 test.it.a 52 Using where; Using join buffer (flat, BNLH join)
2 SUBQUERY it ALL NULL NULL NULL NULL 22 Using where
select
a, mid(filler1, 1,10), length(filler1)=length(filler2) as Z
from t1 ot where a in (select a from t2 it);
@ -588,7 +588,7 @@ explain
select * from t1 left join t2 on (t2.a= t1.a and t2.a in (select pk from t3));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3
1 PRIMARY t2 ALL NULL NULL NULL NULL 3 Using where; Using join buffer (flat, BNL join)
1 PRIMARY t2 hash NULL hj_key 5 test.t1.a 3 Using where; Using join buffer (flat, BNLH join)
2 DEPENDENT SUBQUERY t3 unique_subquery PRIMARY PRIMARY 4 func 1 Using index
drop table t0, t1, t2, t3;
create table t1 (a int);

1
mysql-test/r/subselect_sj_jcl6.result
View File

@ -1,6 +1,7 @@
set @save_optimizer_switch_jcl6=@@optimizer_switch;
set @@optimizer_switch='semijoin_with_cache=on';
set @@optimizer_switch='outer_join_with_cache=on';
set @@optimizer_switch='join_cache_hashed=off';
set join_cache_level=6;
show variables like 'join_cache_level';
Variable_name Value

2
mysql-test/suite/innodb/r/innodb_mysql.result
View File

@ -2656,7 +2656,7 @@ SELECT t1.pk FROM t1,t2
WHERE t1.pk = t2.pk AND t2.pk <> 8;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index PRIMARY PRIMARY 4 NULL 11 Using where; Using index
1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t1.pk 1 Using index; Using join buffer (flat, BNLH join)
1 SIMPLE t2 hash PRIMARY PRIMARY 4 test.t1.pk 13 Using index; Using join buffer (flat, BNLH join)
SELECT t1.pk FROM t1,t2
WHERE t1.pk = t2.pk AND t2.pk <> 8;
pk

116
mysql-test/t/join_cache.test
View File

@ -58,6 +58,60 @@ SELECT City.Name, Country.Name, CountryLanguage.Language
set join_cache_level=2;
show variables like 'join_cache_level';
EXPLAIN
SELECT City.Name, Country.Name FROM City,Country
WHERE City.Country=Country.Code AND
Country.Name LIKE 'L%' AND City.Population > 100000;
SELECT City.Name, Country.Name FROM City,Country
WHERE City.Country=Country.Code AND
Country.Name LIKE 'L%' AND City.Population > 100000;
EXPLAIN
SELECT City.Name, Country.Name, CountryLanguage.Language
FROM City,Country,CountryLanguage
WHERE City.Country=Country.Code AND
CountryLanguage.Country=Country.Code AND
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
CountryLanguage.Percentage > 50;
SELECT City.Name, Country.Name, CountryLanguage.Language
FROM City,Country,CountryLanguage
WHERE City.Country=Country.Code AND
CountryLanguage.Country=Country.Code AND
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
CountryLanguage.Percentage > 50;
set join_cache_level=3;
show variables like 'join_cache_level';
EXPLAIN
SELECT City.Name, Country.Name FROM City,Country
WHERE City.Country=Country.Code AND
Country.Name LIKE 'L%' AND City.Population > 100000;
SELECT City.Name, Country.Name FROM City,Country
WHERE City.Country=Country.Code AND
Country.Name LIKE 'L%' AND City.Population > 100000;
EXPLAIN
SELECT City.Name, Country.Name, CountryLanguage.Language
FROM City,Country,CountryLanguage
WHERE City.Country=Country.Code AND
CountryLanguage.Country=Country.Code AND
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
CountryLanguage.Percentage > 50;
SELECT City.Name, Country.Name, CountryLanguage.Language
FROM City,Country,CountryLanguage
WHERE City.Country=Country.Code AND
CountryLanguage.Country=Country.Code AND
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
CountryLanguage.Percentage > 50;
set join_cache_level=4;
show variables like 'join_cache_level';
EXPLAIN
SELECT City.Name, Country.Name FROM City,Country
WHERE City.Country=Country.Code AND
@ -116,6 +170,60 @@ SELECT City.Name, Country.Name, CountryLanguage.Language
set join_cache_level=2;
show variables like 'join_cache_level';
EXPLAIN
SELECT City.Name, Country.Name FROM City,Country
WHERE City.Country=Country.Code AND
Country.Name LIKE 'L%' AND City.Population > 100000;
SELECT City.Name, Country.Name FROM City,Country
WHERE City.Country=Country.Code AND
Country.Name LIKE 'L%' AND City.Population > 100000;
EXPLAIN
SELECT City.Name, Country.Name, CountryLanguage.Language
FROM City,Country,CountryLanguage
WHERE City.Country=Country.Code AND
CountryLanguage.Country=Country.Code AND
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
CountryLanguage.Percentage > 50;
SELECT City.Name, Country.Name, CountryLanguage.Language
FROM City,Country,CountryLanguage
WHERE City.Country=Country.Code AND
CountryLanguage.Country=Country.Code AND
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
CountryLanguage.Percentage > 50;
set join_cache_level=3;
show variables like 'join_cache_level';
EXPLAIN
SELECT City.Name, Country.Name FROM City,Country
WHERE City.Country=Country.Code AND
Country.Name LIKE 'L%' AND City.Population > 100000;
SELECT City.Name, Country.Name FROM City,Country
WHERE City.Country=Country.Code AND
Country.Name LIKE 'L%' AND City.Population > 100000;
EXPLAIN
SELECT City.Name, Country.Name, CountryLanguage.Language
FROM City,Country,CountryLanguage
WHERE City.Country=Country.Code AND
CountryLanguage.Country=Country.Code AND
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
CountryLanguage.Percentage > 50;
SELECT City.Name, Country.Name, CountryLanguage.Language
FROM City,Country,CountryLanguage
WHERE City.Country=Country.Code AND
CountryLanguage.Country=Country.Code AND
City.Name LIKE 'L%' AND Country.Population > 3000000 AND
CountryLanguage.Percentage > 50;
set join_cache_level=4;
show variables like 'join_cache_level';
EXPLAIN
SELECT City.Name, Country.Name FROM City,Country
WHERE City.Country=Country.Code AND
@ -2642,13 +2750,13 @@ SET SESSION optimizer_switch = 'outer_join_with_cache=on';
SET SESSION join_cache_level = 6;
EXPLAIN
SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON t3.a3 = t2.a2 ON t3.b3 <> 0 ;
SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON t3.a3 = t2.a2 ON t3.b3 <> 0 ;
SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON t3.a3 = t2.a2 ON t3.b3 <> 0;
SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON t3.a3 = t2.a2 ON t3.b3 <> 0;
SET SESSION join_cache_level = 5;
EXPLAIN
SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON t3.a3 = t2.a2 ON t3.b3 <> 0 ;
SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON t3.a3 = t2.a2 ON t3.b3 <> 0 ;
SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON t3.a3 = t2.a2 ON t3.b3 <> 0;
SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON t3.a3 = t2.a2 ON t3.b3 <> 0;
SET SESSION optimizer_switch = 'outer_join_with_cache=off';
SET SESSION join_cache_level = DEFAULT;

1
mysql-test/t/subselect_sj_jcl6.test
View File

@ -5,6 +5,7 @@
set @save_optimizer_switch_jcl6=@@optimizer_switch;
set @@optimizer_switch='semijoin_with_cache=on';
set @@optimizer_switch='outer_join_with_cache=on';
set @@optimizer_switch='join_cache_hashed=off';
set join_cache_level=6;
show variables like 'join_cache_level';

10
sql/opt_subselect.cc
View File

@ -1326,13 +1326,19 @@ static uint get_tmp_table_rec_length(List<Item> &items)
bool find_eq_ref_candidate(TABLE *table, table_map sj_inner_tables)
{
KEYUSE *keyuse= table->reginfo.join_tab->keyuse;
uint key;
if (keyuse)
{
while (1) /* For each key */
{
key= keyuse->key;
if (keyuse->is_for_hash_join())
{
keyuse++;
if (keyuse->table != table)
return FALSE;
continue;
}
uint key= keyuse->key;
KEY *keyinfo= table->key_info + key;
key_part_map bound_parts= 0;
if (keyinfo->flags & HA_NOSAME)

7
sql/sql_join_cache.cc
View File

@ -1052,9 +1052,8 @@ bool JOIN_CACHE::check_emb_key_usage()
CACHE_FIELD *copy;
CACHE_FIELD *copy_end;
uint len= 0;
TABLE *table= join_tab->table;
TABLE_REF *ref= &join_tab->ref;
KEY *keyinfo= table->key_info+ref->key;
KEY *keyinfo= join_tab->get_keyinfo_by_key_no(ref->key);
/*
If some of the key arguments are not from the local cache the key
@ -2520,7 +2519,7 @@ int JOIN_CACHE_HASHED::init()
pack_length+= get_size_of_rec_offset();
pack_length_with_blob_ptrs+= get_size_of_rec_offset();
ref_key_info= join_tab->table->key_info+join_tab->ref.key;
ref_key_info= join_tab->get_keyinfo_by_key_no(join_tab->ref.key);
ref_used_key_parts= join_tab->ref.key_parts;
hash_func= &JOIN_CACHE_HASHED::get_hash_idx_simple;
@ -3427,7 +3426,7 @@ uchar *JOIN_CACHE_BNLH::get_matching_chain_by_join_key()
uchar *key_ref_ptr;
TABLE *table= join_tab->table;
TABLE_REF *ref= &join_tab->ref;
KEY *keyinfo= table->key_info+ref->key;
KEY *keyinfo= join_tab->get_keyinfo_by_key_no(ref->key);
/* Build the join key value out of the record in the record buffer */
key_copy(key_buff, table->record[0], keyinfo, key_length, TRUE);
/* Look for this key in the join buffer */

545
sql/sql_select.cc
View File

@ -48,7 +48,7 @@
const char *join_type_str[]={ "UNKNOWN","system","const","eq_ref","ref",
"MAYBE_REF","ALL","range","index","fulltext",
"ref_or_null","unique_subquery","index_subquery",
"index_merge"
"index_merge","hash"
};
struct st_sargable_param;
@ -753,6 +753,8 @@ JOIN::optimize()
thd_proc_info(thd, "optimizing");
set_allowed_join_cache_types();
/* dump_TABLE_LIST_graph(select_lex, select_lex->leaf_tables); */
if (convert_join_subqueries_to_semijoins(this))
DBUG_RETURN(1); /* purecov: inspected */
@ -2985,7 +2987,7 @@ make_join_statistics(JOIN *join, TABLE_LIST *tables_arg, COND *conds,
TODO. Apply single row substitution to null complemented inner tables
for nested outer join operations.
*/
while (keyuse->table == table)
while (keyuse->table == table && !keyuse->is_for_hash_join())
{
if (!(keyuse->val->used_tables() & ~join->const_table_map) &&
keyuse->val->is_null() && keyuse->null_rejecting)
@ -3030,6 +3032,11 @@ make_join_statistics(JOIN *join, TABLE_LIST *tables_arg, COND *conds,
s->type= JT_REF;
while (keyuse->table == table)
{
if (keyuse->is_for_hash_join())
{
keyuse++;
continue;
}
start_keyuse=keyuse;
key=keyuse->key;
s->keys.set_bit(key); // TODO: remove this ?
@ -3493,21 +3500,27 @@ static uint get_semi_join_select_list_index(Field *field)
*/
static void
add_key_field(KEY_FIELD **key_fields,uint and_level, Item_func *cond,
add_key_field(JOIN *join,
KEY_FIELD **key_fields,uint and_level, Item_func *cond,
Field *field, bool eq_func, Item **value, uint num_values,
table_map usable_tables, SARGABLE_PARAM **sargables)
{
uint exists_optimize= 0;
if (!(field->flags & PART_KEY_FLAG))
uint optimize= 0;
if (eq_func && join->is_allowed_hash_join_access() &&
field->hash_join_is_possible())
{
optimize= KEY_OPTIMIZE_EQ;
}
if (!(field->flags & PART_KEY_FLAG) && !optimize)
{
// Don't remove column IS NULL on a LEFT JOIN table
if (!eq_func || (*value)->type() != Item::NULL_ITEM ||
!field->table->maybe_null || field->null_ptr)
return; // Not a key. Skip it
exists_optimize= KEY_OPTIMIZE_EXISTS;
optimize= KEY_OPTIMIZE_EXISTS;
DBUG_ASSERT(num_values == 1);
}
else
if (optimize != KEY_OPTIMIZE_EXISTS)
{
table_map used_tables=0;
bool optimizable=0;
@ -3524,7 +3537,7 @@ add_key_field(KEY_FIELD **key_fields,uint and_level, Item_func *cond,
if (!eq_func || (*value)->type() != Item::NULL_ITEM ||
!field->table->maybe_null || field->null_ptr)
return; // Can't use left join optimize
exists_optimize= KEY_OPTIMIZE_EXISTS;
optimize= KEY_OPTIMIZE_EXISTS;
}
else
{
@ -3544,7 +3557,8 @@ add_key_field(KEY_FIELD **key_fields,uint and_level, Item_func *cond,
Field BETWEEN ...
Field IN ...
*/
stat[0].key_dependent|=used_tables;
if (field->flags & PART_KEY_FLAG)
stat[0].key_dependent|=used_tables;
bool is_const=1;
for (uint i=0; i<num_values; i++)
@ -3622,8 +3636,8 @@ add_key_field(KEY_FIELD **key_fields,uint and_level, Item_func *cond,
(*key_fields)->field= field;
(*key_fields)->eq_func= eq_func;
(*key_fields)->val= *value;
(*key_fields)->level= and_level;
(*key_fields)->optimize= exists_optimize;
(*key_fields)->level= and_level;
(*key_fields)->optimize= optimize;
/*
If the condition has form "tbl.keypart = othertbl.field" and
othertbl.field can be NULL, there will be no matches if othertbl.field
@ -3670,14 +3684,14 @@ add_key_field(KEY_FIELD **key_fields,uint and_level, Item_func *cond,
*/
static void
add_key_equal_fields(KEY_FIELD **key_fields, uint and_level,
add_key_equal_fields(JOIN *join, KEY_FIELD **key_fields, uint and_level,
Item_func *cond, Item_field *field_item,
bool eq_func, Item **val,
uint num_values, table_map usable_tables,
SARGABLE_PARAM **sargables)
{
Field *field= field_item->field;
add_key_field(key_fields, and_level, cond, field,
add_key_field(join, key_fields, and_level, cond, field,
eq_func, val, num_values, usable_tables, sargables);
Item_equal *item_equal= field_item->item_equal;
if (item_equal)
@ -3692,7 +3706,7 @@ add_key_equal_fields(KEY_FIELD **key_fields, uint and_level,
{
if (!field->eq(item->field))
{
add_key_field(key_fields, and_level, cond, item->field,
add_key_field(join, key_fields, and_level, cond, item->field,
eq_func, val, num_values, usable_tables,
sargables);
}
@ -3825,7 +3839,7 @@ add_key_fields(JOIN *join, KEY_FIELD **key_fields, uint *and_level,
values--;
DBUG_ASSERT(cond_func->functype() != Item_func::IN_FUNC ||
cond_func->argument_count() != 2);
add_key_equal_fields(key_fields, *and_level, cond_func,
add_key_equal_fields(join, key_fields, *and_level, cond_func,
(Item_field*) (cond_func->key_item()->real_item()),
0, values,
cond_func->argument_count()-1,
@ -3840,7 +3854,7 @@ add_key_fields(JOIN *join, KEY_FIELD **key_fields, uint *and_level,
if (is_local_field (cond_func->arguments()[i]))
{
field_item= (Item_field *) (cond_func->arguments()[i]->real_item());
add_key_equal_fields(key_fields, *and_level, cond_func,
add_key_equal_fields(join, key_fields, *and_level, cond_func,
field_item, 0, values, 1, usable_tables,
sargables);
}
@ -3855,7 +3869,7 @@ add_key_fields(JOIN *join, KEY_FIELD **key_fields, uint *and_level,
if (is_local_field (cond_func->arguments()[0]))
{
add_key_equal_fields(key_fields, *and_level, cond_func,
add_key_equal_fields(join, key_fields, *and_level, cond_func,
(Item_field*) (cond_func->arguments()[0])->real_item(),
equal_func,
cond_func->arguments()+1, 1, usable_tables,
@ -3864,7 +3878,7 @@ add_key_fields(JOIN *join, KEY_FIELD **key_fields, uint *and_level,
if (is_local_field (cond_func->arguments()[1]) &&
cond_func->functype() != Item_func::LIKE_FUNC)
{
add_key_equal_fields(key_fields, *and_level, cond_func,
add_key_equal_fields(join, key_fields, *and_level, cond_func,
(Item_field*) (cond_func->arguments()[1])->real_item(),
equal_func,
cond_func->arguments(),1,usable_tables,
@ -3880,7 +3894,7 @@ add_key_fields(JOIN *join, KEY_FIELD **key_fields, uint *and_level,
Item *tmp=new Item_null;
if (unlikely(!tmp)) // Should never be true
return;
add_key_equal_fields(key_fields, *and_level, cond_func,
add_key_equal_fields(join, key_fields, *and_level, cond_func,
(Item_field*) (cond_func->arguments()[0])->real_item(),
cond_func->functype() == Item_func::ISNULL_FUNC,
&tmp, 1, usable_tables, sargables);
@ -3900,7 +3914,7 @@ add_key_fields(JOIN *join, KEY_FIELD **key_fields, uint *and_level,
*/
while ((item= it++))
{
add_key_field(key_fields, *and_level, cond_func, item->field,
add_key_field(join, key_fields, *and_level, cond_func, item->field,
TRUE, &const_item, 1, usable_tables, sargables);
}
}
@ -3921,7 +3935,7 @@ add_key_fields(JOIN *join, KEY_FIELD **key_fields, uint *and_level,
if (!field->eq(item->field))
{
Item *tmp_item= item;
add_key_field(key_fields, *and_level, cond_func, field,
add_key_field(join, key_fields, *and_level, cond_func, field,
TRUE, &tmp_item, 1, usable_tables,
sargables);
}
@ -3942,6 +3956,58 @@ max_part_bit(key_part_map bits)
return found;
}
/**
Add a new keuse to the specified array of KEYUSE objects
@param[in,out] keyuse_array array of keyuses to be extended
@param[in] key_field info on the key use occurrence
@param[in] key key number for the keyse to be added
@param[in] part key part for the keyuse to be added
@note
The function builds a new KEYUSE object for a key use utilizing the info
on the left anf right parts of the given key use extracted from the
structure key_field, the key number and key part for this key use.
The built object is added to the dynamic array keyuse_array.
@retval 0 the built object is succesfully added
@retval 1 otherwise
*/
static bool
add_keyuse(DYNAMIC_ARRAY *keyuse_array, KEY_FIELD *key_field,
uint key, uint part)
{
KEYUSE keyuse;
Field *field= key_field->field;
keyuse.table= field->table;
keyuse.val= key_field->val;
keyuse.key= key;
if (!is_hash_join_key_no(key))
{
keyuse.keypart=part;
keyuse.keypart_map= (key_part_map) 1 << part;
}
else
{
/*
If this is a key use for hash join then keypart of
the added element actually contains the field number.
*/
keyuse.keypart= field->field_index;
keyuse.keypart_map= (key_part_map) 0;
}
keyuse.used_tables= key_field->val->used_tables();
keyuse.optimize= key_field->optimize & KEY_OPTIMIZE_REF_OR_NULL;
keyuse.null_rejecting= key_field->null_rejecting;
keyuse.cond_guard= key_field->cond_guard;
keyuse.sj_pred_no= key_field->sj_pred_no;
return (insert_dynamic(keyuse_array,(uchar*) &keyuse));
}
/*
Add all keys with uses 'field' for some keypart
If field->and_level != and_level then only mark key_part as const_part
@ -3952,11 +4018,10 @@ max_part_bit(key_part_map bits)
*/
static bool
add_key_part(DYNAMIC_ARRAY *keyuse_array,KEY_FIELD *key_field)
add_key_part(DYNAMIC_ARRAY *keyuse_array, KEY_FIELD *key_field)
{
Field *field=key_field->field;
TABLE *form= field->table;
KEYUSE keyuse;
if (key_field->eq_func && !(key_field->optimize & KEY_OPTIMIZE_EXISTS))
{
@ -3972,22 +4037,24 @@ add_key_part(DYNAMIC_ARRAY *keyuse_array,KEY_FIELD *key_field)
{
if (field->eq(form->key_info[key].key_part[part].field))
{
keyuse.table= field->table;
keyuse.val = key_field->val;
keyuse.key = key;
keyuse.keypart=part;
keyuse.keypart_map= (key_part_map) 1 << part;
keyuse.used_tables=key_field->val->used_tables();
keyuse.optimize= key_field->optimize & KEY_OPTIMIZE_REF_OR_NULL;
keyuse.ref_table_rows= 0;
keyuse.null_rejecting= key_field->null_rejecting;
keyuse.cond_guard= key_field->cond_guard;
keyuse.sj_pred_no= key_field->sj_pred_no;
if (insert_dynamic(keyuse_array,(uchar*) &keyuse))
if (add_keyuse(keyuse_array, key_field, key, part))
return TRUE;
}
}
}
if (field->hash_join_is_possible() &&
(key_field->optimize & KEY_OPTIMIZE_EQ) &&
key_field->val->used_tables())
{
/*
If a key use is extracted from an equi-join predicate then it is
added not only as a key use for every index whose component can
be evalusted utilizing this key use, but also as a key use for
hash join. Such key uses are marked with a special key number.
*/
if (add_keyuse(keyuse_array, key_field, get_hash_join_key_no(), 0))
return TRUE;
}
}
return FALSE;
}
@ -4300,6 +4367,18 @@ update_ref_and_keys(THD *thd, DYNAMIC_ARRAY *keyuse,JOIN_TAB *join_tab,
found_eq_constant=0;
for (i=0 ; i < keyuse->elements-1 ; i++,use++)
{
if (use->is_for_hash_join())
{
if (!use->table->reginfo.join_tab->keyuse)
use->table->reginfo.join_tab->keyuse= save_pos;
#ifdef HAVE_valgrind
/* Valgrind complains about overlapped memcpy when save_pos==use. */
if (save_pos != use)
#endif
*save_pos= *use;
save_pos++;
continue;
}
if (!use->used_tables && use->optimize != KEY_OPTIMIZE_REF_OR_NULL)
use->table->const_key_parts[use->key]|= use->keypart_map;
if (use->keypart != FT_KEYPART)
@ -4518,16 +4597,21 @@ best_access_path(JOIN *join,
double tmp;
ha_rows rec;
bool best_uses_jbuf= FALSE;
MY_BITMAP *eq_join_set= &s->table->eq_join_set;
KEYUSE *start_key=0;
KEYUSE *hj_start_key= 0;
Loose_scan_opt loose_scan_opt;
DBUG_ENTER("best_access_path");
bitmap_clear_all(eq_join_set);
loose_scan_opt.init(join, s, remaining_tables);
if (s->keyuse)
{ /* Use key if possible */
TABLE *table= s->table;
KEYUSE *keyuse,*start_key=0;
KEYUSE *keyuse;
double best_records= DBL_MAX;
uint max_key_part=0;
@ -4535,15 +4619,29 @@ best_access_path(JOIN *join,
rec= s->records/MATCHING_ROWS_IN_OTHER_TABLE; // Assumed records/key
for (keyuse=s->keyuse ; keyuse->table == table ;)
{
KEY *keyinfo;
key_part_map found_part= 0;
table_map found_ref= 0;
uint key= keyuse->key;
KEY *keyinfo= table->key_info+key;
bool ft_key= (keyuse->keypart == FT_KEYPART);
/* Bitmap of keyparts where the ref access is over 'keypart=const': */
key_part_map const_part= 0;
/* The or-null keypart in ref-or-null access: */
key_part_map ref_or_null_part= 0;
if (is_hash_join_key_no(key))
{
if (!(remaining_tables & keyuse->used_tables) &&
idx > join->const_tables)
{
if (!hj_start_key)
hj_start_key= keyuse;
bitmap_set_bit(eq_join_set, keyuse->keypart);
}
keyuse++;
continue;
}
keyinfo= table->key_info+key;
/* Calculate how many key segments of the current key we can use */
start_key= keyuse;
@ -4884,6 +4982,41 @@ best_access_path(JOIN *join,
records= best_records;
}
/*
If there is no key to access the table, but there is an equi-join
predicate connecting the table with the privious tables then we
consider the possibility of using hash join.
*/
if (idx >= join->const_tables && best_key == 0 &&
!bitmap_is_clear_all(eq_join_set) && !disable_jbuf &&
(!s->emb_sj_nest ||
join->allowed_semijoin_with_cache) &&
(!(s->table->map & join->outer_join) ||
join->allowed_outer_join_with_cache))
{
double join_sel= 0.1;
/* Estimate the cost of the hash join access to the table */
ha_rows rnd_records= s->found_records;
if (found_constraint)
rnd_records-= rnd_records/4;
if (s->table->quick_condition_rows != s->found_records)
rnd_records= s->table->quick_condition_rows;
tmp= s->table->file->scan_time();
/* We read the table as many times as join buffer becomes full. */
tmp*= (1.0 + floor((double) cache_record_length(join,idx) *
record_count /
(double) thd->variables.join_buff_size));
tmp+= (s->records - rnd_records)/(double) TIME_FOR_COMPARE;
best_time= tmp +
(record_count*join_sel) / TIME_FOR_COMPARE * rnd_records;
best= tmp;
records= rows2double(rnd_records);
best_key= hj_start_key;
best_ref_depends_map= 0;
best_uses_jbuf= test(!disable_jbuf);
}
/*
Don't test table scan if it can't be better.
Prefer key lookup if we would use the same key for scanning.
@ -5001,7 +5134,8 @@ best_access_path(JOIN *join,
*/
if (best == DBL_MAX ||
(tmp + record_count/(double) TIME_FOR_COMPARE*rnd_records <
best + record_count/(double) TIME_FOR_COMPARE*records))
(best_key->is_for_hash_join() ? best_time :
best + record_count/(double) TIME_FOR_COMPARE*records)))
{
/*
If the table has a range (s->quick is set) make_join_select()
@ -5770,7 +5904,7 @@ best_extension_by_limited_search(JOIN *join,
if (best_record_count >= current_record_count &&
best_read_time >= current_read_time &&
/* TODO: What is the reasoning behind this condition? */
(!(s->key_dependent & remaining_tables) ||
(!(s->key_dependent & allowed_tables & remaining_tables) ||
join->positions[idx].records_read < 2.0))
{
best_record_count= current_record_count;
@ -5980,39 +6114,6 @@ void JOIN_TAB::calc_used_field_length(bool max_fl)
}
/**
@brief
Check whether hash join algorithm can be used to join this table
@details
This function finds out whether the ref items that have been chosen
by the planner to access this table can be used for hash join algorithms.
The answer depends on a certain property of the the fields of the
joined tables on which the hash join key is built. If hash join is
allowed for all these fields the answer is positive.
@note
The function is supposed to be called now only after the function
get_best_combination has been called.
@retval TRUE it's possible to use hash join to join this table
@retval FALSE otherwise
*/
bool JOIN_TAB::hash_join_is_possible()
{
if (type != JT_REF && type != JT_EQ_REF)
return FALSE;
KEY *keyinfo= &table->key_info[ref.key];
for (uint i= 0; i < ref.key_parts; i++)
{
if (!keyinfo->key_part[i].field->hash_join_is_possible())
return FALSE;
}
return TRUE;
}
/*
@brief
Extract pushdown conditions for a table scan
@ -6053,6 +6154,37 @@ int JOIN_TAB::make_scan_filter()
}
/**
@brief
Check whether hash join algorithm can be used to join this table
@details
This function finds out whether the ref items that have been chosen
by the planner to access this table can be used for hash join algorithms.
The answer depends on a certain property of the the fields of the
joined tables on which the hash join key is built.
@note
At present the function is supposed to be called only after the function
get_best_combination has been called.
@retval TRUE it's possible to use hash join to join this table
@retval FALSE otherwise
*/
bool JOIN_TAB::hash_join_is_possible()
{
if (type != JT_REF && type != JT_EQ_REF)
return FALSE;
if (!is_ref_for_hash_join())
{
KEY *keyinfo= table->key_info + ref.key;
return keyinfo->key_part[0].field->hash_join_is_possible();
}
return TRUE;
}
static uint
cache_record_length(JOIN *join,uint idx)
{
@ -6216,7 +6348,7 @@ get_best_combination(JOIN *join)
if (j->type == JT_SYSTEM)
continue;
if (j->keys.is_clear_all() || !(keyuse= join->best_positions[tablenr].key) ||
if ( !(keyuse= join->best_positions[tablenr].key) ||
(join->best_positions[tablenr].sj_strategy == SJ_OPT_LOOSE_SCAN))
{
j->type=JT_ALL;
@ -6234,22 +6366,108 @@ get_best_combination(JOIN *join)
DBUG_RETURN(0);
}
/**
Create a descriptor of hash join key to access a given join table
static bool create_ref_for_key(JOIN *join, JOIN_TAB *j, KEYUSE *org_keyuse,
table_map used_tables)
@param join join which the join table belongs to
@param join_tab the join table to access
@param org_keyuse beginning of the key uses to join this table
@param used_tables bitmap of the previous tables
@details
This function first finds key uses that can be utilized by the hash join
algorithm to join join_tab to the previous tables marked in the bitmap
used_tables. The tested key uses are taken from the array of all key uses
for 'join' starting from the position org_keyuse. After all interesting key
uses have been found the function builds a descriptor of the corresponding
key that is used by the hash join algorithm would it be chosen to join
the table join_tab.
@retval FALSE the descriptor for a hash join key is successfully created
@retval TRUE otherwise
*/
static bool create_hj_key_for_table(JOIN *join, JOIN_TAB *join_tab,
KEYUSE *org_keyuse, table_map used_tables)
{
KEYUSE *keyuse=org_keyuse;
bool ftkey=(keyuse->keypart == FT_KEYPART);
KEY *keyinfo;
KEY_PART_INFO *key_part_info;
KEYUSE *keyuse= org_keyuse;
uint key_parts= 0;
THD *thd= join->thd;
uint keyparts,length,key;
TABLE *table= join_tab->table;
bool first_keyuse= TRUE;
DBUG_ENTER("create_hj_key_for_table");
do
{
if (!(~used_tables & keyuse->used_tables) &&
(first_keyuse || keyuse->keypart != (keyuse-1)->keypart))
key_parts++;
first_keyuse= FALSE;
keyuse++;
} while (keyuse->table == table && keyuse->is_for_hash_join());
if (!key_parts)
DBUG_RETURN(TRUE);
if (!(keyinfo= (KEY *) thd->alloc(sizeof(KEY))) ||
!(key_part_info = (KEY_PART_INFO *) thd->alloc(sizeof(KEY_PART_INFO)*
key_parts)))
DBUG_RETURN(TRUE);
keyinfo->usable_key_parts= keyinfo->key_parts = key_parts;
keyinfo->key_part= key_part_info;
keyinfo->key_length=0;
keyinfo->algorithm= HA_KEY_ALG_UNDEF;
keyinfo->flags= HA_GENERATED_KEY;
keyinfo->name= (char *) "hj_key";
keyinfo->rec_per_key= (ulong*) thd->alloc(sizeof(ulong)*key_parts);
if (!keyinfo->rec_per_key)
DBUG_RETURN(TRUE);
bzero(keyinfo->rec_per_key, sizeof(ulong)*key_parts);
keyinfo->key_part= key_part_info;
first_keyuse= TRUE;
keyuse= org_keyuse;
do
{
if (!(~used_tables & keyuse->used_tables) &&
(first_keyuse || keyuse->keypart != (keyuse-1)->keypart))
{
Field *field= table->field[keyuse->keypart];
table->create_key_part_by_field(keyinfo, key_part_info, field);
first_keyuse= FALSE;
key_part_info++;
}
keyuse++;
} while (keyuse->table == table && keyuse->is_for_hash_join());
join_tab->hj_key= keyinfo;
DBUG_RETURN(FALSE);
}
static bool create_ref_for_key(JOIN *join, JOIN_TAB *j,
KEYUSE *org_keyuse, table_map used_tables)
{
uint keyparts, length, key;
TABLE *table;
KEY *keyinfo;
KEYUSE *keyuse= org_keyuse;
bool ftkey= (keyuse->keypart == FT_KEYPART);
THD *thd= join->thd;
DBUG_ENTER("create_ref_for_key");
/* Use best key from find_best */
table=j->table;
key=keyuse->key;
keyinfo=table->key_info+key;
table= j->table;
key= keyuse->key;
if (!is_hash_join_key_no(key))
keyinfo= table->key_info+key;
else
{
if (create_hj_key_for_table(join, j, org_keyuse, used_tables))
DBUG_RETURN(TRUE);
keyinfo= j->hj_key;
}
if (ftkey)
{
@ -6272,12 +6490,18 @@ static bool create_ref_for_key(JOIN *join, JOIN_TAB *j, KEYUSE *org_keyuse,
{
if (!(~used_tables & keyuse->used_tables))
{
if (keyparts == keyuse->keypart &&
!(found_part_ref_or_null & keyuse->optimize))
if (is_hash_join_key_no(key) &&
(keyparts == 0 || keyuse->keypart != (keyuse-1)->keypart))
{
length+= keyinfo->key_part[keyparts].store_length;
keyparts++;
}
else if (!is_hash_join_key_no(key) && keyparts == keyuse->keypart &&
!(found_part_ref_or_null & keyuse->optimize))
{
length+= keyinfo->key_part[keyuse->keypart].store_length;
found_part_ref_or_null|= keyuse->optimize;
keyparts++;
}
}
keyuse++;
@ -6285,14 +6509,13 @@ static bool create_ref_for_key(JOIN *join, JOIN_TAB *j, KEYUSE *org_keyuse,
} /* not ftkey */
/* set up fieldref */
keyinfo=table->key_info+key;
j->ref.key_parts=keyparts;
j->ref.key_length=length;
j->ref.key=(int) key;
j->ref.key_parts= keyparts;
j->ref.key_length= length;
j->ref.key= (int) key;
if (!(j->ref.key_buff= (uchar*) thd->calloc(ALIGN_SIZE(length)*2)) ||
!(j->ref.key_copy= (store_key**) thd->alloc((sizeof(store_key*) *
(keyparts+1)))) ||
!(j->ref.items= (Item**) thd->alloc(sizeof(Item*)*keyparts)) ||
(keyparts+1)))) ||
!(j->ref.items=(Item**) thd->alloc(sizeof(Item*)*keyparts)) ||
!(j->ref.cond_guards= (bool**) thd->alloc(sizeof(uint*)*keyparts)))
{
DBUG_RETURN(TRUE);
@ -6322,9 +6545,11 @@ static bool create_ref_for_key(JOIN *join, JOIN_TAB *j, KEYUSE *org_keyuse,
uint i;
for (i=0 ; i < keyparts ; keyuse++,i++)
{
while (keyuse->keypart != i ||
((~used_tables) & keyuse->used_tables))
keyuse++; /* Skip other parts */
while (((~used_tables) & keyuse->used_tables) ||
(keyuse->keypart !=
(is_hash_join_key_no(key) ?
keyinfo->key_part[i].field->field_index : i)))
keyuse++; /* Skip other parts */
uint maybe_null= test(keyinfo->key_part[i].null_bit);
j->ref.items[i]=keyuse->val; // Save for cond removal
@ -6335,10 +6560,12 @@ static bool create_ref_for_key(JOIN *join, JOIN_TAB *j, KEYUSE *org_keyuse,
if (!keyuse->used_tables &&
!(join->select_options & SELECT_DESCRIBE))
{ // Compare against constant
store_key_item tmp(thd, keyinfo->key_part[i].field,
store_key_item tmp(thd,
keyinfo->key_part[i].field,
key_buff + maybe_null,
maybe_null ? key_buff : 0,
keyinfo->key_part[i].length, keyuse->val,
keyinfo->key_part[i].length,
keyuse->val,
FALSE);
if (thd->is_fatal_error)
DBUG_RETURN(TRUE);
@ -6356,7 +6583,7 @@ static bool create_ref_for_key(JOIN *join, JOIN_TAB *j, KEYUSE *org_keyuse,
*/
if ((keyuse->optimize & KEY_OPTIMIZE_REF_OR_NULL) && maybe_null)
null_ref_key= key_buff;
key_buff+=keyinfo->key_part[i].store_length;
key_buff+= keyinfo->key_part[i].store_length;
}
} /* not ftkey */
*ref_key=0; // end_marker
@ -7331,6 +7558,12 @@ void set_join_cache_denial(JOIN_TAB *join_tab)
don't do join buffering for the first table in sjm nest.
*/
join_tab[-1].next_select= sub_select;
if (join_tab->type == JT_REF && join_tab->is_ref_for_hash_join())
{
join_tab->type= JT_ALL;
join_tab->ref.key_parts= 0;
join_tab->join->return_tab= join_tab;
}
}
}
@ -7649,15 +7882,17 @@ uint check_join_cache_usage(JOIN_TAB *tab,
ha_rows rows;
uint bufsz= 4096;
JOIN_CACHE *prev_cache=0;
uint cache_level= join->thd->variables.join_cache_level;
uint cache_level= join->max_allowed_join_cache_level;
bool force_unlinked_cache=
!optimizer_flag(join->thd, OPTIMIZER_SWITCH_JOIN_CACHE_INCREMENTAL);
!(join->allowed_join_cache_types & JOIN_CACHE_INCREMENTAL_BIT);
bool no_hashed_cache=
!optimizer_flag(join->thd, OPTIMIZER_SWITCH_JOIN_CACHE_HASHED);
!(join->allowed_join_cache_types & JOIN_CACHE_HASHED_BIT);
bool no_bka_cache=
!optimizer_flag(join->thd, OPTIMIZER_SWITCH_JOIN_CACHE_BKA);
!(join->allowed_join_cache_types & JOIN_CACHE_BKA_BIT);
uint i= tab - join->join_tab;
join->return_tab= 0;
*icp_other_tables_ok= TRUE;
*idx_cond_fact_out= TRUE;
if (cache_level == 0 || i == join->const_tables || !prev_tab)
@ -7676,10 +7911,10 @@ uint check_join_cache_usage(JOIN_TAB *tab,
goto no_join_cache;
if (tab->is_inner_table_of_semi_join_with_first_match() &&
!optimizer_flag(join->thd, OPTIMIZER_SWITCH_SEMIJOIN_WITH_CACHE))
!join->allowed_semijoin_with_cache)
goto no_join_cache;
if (tab->is_inner_table_of_outer_join() &&
!optimizer_flag(join->thd, OPTIMIZER_SWITCH_OUTER_JOIN_WITH_CACHE))
!join->allowed_outer_join_with_cache)
goto no_join_cache;
/*
@ -7731,8 +7966,7 @@ uint check_join_cache_usage(JOIN_TAB *tab,
goto no_join_cache;
}
if (!force_unlinked_cache)
prev_cache= prev_tab->cache;
prev_cache= prev_tab->cache;
switch (tab->type) {
case JT_ALL:
@ -7751,25 +7985,25 @@ uint check_join_cache_usage(JOIN_TAB *tab,
case JT_EQ_REF:
if (cache_level <=2 || (no_hashed_cache && no_bka_cache))
goto no_join_cache;
flags= HA_MRR_NO_NULL_ENDPOINTS | HA_MRR_SINGLE_POINT;
if (tab->table->covering_keys.is_set(tab->ref.key))
flags|= HA_MRR_INDEX_ONLY;
rows= tab->table->file->multi_range_read_info(tab->ref.key, 10, 20,
tab->ref.key_parts,
&bufsz, &flags, &cost);
if (!tab->is_ref_for_hash_join())
{
flags= HA_MRR_NO_NULL_ENDPOINTS | HA_MRR_SINGLE_POINT;
if (tab->table->covering_keys.is_set(tab->ref.key))
flags|= HA_MRR_INDEX_ONLY;
rows= tab->table->file->multi_range_read_info(tab->ref.key, 10, 20,
tab->ref.key_parts,
&bufsz, &flags, &cost);
}
if ((cache_level <=4 && !no_hashed_cache) || no_bka_cache ||
((flags & HA_MRR_NO_ASSOCIATION) && cache_level <=6))
((flags & HA_MRR_NO_ASSOCIATION) && cache_level <=6) ||
tab->is_ref_for_hash_join())
{
if (!tab->hash_join_is_possible() ||
tab->make_scan_filter())
goto no_join_cache;
if (cache_level == 3)
{
if (prev_tab->cache)
goto no_join_cache;
prev_cache= 0;
}
if ((tab->cache= new JOIN_CACHE_BNLH(join, tab, prev_cache)) &&
((options & SELECT_DESCRIBE) || !tab->cache->init()))
{
@ -7814,6 +8048,8 @@ uint check_join_cache_usage(JOIN_TAB *tab,
}
no_join_cache:
if (tab->type != JT_ALL && tab->is_ref_for_hash_join())
tab->type= JT_ALL;
revise_cache_usage(tab);
return 0;
}
@ -7845,12 +8081,16 @@ static bool
make_join_readinfo(JOIN *join, ulonglong options, uint no_jbuf_after)
{
uint i;
DBUG_ENTER("make_join_readinfo");
restart:
uint jcl= 0;
bool statistics= test(!(join->select_options & SELECT_DESCRIBE));
bool sorted= 1;
uint first_sjm_table= MAX_TABLES;
uint last_sjm_table= MAX_TABLES;
DBUG_ENTER("make_join_readinfo");
if (!join->select_lex->sj_nests.is_empty() &&
@ -7947,6 +8187,9 @@ make_join_readinfo(JOIN *join, ulonglong options, uint no_jbuf_after)
break;
}
if (join->return_tab)
goto restart;
switch (tab->type) {
case JT_SYSTEM: // Only happens with left join
case JT_CONST: // Only happens with left join
@ -7959,7 +8202,7 @@ make_join_readinfo(JOIN *join, ulonglong options, uint no_jbuf_after)
table->key_read=1;
table->file->extra(HA_EXTRA_KEYREAD);
}
else if (!jcl || jcl > 4)
else if ((!jcl || jcl > 4) && !tab->is_ref_for_hash_join())
push_index_cond(tab, tab->ref.key,
icp_other_tables_ok, idx_cond_fact_out);
break;
@ -7972,7 +8215,7 @@ make_join_readinfo(JOIN *join, ulonglong options, uint no_jbuf_after)
table->key_read=1;
table->file->extra(HA_EXTRA_KEYREAD);
}
else if (!jcl || jcl > 4)
else if ((!jcl || jcl > 4) && !tab->is_ref_for_hash_join())
push_index_cond(tab, tab->ref.key,
icp_other_tables_ok, idx_cond_fact_out);
break;
@ -7988,7 +8231,7 @@ make_join_readinfo(JOIN *join, ulonglong options, uint no_jbuf_after)
if (table->covering_keys.is_set(tab->ref.key) &&
!table->no_keyread)
table->enable_keyread();
else if (!jcl || jcl > 4)
else if ((!jcl || jcl > 4) &&!tab->is_ref_for_hash_join())
push_index_cond(tab, tab->ref.key,
icp_other_tables_ok, idx_cond_fact_out);
break;
@ -9894,7 +10137,7 @@ static void update_const_equal_items(COND *cond, JOIN_TAB *tab)
TABLE *tab= field->table;
KEYUSE *use;
for (use= stat->keyuse; use && use->table == tab; use++)
if (possible_keys.is_set(use->key) &&
if (!use->is_for_hash_join() && possible_keys.is_set(use->key) &&
tab->key_info[use->key].key_part[use->keypart].field ==
field)
tab->const_key_parts[use->key]|= use->keypart_map;
@ -11435,7 +11678,9 @@ void setup_tmp_table_column_bitmaps(TABLE *table, uchar *bitmaps)
bitmap_init(&table->tmp_set,
(my_bitmap_map*) (bitmaps+ 2*bitmap_buffer_size(field_count)),
field_count, FALSE);
bitmap_init(&table->eq_join_set,
(my_bitmap_map*) (bitmaps+ 3*bitmap_buffer_size(field_count)),
field_count, FALSE);
/* write_set and all_set are copies of read_set */
table->def_write_set= table->def_read_set;
table->s->all_set= table->def_read_set;
@ -11589,7 +11834,7 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
&tmpname, (uint) strlen(tmp_table_name)+1,
&group_buff, (group && ! using_unique_constraint ?
param->group_length : 0),
&bitmaps, bitmap_buffer_size(field_count)*3,
&bitmaps, bitmap_buffer_size(field_count)*4,
NullS))
{
if (temp_pool_slot != MY_BIT_NONE)
@ -12248,7 +12493,7 @@ TABLE *create_virtual_tmp_table(THD *thd, List<Create_field> &field_list)
&share, sizeof(*share),
&field, (field_count + 1) * sizeof(Field*),
&blob_field, (field_count+1) *sizeof(uint),
&bitmaps, bitmap_buffer_size(field_count)*3,
&bitmaps, bitmap_buffer_size(field_count)*4,
NullS))
return 0;
@ -14899,6 +15144,7 @@ bool test_if_ref(Item *root_cond, Item_field *left_item,Item *right_item)
JOIN_TAB *join_tab= field->table->reginfo.join_tab;
// No need to change const test
if (!field->table->const_table && join_tab &&
!join_tab->is_ref_for_hash_join() &&
(!join_tab->first_inner ||
*join_tab->first_inner->on_expr_ref == root_cond))
{
@ -15215,19 +15461,22 @@ make_cond_after_sjm(Item *root_cond, Item *cond, table_map tables,
static Item *
part_of_refkey(TABLE *table,Field *field)
{
if (!table->reginfo.join_tab)
JOIN_TAB *join_tab= table->reginfo.join_tab;
if (!join_tab)
return (Item*) 0; // field from outer non-select (UPDATE,...)
uint ref_parts=table->reginfo.join_tab->ref.key_parts;
uint ref_parts= join_tab->ref.key_parts;
if (ref_parts)
{
KEY_PART_INFO *key_part=
table->key_info[table->reginfo.join_tab->ref.key].key_part;
uint key= join_tab->ref.key;
KEY *key_info= join_tab->get_keyinfo_by_key_no(key);
KEY_PART_INFO *key_part= key_info->key_part;
for (uint part=0 ; part < ref_parts ; part++,key_part++)
if (field->eq(key_part->field) &&
!(key_part->key_part_flag & (HA_PART_KEY_SEG | HA_NULL_PART)))
return table->reginfo.join_tab->ref.items[part];
return join_tab->ref.items[part];
}
return (Item*) 0;
}
@ -18795,6 +19044,9 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
tab->type = JT_RANGE;
}
if (tab->cache && tab->cache->get_join_alg() == JOIN_CACHE::BNLH_JOIN_ALG)
tab->type= JT_HASH;
/* table */
if (table->derived_select_number)
{
@ -18858,7 +19110,7 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
/* Build "key", "key_len", and "ref" values and add them to item_list */
if (tab->ref.key_parts)
{
KEY *key_info=table->key_info+ tab->ref.key;
KEY *key_info= tab->get_keyinfo_by_key_no(tab->ref.key);
register uint length;
item_list.push_back(new Item_string(key_info->name,
strlen(key_info->name),
@ -18942,7 +19194,8 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
ha_rows examined_rows;
if (tab->select && tab->select->quick)
examined_rows= tab->select->quick->records;
else if (tab->type == JT_NEXT || tab->type == JT_ALL)
else if (tab->type == JT_NEXT || tab->type == JT_ALL ||
tab->type == JT_HASH)
{
if (tab->limit)
examined_rows= tab->limit;
@ -19683,6 +19936,40 @@ bool JOIN::change_result(select_result *res)
DBUG_RETURN(FALSE);
}
/**
@brief
Set allowed types of join caches that can be used for join operations
@details
The function sets a bitmap of allowed join buffers types in the field
allowed_join_cache_types of this JOIN structure:
bit 1 is set if tjoin buffers are allowed to be incremental
bit 2 is set if the join buffers are allowed to be hashed
but 3 is set if the join buffers are allowed to be used for BKA
join algorithms.
The allowed types are read from system variables.
Besides the function sets maximum allowed join cache level that is
also read from a system variable.
*/
void JOIN::set_allowed_join_cache_types()
{
allowed_join_cache_types= 0;
if (optimizer_flag(thd, OPTIMIZER_SWITCH_JOIN_CACHE_INCREMENTAL))
allowed_join_cache_types|= JOIN_CACHE_INCREMENTAL_BIT;
if (optimizer_flag(thd, OPTIMIZER_SWITCH_JOIN_CACHE_HASHED))
allowed_join_cache_types|= JOIN_CACHE_HASHED_BIT;
if (optimizer_flag(thd, OPTIMIZER_SWITCH_JOIN_CACHE_BKA))
allowed_join_cache_types|= JOIN_CACHE_BKA_BIT;
allowed_semijoin_with_cache=
optimizer_flag(thd, OPTIMIZER_SWITCH_SEMIJOIN_WITH_CACHE);
allowed_outer_join_with_cache=
optimizer_flag(thd, OPTIMIZER_SWITCH_OUTER_JOIN_WITH_CACHE);
max_allowed_join_cache_level= thd->variables.join_cache_level;
}
/**
@} (end of group Query_Optimizer)
*/

32
sql/sql_select.h
View File

@ -39,6 +39,11 @@
/* Values in optimize */
#define KEY_OPTIMIZE_EXISTS 1
#define KEY_OPTIMIZE_REF_OR_NULL 2
#define KEY_OPTIMIZE_EQ 4
inline uint get_hash_join_key_no() { return MAX_KEY; }
inline bool is_hash_join_key_no(uint key) { return key == MAX_KEY; }
typedef struct keyuse_t {
TABLE *table;
@ -68,6 +73,8 @@ typedef struct keyuse_t {
MAX_UINT Otherwise
*/
uint sj_pred_no;
bool is_for_hash_join() { return is_hash_join_key_no(key); }
} KEYUSE;
class store_key;
@ -127,7 +134,8 @@ typedef struct st_table_ref
*/
enum join_type { JT_UNKNOWN,JT_SYSTEM,JT_CONST,JT_EQ_REF,JT_REF,JT_MAYBE_REF,
JT_ALL, JT_RANGE, JT_NEXT, JT_FT, JT_REF_OR_NULL,
JT_UNIQUE_SUBQUERY, JT_INDEX_SUBQUERY, JT_INDEX_MERGE};
JT_UNIQUE_SUBQUERY, JT_INDEX_SUBQUERY, JT_INDEX_MERGE,
JT_HASH};
class JOIN;
@ -159,6 +167,8 @@ typedef struct st_join_table {
st_join_table() {} /* Remove gcc warning */
TABLE *table;
KEYUSE *keyuse; /**< pointer to first used key */
KEY *hj_key; /**< descriptor of the used best hash join key
not supported by any index */
SQL_SELECT *select;
COND *select_cond;
COND *on_precond; /**< part of on condition to check before
@ -408,6 +418,11 @@ typedef struct st_join_table {
double get_partial_join_cardinality() { return partial_join_cardinality; }
bool hash_join_is_possible();
int make_scan_filter();
bool is_ref_for_hash_join() { return is_hash_join_key_no(ref.key); }
KEY *get_keyinfo_by_key_no(uint key)
{
return (is_hash_join_key_no(key) ? hj_key : table->key_info+key);
}
} JOIN_TAB;
@ -681,6 +696,15 @@ public:
Item *tmp_having; ///< To store having when processed temporary table
Item *having_history; ///< Store having for explain
ulonglong select_options;
/*
Bitmap of allowed types of the join caches that
can be used for join operations
*/
uint allowed_join_cache_types;
bool allowed_semijoin_with_cache;
bool allowed_outer_join_with_cache;
/* Maximum level of the join caches that can be used for join operations */
uint max_allowed_join_cache_level;
select_result *result;
TMP_TABLE_PARAM tmp_table_param;
MYSQL_LOCK *lock;
@ -947,6 +971,12 @@ public:
bool shrink_join_buffers(JOIN_TAB *jt,
ulonglong curr_space,
ulonglong needed_space);
void set_allowed_join_cache_types();
bool is_allowed_hash_join_access()
{
return test(allowed_join_cache_types & JOIN_CACHE_HASHED_BIT) &&
max_allowed_join_cache_level > JOIN_CACHE_HASHED_BIT;
}
private:
/**

94
sql/table.cc
View File

@ -2344,7 +2344,7 @@ partititon_err:
/* Allocate bitmaps */
bitmap_size= share->column_bitmap_size;
if (!(bitmaps= (uchar*) alloc_root(&outparam->mem_root, bitmap_size*4)))
if (!(bitmaps= (uchar*) alloc_root(&outparam->mem_root, bitmap_size*5)))
goto err;
bitmap_init(&outparam->def_read_set,
(my_bitmap_map*) bitmaps, share->fields, FALSE);
@ -2354,6 +2354,8 @@ partititon_err:
(my_bitmap_map*) (bitmaps+bitmap_size*2), share->fields, FALSE);
bitmap_init(&outparam->tmp_set,
(my_bitmap_map*) (bitmaps+bitmap_size*3), share->fields, FALSE);
bitmap_init(&outparam->eq_join_set,
(my_bitmap_map*) (bitmaps+bitmap_size*4), share->fields, FALSE);
outparam->default_column_bitmaps();
/* The table struct is now initialized; Open the table */
@ -5205,6 +5207,52 @@ bool TABLE::alloc_keys(uint key_count)
}
void TABLE::create_key_part_by_field(KEY *keyinfo,
KEY_PART_INFO *key_part_info,
Field *field)
{
field->flags|= PART_KEY_FLAG;
key_part_info->null_bit= field->null_bit;
key_part_info->null_offset= (uint) (field->null_ptr -
(uchar*) record[0]);
key_part_info->field= field;
key_part_info->offset= field->offset(record[0]);
key_part_info->length= (uint16) field->pack_length();
keyinfo->key_length+= key_part_info->length;
key_part_info->key_part_flag= 0;
/* TODO:
The below method of computing the key format length of the
key part is a copy/paste from opt_range.cc, and table.cc.
This should be factored out, e.g. as a method of Field.
In addition it is not clear if any of the Field::*_length
methods is supposed to compute the same length. If so, it
might be reused.
*/
key_part_info->store_length= key_part_info->length;
if (field->real_maybe_null())
{
key_part_info->store_length+= HA_KEY_NULL_LENGTH;
keyinfo->key_length+= HA_KEY_NULL_LENGTH;
}
if (field->type() == MYSQL_TYPE_BLOB ||
field->real_type() == MYSQL_TYPE_VARCHAR)
{
key_part_info->store_length+= HA_KEY_BLOB_LENGTH;
keyinfo->key_length+= HA_KEY_BLOB_LENGTH; // ???
key_part_info->key_part_flag|=
field->type() == MYSQL_TYPE_BLOB ? HA_BLOB_PART: HA_VAR_LENGTH_PART;
}
key_part_info->type= (uint8) field->key_type();
key_part_info->key_type =
((ha_base_keytype) key_part_info->type == HA_KEYTYPE_TEXT ||
(ha_base_keytype) key_part_info->type == HA_KEYTYPE_VARTEXT1 ||
(ha_base_keytype) key_part_info->type == HA_KEYTYPE_VARTEXT2) ?
0 : FIELDFLAG_BINARY;
}
/**
Add a key to a temporary table
@ -5255,54 +5303,18 @@ bool TABLE::add_tmp_key(uint key, uint key_parts,
if (!keyinfo->rec_per_key)
return TRUE;
bzero(keyinfo->rec_per_key, sizeof(ulong)*key_parts);
for (i= 0; i < key_parts; i++)
{
reg_field= field + next_field_no(arg);
if (key_start)
(*reg_field)->key_start.set_bit(key);
(*reg_field)->part_of_key.set_bit(key);
create_key_part_by_field(keyinfo, key_part_info, *reg_field);
key_start= FALSE;
(*reg_field)->part_of_key.set_bit(key);
(*reg_field)->flags|= PART_KEY_FLAG;
key_part_info->null_bit= (*reg_field)->null_bit;
key_part_info->null_offset= (uint) ((*reg_field)->null_ptr -
(uchar*) record[0]);
key_part_info->field= *reg_field;
key_part_info->offset= (*reg_field)->offset(record[0]);
key_part_info->length= (uint16) (*reg_field)->pack_length();
keyinfo->key_length+= key_part_info->length;
key_part_info->key_part_flag= 0;
/* TODO:
The below method of computing the key format length of the
key part is a copy/paste from opt_range.cc, and table.cc.
This should be factored out, e.g. as a method of Field.
In addition it is not clear if any of the Field::*_length
methods is supposed to compute the same length. If so, it
might be reused.
*/
key_part_info->store_length= key_part_info->length;
if ((*reg_field)->real_maybe_null())
{
key_part_info->store_length+= HA_KEY_NULL_LENGTH;
keyinfo->key_length+= HA_KEY_NULL_LENGTH;
if (unique)
keyinfo->flags|= HA_NULL_ARE_EQUAL; // def. that NULL == NULL
}
if ((*reg_field)->type() == MYSQL_TYPE_BLOB ||
(*reg_field)->real_type() == MYSQL_TYPE_VARCHAR)
{
key_part_info->store_length+= HA_KEY_BLOB_LENGTH;
keyinfo->key_length+= HA_KEY_BLOB_LENGTH; // ???
}
key_part_info->type= (uint8) (*reg_field)->key_type();
key_part_info->key_type =
((ha_base_keytype) key_part_info->type == HA_KEYTYPE_TEXT ||
(ha_base_keytype) key_part_info->type == HA_KEYTYPE_VARTEXT1 ||
(ha_base_keytype) key_part_info->type == HA_KEYTYPE_VARTEXT2) ?
0 : FIELDFLAG_BINARY;
key_part_info++;
}
set_if_bigger(s->max_key_length, keyinfo->key_length);
s->keys++;
return FALSE;

3
sql/table.h
View File

@ -725,6 +725,7 @@ struct st_table {
uchar *null_flags;
my_bitmap_map *bitmap_init_value;
MY_BITMAP def_read_set, def_write_set, def_vcol_set, tmp_set;
MY_BITMAP eq_join_set; /* used to mark equi-joined fields */
MY_BITMAP *read_set, *write_set, *vcol_set; /* Active column sets */
/*
The ID of the query that opened and is using this table. Has different
@ -955,6 +956,8 @@ struct st_table {
bool add_tmp_key(uint key, uint key_parts,
uint (*next_field_no) (uchar *), uchar *arg,
bool unique);
void create_key_part_by_field(KEY *keyinfo, KEY_PART_INFO *key_part_info,
Field *field);
bool is_children_attached(void);
inline void enable_keyread()
{