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Fixed a flaw in the implementation of condition push-down

Browse Source 
for materialized views and derived tables: there were no
push-down if the view was defined as union of selects
without aggregation. Added test cases with such unions.

Adjusted result files after the merge of the code for mdev-9197.
This commit is contained in:
Igor Babaev
2016-09-04 20:11:58 -07:00
parent 102fc62990
commit 3b40f78ede
13 changed files with 1034 additions and 23 deletions
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550
mysql-test/r/derived_cond_pushdown.result
View File

@ -65,6 +65,18 @@ where t1.b>10 group by a,b having c < 300
union union
select a, b, avg(c) as c from t1 select a, b, avg(c) as c from t1
where t1.c>300 group by a,b having c < 707; where t1.c>300 group by a,b having c < 707;
create view v3_union as
select a, b, (a+1) as c from t1
where t1.a<10
union
select a, b, c from t1
where t1.b>10 and t1.c>100;
create view v4_union as
select a, b, max(c)-100 as c from t1
where t1.a<10 group by a,b having c > 109
union
select a, b, (c+100) as c from t1
where t1.b>10;
create view v_double as create view v_double as
select a, avg(a/4) as avg_a, b, c from t1_double select a, avg(a/4) as avg_a, b, c from t1_double
where (b>12.2) group by b,c having (avg_a<22.333); where (b>12.2) group by b,c having (avg_a<22.333);
@ -5262,6 +5274,540 @@ EXPLAIN
} }
} }
} }
# using derived table with union of selects without aggregation
# extracted conjunctive predicate: pushing in WHERE of both selects
set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v3_union as v,t2 where (v.a=t2.a) and (v.c>6);
a b c a b c d
1 21 123 1 21 909 12
1 21 101 1 21 909 12
1 21 104 1 21 909 12
1 33 988 1 21 909 12
1 19 107 1 21 909 12
1 21 500 1 21 909 12
1 21 345 1 21 909 12
7 11 708 7 13 312 406
7 11 8 7 13 312 406
8 33 404 8 64 248 107
8 33 123 8 64 248 107
8 33 114 8 64 248 107
8 33 9 8 64 248 107
6 20 214 6 20 315 279
6 20 315 6 20 315 279
6 20 309 6 20 315 279
6 20 7 6 20 315 279
1 21 123 1 19 203 107
1 21 101 1 19 203 107
1 21 104 1 19 203 107
1 33 988 1 19 203 107
1 19 107 1 19 203 107
1 21 500 1 19 203 107
1 21 345 1 19 203 107
8 33 404 8 80 800 314
8 33 123 8 80 800 314
8 33 114 8 80 800 314
8 33 9 8 80 800 314
6 20 214 6 23 303 909
6 20 315 6 23 303 909
6 20 309 6 23 303 909
6 20 7 6 23 303 909
select * from v3_union as v,t2 where (v.a=t2.a) and (v.c>6);
a b c a b c d
1 21 123 1 21 909 12
1 21 101 1 21 909 12
1 21 104 1 21 909 12
1 33 988 1 21 909 12
1 19 107 1 21 909 12
1 21 500 1 21 909 12
1 21 345 1 21 909 12
7 11 708 7 13 312 406
7 11 8 7 13 312 406
8 33 404 8 64 248 107
8 33 123 8 64 248 107
8 33 114 8 64 248 107
8 33 9 8 64 248 107
6 20 214 6 20 315 279
6 20 315 6 20 315 279
6 20 309 6 20 315 279
6 20 7 6 20 315 279
1 21 123 1 19 203 107
1 21 101 1 19 203 107
1 21 104 1 19 203 107
1 33 988 1 19 203 107
1 19 107 1 19 203 107
1 21 500 1 19 203 107
1 21 345 1 19 203 107
8 33 404 8 80 800 314
8 33 123 8 80 800 314
8 33 114 8 80 800 314
8 33 9 8 80 800 314
6 20 214 6 23 303 909
6 20 315 6 23 303 909
6 20 309 6 23 303 909
6 20 7 6 23 303 909
explain select * from v3_union as v,t2 where (v.a=t2.a) and (v.c>6);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where
1 PRIMARY <derived2> ref key0 key0 5 test.t2.a 4 Using where
2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where
3 UNION t1 ALL NULL NULL NULL NULL 20 Using where
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
explain format=json select * from v3_union as v,t2 where (v.a=t2.a) and (v.c>6);
EXPLAIN
{
"query_block": {
"select_id": 1,
"table": {
"table_name": "t2",
"access_type": "ALL",
"rows": 9,
"filtered": 100,
"attached_condition": "(t2.a is not null)"
},
"table": {
"table_name": "<derived2>",
"access_type": "ref",
"possible_keys": ["key0"],
"key": "key0",
"key_length": "5",
"used_key_parts": ["a"],
"ref": ["test.t2.a"],
"rows": 4,
"filtered": 100,
"attached_condition": "(v.c > 6)",
"materialized": {
"query_block": {
"union_result": {
"table_name": "<union2,3>",
"access_type": "ALL",
"query_specifications": [
{
"query_block": {
"select_id": 2,
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 20,
"filtered": 100,
"attached_condition": "((t1.a < 10) and ((t1.a + 1) > 6))"
}
}
},
{
"query_block": {
"select_id": 3,
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 20,
"filtered": 100,
"attached_condition": "((t1.b > 10) and (t1.c > 100) and (t1.c > 6))"
}
}
}
]
}
}
}
}
}
}
# using derived table with union of selects without aggregation
# extracted conjunctive OR subformula: pushing in WHERE using equalities
set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v3_union as v,t2 where (v.a=t2.a) and ((t2.a>1) or (v.b<20));
a b c a b c d
1 19 107 1 21 909 12
1 19 2 1 21 909 12
7 11 708 7 13 312 406
7 11 8 7 13 312 406
8 33 404 8 64 248 107
8 33 123 8 64 248 107
8 33 114 8 64 248 107
8 33 9 8 64 248 107
6 20 214 6 20 315 279
6 20 315 6 20 315 279
6 20 309 6 20 315 279
6 20 7 6 20 315 279
1 19 107 1 19 203 107
1 19 2 1 19 203 107
8 33 404 8 80 800 314
8 33 123 8 80 800 314
8 33 114 8 80 800 314
8 33 9 8 80 800 314
6 20 214 6 23 303 909
6 20 315 6 23 303 909
6 20 309 6 23 303 909
6 20 7 6 23 303 909
select * from v3_union as v,t2 where (v.a=t2.a) and ((t2.a>1) or (v.b<20));
a b c a b c d
1 19 107 1 21 909 12
1 19 2 1 21 909 12
7 11 708 7 13 312 406
7 11 8 7 13 312 406
8 33 404 8 64 248 107
8 33 123 8 64 248 107
8 33 114 8 64 248 107
8 33 9 8 64 248 107
6 20 214 6 20 315 279
6 20 315 6 20 315 279
6 20 309 6 20 315 279
6 20 7 6 20 315 279
1 19 107 1 19 203 107
1 19 2 1 19 203 107
8 33 404 8 80 800 314
8 33 123 8 80 800 314
8 33 114 8 80 800 314
8 33 9 8 80 800 314
6 20 214 6 23 303 909
6 20 315 6 23 303 909
6 20 309 6 23 303 909
6 20 7 6 23 303 909
explain select * from v3_union as v,t2 where (v.a=t2.a) and ((t2.a>1) or (v.b<20));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where
1 PRIMARY <derived2> ref key0 key0 5 test.t2.a 4 Using where
2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where
3 UNION t1 ALL NULL NULL NULL NULL 20 Using where
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
explain format=json select * from v3_union as v,t2 where (v.a=t2.a) and ((t2.a>1) or (v.b<20));
EXPLAIN
{
"query_block": {
"select_id": 1,
"table": {
"table_name": "t2",
"access_type": "ALL",
"rows": 9,
"filtered": 100,
"attached_condition": "(t2.a is not null)"
},
"table": {
"table_name": "<derived2>",
"access_type": "ref",
"possible_keys": ["key0"],
"key": "key0",
"key_length": "5",
"used_key_parts": ["a"],
"ref": ["test.t2.a"],
"rows": 4,
"filtered": 100,
"attached_condition": "((t2.a > 1) or (v.b < 20))",
"materialized": {
"query_block": {
"union_result": {
"table_name": "<union2,3>",
"access_type": "ALL",
"query_specifications": [
{
"query_block": {
"select_id": 2,
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 20,
"filtered": 100,
"attached_condition": "((t1.a < 10) and ((t1.a > 1) or (t1.b < 20)))"
}
}
},
{
"query_block": {
"select_id": 3,
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 20,
"filtered": 100,
"attached_condition": "((t1.b > 10) and (t1.c > 100) and ((t1.a > 1) or (t1.b < 20)))"
}
}
}
]
}
}
}
}
}
}
# using derived table with union of selects without aggregation
# extracted the whole condition: in WHERE of both selects
set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v3_union as v,t2 where
(v.a=t2.a) and ((v.b=19) or (v.b=21)) and ((v.c<3) or (v.c>600));
a b c a b c d
1 19 2 1 21 909 12
1 21 2 1 21 909 12
1 19 2 1 19 203 107
1 21 2 1 19 203 107
select * from v3_union as v,t2 where
(v.a=t2.a) and ((v.b=19) or (v.b=21)) and ((v.c<3) or (v.c>600));
a b c a b c d
1 19 2 1 21 909 12
1 21 2 1 21 909 12
1 19 2 1 19 203 107
1 21 2 1 19 203 107
explain select * from v3_union as v,t2 where
(v.a=t2.a) and ((v.b=19) or (v.b=21)) and ((v.c<3) or (v.c>600));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where
1 PRIMARY <derived2> ref key0 key0 5 test.t2.a 4 Using where
2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where
3 UNION t1 ALL NULL NULL NULL NULL 20 Using where
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
explain format=json select * from v3_union as v,t2 where
(v.a=t2.a) and ((v.b=19) or (v.b=21)) and ((v.c<3) or (v.c>600));
EXPLAIN
{
"query_block": {
"select_id": 1,
"table": {
"table_name": "t2",
"access_type": "ALL",
"rows": 9,
"filtered": 100,
"attached_condition": "(t2.a is not null)"
},
"table": {
"table_name": "<derived2>",
"access_type": "ref",
"possible_keys": ["key0"],
"key": "key0",
"key_length": "5",
"used_key_parts": ["a"],
"ref": ["test.t2.a"],
"rows": 4,
"filtered": 100,
"attached_condition": "(((v.b = 19) or (v.b = 21)) and ((v.c < 3) or (v.c > 600)))",
"materialized": {
"query_block": {
"union_result": {
"table_name": "<union2,3>",
"access_type": "ALL",
"query_specifications": [
{
"query_block": {
"select_id": 2,
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 20,
"filtered": 100,
"attached_condition": "((t1.a < 10) and ((t1.b = 19) or (t1.b = 21)) and (((t1.a + 1) < 3) or ((t1.a + 1) > 600)))"
}
}
},
{
"query_block": {
"select_id": 3,
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 20,
"filtered": 100,
"attached_condition": "((t1.b > 10) and (t1.c > 100) and ((t1.b = 19) or (t1.b = 21)) and ((t1.c < 3) or (t1.c > 600)))"
}
}
}
]
}
}
}
}
}
}
# using derived table with union of
# a select without aggregation and a select with aggregation
# extracted conjunctive predicate: pushing in WHERE of both selects
set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v4_union as v,t2 where (v.a=t2.a) and (v.b<20);
a b c a b c d
1 19 207 1 21 909 12
7 11 808 7 13 312 406
7 11 608 7 13 312 406
1 19 207 1 19 203 107
select * from v4_union as v,t2 where (v.a=t2.a) and (v.b<20);
a b c a b c d
1 19 207 1 21 909 12
7 11 808 7 13 312 406
7 11 608 7 13 312 406
1 19 207 1 19 203 107
explain select * from v4_union as v,t2 where (v.a=t2.a) and (v.b<20);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where
1 PRIMARY <derived2> ref key0 key0 5 test.t2.a 4 Using where
2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort
3 UNION t1 ALL NULL NULL NULL NULL 20 Using where
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
explain format=json select * from v4_union as v,t2 where (v.a=t2.a) and (v.b<20);
EXPLAIN
{
"query_block": {
"select_id": 1,
"table": {
"table_name": "t2",
"access_type": "ALL",
"rows": 9,
"filtered": 100,
"attached_condition": "(t2.a is not null)"
},
"table": {
"table_name": "<derived2>",
"access_type": "ref",
"possible_keys": ["key0"],
"key": "key0",
"key_length": "5",
"used_key_parts": ["a"],
"ref": ["test.t2.a"],
"rows": 4,
"filtered": 100,
"attached_condition": "(v.b < 20)",
"materialized": {
"query_block": {
"union_result": {
"table_name": "<union2,3>",
"access_type": "ALL",
"query_specifications": [
{
"query_block": {
"select_id": 2,
"having_condition": "(c > 109)",
"filesort": {
"sort_key": "t1.a, t1.b",
"temporary_table": {
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 20,
"filtered": 100,
"attached_condition": "((t1.a < 10) and (t1.b < 20))"
}
}
}
}
},
{
"query_block": {
"select_id": 3,
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 20,
"filtered": 100,
"attached_condition": "((t1.b > 10) and (t1.b < 20))"
}
}
}
]
}
}
}
}
}
}
# using derived table with union of
# a select without aggregation and a select with aggregation
# extracted subformula: pushing in WHERE of one select
# extracted subformula: pushing in HAVING of the other select
# extracted sub-subformula: pushing in WHERE of the other select
# using an equality in all pushdowns
set statement optimizer_switch='condition_pushdown_for_derived=off' for select * from v4_union as v,t2 where
(v.a=t2.a) and ((t2.a<3) or (v.b<40)) and (v.c>500);
a b c a b c d
1 33 1088 1 21 909 12
1 21 600 1 21 909 12
1 33 888 1 21 909 12
7 11 808 7 13 312 406
7 11 608 7 13 312 406
8 33 504 8 64 248 107
1 33 1088 1 19 203 107
1 21 600 1 19 203 107
1 33 888 1 19 203 107
8 33 504 8 80 800 314
select * from v4_union as v,t2 where
(v.a=t2.a) and ((t2.a<3) or (v.b<40)) and (v.c>500);
a b c a b c d
1 33 1088 1 21 909 12
1 21 600 1 21 909 12
1 33 888 1 21 909 12
7 11 808 7 13 312 406
7 11 608 7 13 312 406
8 33 504 8 64 248 107
1 33 1088 1 19 203 107
1 21 600 1 19 203 107
1 33 888 1 19 203 107
8 33 504 8 80 800 314
explain select * from v4_union as v,t2 where
(v.a=t2.a) and ((t2.a<3) or (v.b<40)) and (v.c>500);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 9 Using where
1 PRIMARY <derived2> ref key0 key0 5 test.t2.a 4 Using where
2 DERIVED t1 ALL NULL NULL NULL NULL 20 Using where; Using temporary; Using filesort
3 UNION t1 ALL NULL NULL NULL NULL 20 Using where
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
explain format=json select * from v4_union as v,t2 where
(v.a=t2.a) and ((t2.a<3) or (v.b<40)) and (v.c>500);
EXPLAIN
{
"query_block": {
"select_id": 1,
"table": {
"table_name": "t2",
"access_type": "ALL",
"rows": 9,
"filtered": 100,
"attached_condition": "(t2.a is not null)"
},
"table": {
"table_name": "<derived2>",
"access_type": "ref",
"possible_keys": ["key0"],
"key": "key0",
"key_length": "5",
"used_key_parts": ["a"],
"ref": ["test.t2.a"],
"rows": 4,
"filtered": 100,
"attached_condition": "(((t2.a < 3) or (v.b < 40)) and (v.c > 500))",
"materialized": {
"query_block": {
"union_result": {
"table_name": "<union2,3>",
"access_type": "ALL",
"query_specifications": [
{
"query_block": {
"select_id": 2,
"having_condition": "((c > 109) and (c > 500))",
"filesort": {
"sort_key": "t1.a, t1.b",
"temporary_table": {
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 20,
"filtered": 100,
"attached_condition": "((t1.a < 10) and ((t1.a < 3) or (t1.b < 40)))"
}
}
}
}
},
{
"query_block": {
"select_id": 3,
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 20,
"filtered": 100,
"attached_condition": "((t1.b > 10) and ((t1.a < 3) or (t1.b < 40)) and ((t1.c + 100) > 500))"
}
}
}
]
}
}
}
}
}
}
# using embedded derived table : pushing the same conditions # using embedded derived table : pushing the same conditions
# using several derived tables : pushing in all tables # using several derived tables : pushing in all tables
# conjunctive subformula : pushing into WHERE # conjunctive subformula : pushing into WHERE
@ -6432,5 +6978,7 @@ EXPLAIN
} }
} }
} }
drop view v1,v2,v3,v4,v_union,v2_union,v_double,v_char,v_decimal; drop view v1,v2,v3,v4;
drop view v_union,v2_union,v3_union,v4_union;
drop view v_double,v_char,v_decimal;
drop table t1,t2,t1_double,t2_double,t1_char,t2_char,t1_decimal,t2_decimal; drop table t1,t2,t1_double,t2_double,t1_char,t2_char,t1_decimal,t2_decimal;

299
mysql-test/r/derived_view.result
View File

@ -363,9 +363,51 @@ explain extended select * from v1 join v4 on f1=f2;
id select_type table type possible_keys key key_len ref rows filtered Extra id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 11 100.00 Using where 1 PRIMARY t2 ALL NULL NULL NULL NULL 11 100.00 Using where
1 PRIMARY <derived2> ref key0 key0 5 test.t2.f2 2 100.00 1 PRIMARY <derived2> ref key0 key0 5 test.t2.f2 2 100.00
2 DERIVED t1 ALL NULL NULL NULL NULL 11 100.00 Using temporary; Using filesort 2 DERIVED t1 ALL NULL NULL NULL NULL 11 100.00 Using where; Using temporary; Using filesort
Warnings: Warnings:
Note 1003 select `v1`.`f1` AS `f1`,`v1`.`f11` AS `f11`,`test`.`t2`.`f2` AS `f2`,`test`.`t2`.`f22` AS `f22` from `test`.`v1` join `test`.`t2` where ((`v1`.`f1` = `test`.`t2`.`f2`) and (`test`.`t2`.`f2` in (2,3))) Note 1003 select `v1`.`f1` AS `f1`,`v1`.`f11` AS `f11`,`test`.`t2`.`f2` AS `f2`,`test`.`t2`.`f22` AS `f22` from `test`.`v1` join `test`.`t2` where ((`v1`.`f1` = `test`.`t2`.`f2`) and (`test`.`t2`.`f2` in (2,3)))
explain format=json select * from v1 join v4 on f1=f2;
EXPLAIN
{
"query_block": {
"select_id": 1,
"table": {
"table_name": "t2",
"access_type": "ALL",
"rows": 11,
"filtered": 100,
"attached_condition": "((t2.f2 in (2,3)) and (t2.f2 is not null))"
},
"table": {
"table_name": "<derived2>",
"access_type": "ref",
"possible_keys": ["key0"],
"key": "key0",
"key_length": "5",
"used_key_parts": ["f1"],
"ref": ["test.t2.f2"],
"rows": 2,
"filtered": 100,
"materialized": {
"query_block": {
"select_id": 2,
"filesort": {
"sort_key": "t1.f1",
"temporary_table": {
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 11,
"filtered": 100,
"attached_condition": "(t1.f1 in (2,3))"
}
}
}
}
}
}
}
}
select * from v1 join v4 on f1=f2; select * from v1 join v4 on f1=f2;
f1 f11 f2 f22 f1 f11 f2 f22
3 3 3 3 3 3 3 3
@ -389,7 +431,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <derived3> ALL NULL NULL NULL NULL 11 100.00 Using where 1 PRIMARY <derived3> ALL NULL NULL NULL NULL 11 100.00 Using where
3 DERIVED t1 ALL NULL NULL NULL NULL 11 100.00 Using where; Using temporary; Using filesort 3 DERIVED t1 ALL NULL NULL NULL NULL 11 100.00 Using where; Using temporary; Using filesort
Warnings: Warnings:
Note 1003 select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where (`test`.`t1`.`f1` < 7) group by `test`.`t1`.`f1`) `tt` where (`tt`.`f1` > 2) Note 1003 select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where ((`test`.`t1`.`f1` < 7) and (`test`.`t1`.`f1` > 2)) group by `test`.`t1`.`f1`) `tt` where (`tt`.`f1` > 2)
select * from (select * from select * from (select * from
(select * from t1 where f1 < 7 group by f1) tt where f1 > 2) zz; (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) zz;
f1 f11 f1 f11
@ -416,13 +458,63 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
2 DERIVED <derived3> ALL NULL NULL NULL NULL 11 100.00 Using where; Using temporary; Using filesort 2 DERIVED <derived3> ALL NULL NULL NULL NULL 11 100.00 Using where; Using temporary; Using filesort
3 DERIVED t1 ALL NULL NULL NULL NULL 11 100.00 Using where; Using temporary; Using filesort 3 DERIVED t1 ALL NULL NULL NULL NULL 11 100.00 Using where; Using temporary; Using filesort
Warnings: Warnings:
Note 1003 select `zz`.`f1` AS `f1`,`zz`.`f11` AS `f11` from (select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where (`test`.`t1`.`f1` < 7) group by `test`.`t1`.`f1`) `tt` where (`tt`.`f1` > 2) group by `tt`.`f1`) `zz` Note 1003 select `zz`.`f1` AS `f1`,`zz`.`f11` AS `f11` from (select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where ((`test`.`t1`.`f1` < 7) and (`test`.`t1`.`f1` > 2)) group by `test`.`t1`.`f1`) `tt` where (`tt`.`f1` > 2) group by `tt`.`f1`) `zz`
explain format=json select * from (select * from
(select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) zz;
EXPLAIN
{
"query_block": {
"select_id": 1,
"table": {
"table_name": "<derived2>",
"access_type": "ALL",
"rows": 11,
"filtered": 100,
"materialized": {
"query_block": {
"select_id": 2,
"filesort": {
"sort_key": "tt.f1",
"temporary_table": {
"table": {
"table_name": "<derived3>",
"access_type": "ALL",
"rows": 11,
"filtered": 100,
"attached_condition": "(tt.f1 > 2)",
"materialized": {
"query_block": {
"select_id": 3,
"filesort": {
"sort_key": "t1.f1",
"temporary_table": {
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 11,
"filtered": 100,
"attached_condition": "((t1.f1 < 7) and (t1.f1 > 2))"
}
}
}
}
}
}
}
}
}
}
}
}
}
select * from (select * from select * from (select * from
(select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) zz; (select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) zz;
f1 f11 f1 f11
3 3 3 3
5 5 5 5
mat in merged derived join mat in merged derived mat in merged derived join mat in merged derived
set @save_optimizer_switch=@@optimizer_switch;
set optimizer_switch='condition_pushdown_for_derived=off';
explain extended select * from explain extended select * from
(select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) x (select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) x
join join
@ -435,6 +527,69 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
3 DERIVED t1 ALL NULL NULL NULL NULL 11 100.00 Using where; Using temporary; Using filesort 3 DERIVED t1 ALL NULL NULL NULL NULL 11 100.00 Using where; Using temporary; Using filesort
Warnings: Warnings:
Note 1003 select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11`,`tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where (`test`.`t1`.`f1` < 7) group by `test`.`t1`.`f1`) `tt` join (select `t1`.`f1` AS `f1`,`t1`.`f11` AS `f11` from `test`.`t1` where (`t1`.`f1` < 7) group by `t1`.`f1`) `tt` where ((`tt`.`f1` = `tt`.`f1`) and (`tt`.`f1` > 2) and (`tt`.`f1` > 2)) Note 1003 select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11`,`tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where (`test`.`t1`.`f1` < 7) group by `test`.`t1`.`f1`) `tt` join (select `t1`.`f1` AS `f1`,`t1`.`f11` AS `f11` from `test`.`t1` where (`t1`.`f1` < 7) group by `t1`.`f1`) `tt` where ((`tt`.`f1` = `tt`.`f1`) and (`tt`.`f1` > 2) and (`tt`.`f1` > 2))
explain format=json select * from
(select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) x
join
(select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) z
on x.f1 = z.f1;
EXPLAIN
{
"query_block": {
"select_id": 1,
"table": {
"table_name": "<derived3>",
"access_type": "ALL",
"rows": 11,
"filtered": 100,
"attached_condition": "((tt.f1 > 2) and (tt.f1 > 2) and (tt.f1 is not null))",
"materialized": {
"query_block": {
"select_id": 3,
"filesort": {
"sort_key": "t1.f1",
"temporary_table": {
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 11,
"filtered": 100,
"attached_condition": "(t1.f1 < 7)"
}
}
}
}
}
},
"table": {
"table_name": "<derived5>",
"access_type": "ref",
"possible_keys": ["key0"],
"key": "key0",
"key_length": "5",
"used_key_parts": ["f1"],
"ref": ["tt.f1"],
"rows": 2,
"filtered": 100,
"materialized": {
"query_block": {
"select_id": 5,
"filesort": {
"sort_key": "t1.f1",
"temporary_table": {
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 11,
"filtered": 100,
"attached_condition": "(t1.f1 < 7)"
}
}
}
}
}
}
}
}
flush status; flush status;
select * from select * from
(select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) x (select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) x
@ -455,6 +610,7 @@ Handler_read_rnd 8
Handler_read_rnd_deleted 0 Handler_read_rnd_deleted 0
Handler_read_rnd_next 39 Handler_read_rnd_next 39
flush status; flush status;
set optimizer_switch=@save_optimizer_switch;
merged in merged derived join merged in merged derived merged in merged derived join merged in merged derived
explain extended select * from explain extended select * from
(select * from (select * from
@ -495,7 +651,106 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
2 DERIVED <derived3> ALL NULL NULL NULL NULL 11 100.00 Using where; Using temporary; Using filesort 2 DERIVED <derived3> ALL NULL NULL NULL NULL 11 100.00 Using where; Using temporary; Using filesort
3 DERIVED t1 ALL NULL NULL NULL NULL 11 100.00 Using where; Using temporary; Using filesort 3 DERIVED t1 ALL NULL NULL NULL NULL 11 100.00 Using where; Using temporary; Using filesort
Warnings: Warnings:
Note 1003 select `x`.`f1` AS `f1`,`x`.`f11` AS `f11`,`z`.`f1` AS `f1`,`z`.`f11` AS `f11` from (select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where (`test`.`t1`.`f1` < 7) group by `test`.`t1`.`f1`) `tt` where (`tt`.`f1` > 2) group by `tt`.`f1`) `x` join (select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (select `t1`.`f1` AS `f1`,`t1`.`f11` AS `f11` from `test`.`t1` where (`t1`.`f1` < 7) group by `t1`.`f1`) `tt` where (`tt`.`f1` > 2) group by `tt`.`f1`) `z` where (`z`.`f1` = `x`.`f1`) Note 1003 select `x`.`f1` AS `f1`,`x`.`f11` AS `f11`,`z`.`f1` AS `f1`,`z`.`f11` AS `f11` from (select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f11` AS `f11` from `test`.`t1` where ((`test`.`t1`.`f1` < 7) and (`test`.`t1`.`f1` > 2)) group by `test`.`t1`.`f1`) `tt` where (`tt`.`f1` > 2) group by `tt`.`f1`) `x` join (select `tt`.`f1` AS `f1`,`tt`.`f11` AS `f11` from (select `t1`.`f1` AS `f1`,`t1`.`f11` AS `f11` from `test`.`t1` where ((`t1`.`f1` < 7) and (`t1`.`f1` > 2)) group by `t1`.`f1`) `tt` where (`tt`.`f1` > 2) group by `tt`.`f1`) `z` where (`z`.`f1` = `x`.`f1`)
explain format=json select * from
(select * from
(select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) x
join
(select * from
(select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) z
on x.f1 = z.f1;
EXPLAIN
{
"query_block": {
"select_id": 1,
"table": {
"table_name": "<derived2>",
"access_type": "ALL",
"rows": 11,
"filtered": 100,
"attached_condition": "(x.f1 is not null)",
"materialized": {
"query_block": {
"select_id": 2,
"filesort": {
"sort_key": "tt.f1",
"temporary_table": {
"table": {
"table_name": "<derived3>",
"access_type": "ALL",
"rows": 11,
"filtered": 100,
"attached_condition": "(tt.f1 > 2)",
"materialized": {
"query_block": {
"select_id": 3,
"filesort": {
"sort_key": "t1.f1",
"temporary_table": {
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 11,
"filtered": 100,
"attached_condition": "((t1.f1 < 7) and (t1.f1 > 2))"
}
}
}
}
}
}
}
}
}
}
},
"table": {
"table_name": "<derived4>",
"access_type": "ref",
"possible_keys": ["key0"],
"key": "key0",
"key_length": "5",
"used_key_parts": ["f1"],
"ref": ["x.f1"],
"rows": 2,
"filtered": 100,
"materialized": {
"query_block": {
"select_id": 4,
"filesort": {
"sort_key": "tt.f1",
"temporary_table": {
"table": {
"table_name": "<derived5>",
"access_type": "ALL",
"rows": 11,
"filtered": 100,
"attached_condition": "(tt.f1 > 2)",
"materialized": {
"query_block": {
"select_id": 5,
"filesort": {
"sort_key": "t1.f1",
"temporary_table": {
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 11,
"filtered": 100,
"attached_condition": "((t1.f1 < 7) and (t1.f1 > 2))"
}
}
}
}
}
}
}
}
}
}
}
}
}
select * from select * from
(select * from (select * from
(select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) x (select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) x
@ -523,9 +778,41 @@ explain extended
select * from ( select * from v1 where f1 < 7) tt; select * from ( select * from v1 where f1 < 7) tt;
id select_type table type possible_keys key key_len ref rows filtered Extra id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <derived3> ALL NULL NULL NULL NULL 11 100.00 Using where 1 PRIMARY <derived3> ALL NULL NULL NULL NULL 11 100.00 Using where
3 DERIVED t1 ALL NULL NULL NULL NULL 11 100.00 Using temporary; Using filesort 3 DERIVED t1 ALL NULL NULL NULL NULL 11 100.00 Using where; Using temporary; Using filesort
Warnings: Warnings:
Note 1003 select `v1`.`f1` AS `f1`,`v1`.`f11` AS `f11` from `test`.`v1` where (`v1`.`f1` < 7) Note 1003 select `v1`.`f1` AS `f1`,`v1`.`f11` AS `f11` from `test`.`v1` where (`v1`.`f1` < 7)
explain format=json
select * from ( select * from v1 where f1 < 7) tt;
EXPLAIN
{
"query_block": {
"select_id": 1,
"table": {
"table_name": "<derived3>",
"access_type": "ALL",
"rows": 11,
"filtered": 100,
"attached_condition": "(v1.f1 < 7)",
"materialized": {
"query_block": {
"select_id": 3,
"filesort": {
"sort_key": "t1.f1",
"temporary_table": {
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 11,
"filtered": 100,
"attached_condition": "(t1.f1 < 7)"
}
}
}
}
}
}
}
}
select * from ( select * from v1 where f1 < 7) tt; select * from ( select * from v1 where f1 < 7) tt;
f1 f11 f1 f11
1 1 1 1
@ -2354,7 +2641,7 @@ ON p.id = g.p_random
ORDER BY gallery_name ASC ORDER BY gallery_name ASC
; ;
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 2 Using filesort 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 10 Using filesort
1 PRIMARY p eq_ref PRIMARY PRIMARY 4 g.p_random 1 Using where 1 PRIMARY p eq_ref PRIMARY PRIMARY 4 g.p_random 1 Using where
2 DERIVED gal ALL NULL NULL NULL NULL 10 2 DERIVED gal ALL NULL NULL NULL NULL 10
3 DEPENDENT SUBQUERY pi ref gallery_id gallery_id 4 test.gal.id 4 Using temporary; Using filesort 3 DEPENDENT SUBQUERY pi ref gallery_id gallery_id 4 test.gal.id 4 Using temporary; Using filesort

2
mysql-test/r/distinct.result
View File

@ -918,7 +918,7 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 96 100.00 Using where; Using temporary 1 PRIMARY t1 ALL NULL NULL NULL NULL 96 100.00 Using where; Using temporary
1 PRIMARY <derived2> ref key0 key0 5 test.t1.i1 9 100.00 Using where 1 PRIMARY <derived2> ref key0 key0 5 test.t1.i1 9 100.00 Using where
1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (flat, BNL join) 1 PRIMARY t2 ALL NULL NULL NULL NULL 2 100.00 Using where; Using join buffer (flat, BNL join)
2 DERIVED t1 ALL NULL NULL NULL NULL 96 100.00 2 DERIVED t1 ALL NULL NULL NULL NULL 96 100.00 Using where
Warnings: Warnings:
Note 1003 select straight_join distinct `test`.`t1`.`id` AS `id` from `test`.`t1` join `test`.`v1` join `test`.`t2` where ((`test`.`t2`.`i` = `v1`.`id`) and (`v1`.`i1` = `test`.`t1`.`i1`) and (`v1`.`id` <> 3)) Note 1003 select straight_join distinct `test`.`t1`.`id` AS `id` from `test`.`t1` join `test`.`v1` join `test`.`t2` where ((`test`.`t2`.`i` = `v1`.`id`) and (`v1`.`i1` = `test`.`t1`.`i1`) and (`v1`.`id` <> 3))
set join_buffer_size=1024; set join_buffer_size=1024;

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

@ -485,6 +485,7 @@ EXPLAIN
"materialized": { "materialized": {
"query_block": { "query_block": {
"select_id": 2, "select_id": 2,
"having_condition": "(cnt > 0)",
"filesort": { "filesort": {
"sort_key": "t1.a", "sort_key": "t1.a",
"temporary_table": { "temporary_table": {

2
mysql-test/r/index_merge_myisam.result
View File

@ -292,7 +292,7 @@ set optimizer_switch='derived_merge=off,derived_with_keys=off';
explain select * from (select * from t1 where key1 = 3 or key2 =3) as Z where key8 >5; explain select * from (select * from t1 where key1 = 3 or key2 =3) as Z where key8 >5;
id select_type table type possible_keys key key_len ref rows Extra id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 2 Using where 1 PRIMARY <derived2> ALL NULL NULL NULL NULL 2 Using where
2 DERIVED t1 index_merge i1,i2 i1,i2 4,4 NULL 2 Using union(i1,i2); Using where 2 DERIVED t1 index_merge i1,i2,i8 i1,i2 4,4 NULL 2 Using union(i1,i2); Using where
set optimizer_switch=@tmp_optimizer_switch; set optimizer_switch=@tmp_optimizer_switch;
create table t3 like t0; create table t3 like t0;
insert into t3 select * from t0; insert into t3 select * from t0;

2
mysql-test/r/join.result
View File

@ -1491,7 +1491,7 @@ EXPLAIN EXTENDED
SELECT * FROM t1 JOIN v2 ON i1 = i2 WHERE a < b; SELECT * FROM t1 JOIN v2 ON i1 = i2 WHERE a < b;
id select_type table type possible_keys key key_len ref rows filtered Extra id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables 1 PRIMARY NULL NULL NULL NULL NULL NULL NULL NULL Impossible WHERE noticed after reading const tables
2 DERIVED t2 ALL NULL NULL NULL NULL 2 100.00 2 DERIVED t2 ALL NULL NULL NULL NULL 2 100.00 Using where
Warnings: Warnings:
Note 1003 select NULL AS `i1`,`v2`.`i2` AS `i2`,`v2`.`a` AS `a`,`v2`.`b` AS `b` from `test`.`v2` where ((`v2`.`i2` = NULL) and (`v2`.`a` < `v2`.`b`)) Note 1003 select NULL AS `i1`,`v2`.`i2` AS `i2`,`v2`.`a` AS `a`,`v2`.`b` AS `b` from `test`.`v2` where ((`v2`.`i2` = NULL) and (`v2`.`a` < `v2`.`b`))
DROP VIEW v2; DROP VIEW v2;

4
mysql-test/r/subselect_extra_no_semijoin.result
View File

@ -436,7 +436,7 @@ id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 2 Using where 1 PRIMARY t3 ALL NULL NULL NULL NULL 2 Using where
2 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 1 2 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 1
2 DEPENDENT SUBQUERY <derived3> ALL NULL NULL NULL NULL 3 Using where 2 DEPENDENT SUBQUERY <derived3> ALL NULL NULL NULL NULL 3 Using where
3 DERIVED t1 ALL NULL NULL NULL NULL 3 3 DERIVED t1 ALL NULL NULL NULL NULL 3 Using where
SELECT * FROM t3 SELECT * FROM t3
WHERE t3.b IN (SELECT v1.b FROM v1, t2 WHERE t3.b IN (SELECT v1.b FROM v1, t2
WHERE t2.c = v1.c AND t2.c = v1.b AND v1.b = t3.c); WHERE t2.c = v1.c AND t2.c = v1.b AND v1.b = t3.c);
@ -451,7 +451,7 @@ id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 2 Using where 1 PRIMARY t3 ALL NULL NULL NULL NULL 2 Using where
2 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 1 2 DEPENDENT SUBQUERY t2 system NULL NULL NULL NULL 1
2 DEPENDENT SUBQUERY <derived3> ref key1 key1 8 const,const 0 Using where 2 DEPENDENT SUBQUERY <derived3> ref key1 key1 8 const,const 0 Using where
3 DERIVED t1 ALL NULL NULL NULL NULL 3 3 DERIVED t1 ALL NULL NULL NULL NULL 3 Using where
SELECT * FROM t3 SELECT * FROM t3
WHERE t3.b IN (SELECT v1.b FROM v1, t2 WHERE t3.b IN (SELECT v1.b FROM v1, t2
WHERE t2.c = v1.c AND t2.c = v1.b AND v1.b = t3.c); WHERE t2.c = v1.c AND t2.c = v1.b AND v1.b = t3.c);

70
mysql-test/t/derived_cond_pushdown.test
View File

@ -78,6 +78,20 @@ create view v2_union as
select a, b, avg(c) as c from t1 select a, b, avg(c) as c from t1
where t1.c>300 group by a,b having c < 707; where t1.c>300 group by a,b having c < 707;
create view v3_union as
select a, b, (a+1) as c from t1
where t1.a<10
union
select a, b, c from t1
where t1.b>10 and t1.c>100;
create view v4_union as
select a, b, max(c)-100 as c from t1
where t1.a<10 group by a,b having c > 109
union
select a, b, (c+100) as c from t1
where t1.b>10;
create view v_double as create view v_double as
select a, avg(a/4) as avg_a, b, c from t1_double select a, avg(a/4) as avg_a, b, c from t1_double
where (b>12.2) group by b,c having (avg_a<22.333); where (b>12.2) group by b,c having (avg_a<22.333);
@ -683,6 +697,58 @@ eval $query;
eval explain $query; eval explain $query;
eval explain format=json $query; eval explain format=json $query;
--echo # using derived table with union of selects without aggregation
--echo # extracted conjunctive predicate: pushing in WHERE of both selects
let $query=
select * from v3_union as v,t2 where (v.a=t2.a) and (v.c>6);
eval $no_pushdown $query;
eval $query;
eval explain $query;
eval explain format=json $query;
--echo # using derived table with union of selects without aggregation
--echo # extracted conjunctive OR subformula: pushing in WHERE using equalities
let $query=
select * from v3_union as v,t2 where (v.a=t2.a) and ((t2.a>1) or (v.b<20));
eval $no_pushdown $query;
eval $query;
eval explain $query;
eval explain format=json $query;
--echo # using derived table with union of selects without aggregation
--echo # extracted the whole condition: in WHERE of both selects
let $query=
select * from v3_union as v,t2 where
(v.a=t2.a) and ((v.b=19) or (v.b=21)) and ((v.c<3) or (v.c>600));
eval $no_pushdown $query;
eval $query;
eval explain $query;
eval explain format=json $query;
--echo # using derived table with union of
--echo # a select without aggregation and a select with aggregation
--echo # extracted conjunctive predicate: pushing in WHERE of both selects
let $query=
select * from v4_union as v,t2 where (v.a=t2.a) and (v.b<20);
eval $no_pushdown $query;
eval $query;
eval explain $query;
eval explain format=json $query;
--echo # using derived table with union of
--echo # a select without aggregation and a select with aggregation
--echo # extracted subformula: pushing in WHERE of one select
--echo # extracted subformula: pushing in HAVING of the other select
--echo # extracted sub-subformula: pushing in WHERE of the other select
--echo # using an equality in all pushdowns
let $query=
select * from v4_union as v,t2 where
(v.a=t2.a) and ((t2.a<3) or (v.b<40)) and (v.c>500);
eval $no_pushdown $query;
eval $query;
eval explain $query;
eval explain format=json $query;
--echo # using embedded derived table : pushing the same conditions --echo # using embedded derived table : pushing the same conditions
--echo # using several derived tables : pushing in all tables --echo # using several derived tables : pushing in all tables
--echo # conjunctive subformula : pushing into WHERE --echo # conjunctive subformula : pushing into WHERE
@ -808,5 +874,7 @@ eval $query;
eval explain $query; eval explain $query;
eval explain format=json $query; eval explain format=json $query;
drop view v1,v2,v3,v4,v_union,v2_union,v_double,v_char,v_decimal; drop view v1,v2,v3,v4;
drop view v_union,v2_union,v3_union,v4_union;
drop view v_double,v_char,v_decimal;
drop table t1,t2,t1_double,t2_double,t1_char,t2_char,t1_decimal,t2_decimal; drop table t1,t2,t1_double,t2_double,t1_char,t2_char,t1_decimal,t2_decimal;

20
mysql-test/t/derived_view.test
View File

@ -113,6 +113,7 @@ select * from t1 join v2 on f1=f2;
show status like 'Handler_read%'; show status like 'Handler_read%';
explain extended select * from v1 join v4 on f1=f2; explain extended select * from v1 join v4 on f1=f2;
explain format=json select * from v1 join v4 on f1=f2;
select * from v1 join v4 on f1=f2; select * from v1 join v4 on f1=f2;
--echo merged derived in merged derived --echo merged derived in merged derived
@ -136,15 +137,24 @@ select * from (select * from
--echo materialized derived in materialized derived --echo materialized derived in materialized derived
explain extended select * from (select * from explain extended select * from (select * from
(select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) zz; (select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) zz;
explain format=json select * from (select * from
(select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) zz;
select * from (select * from select * from (select * from
(select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) zz; (select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) zz;
--echo mat in merged derived join mat in merged derived --echo mat in merged derived join mat in merged derived
set @save_optimizer_switch=@@optimizer_switch;
set optimizer_switch='condition_pushdown_for_derived=off';
explain extended select * from explain extended select * from
(select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) x (select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) x
join join
(select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) z (select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) z
on x.f1 = z.f1; on x.f1 = z.f1;
explain format=json select * from
(select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) x
join
(select * from (select * from t1 where f1 < 7 group by f1) tt where f1 > 2) z
on x.f1 = z.f1;
flush status; flush status;
select * from select * from
@ -154,6 +164,7 @@ join
on x.f1 = z.f1; on x.f1 = z.f1;
show status like 'Handler_read%'; show status like 'Handler_read%';
flush status; flush status;
set optimizer_switch=@save_optimizer_switch;
--echo merged in merged derived join merged in merged derived --echo merged in merged derived join merged in merged derived
explain extended select * from explain extended select * from
@ -181,6 +192,13 @@ join
(select * from (select * from
(select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) z (select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) z
on x.f1 = z.f1; on x.f1 = z.f1;
explain format=json select * from
(select * from
(select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) x
join
(select * from
(select * from t1 where f1 < 7 group by f1) tt where f1 > 2 group by f1) z
on x.f1 = z.f1;
select * from select * from
(select * from (select * from
@ -198,6 +216,8 @@ select * from (select * from v4 group by 1) tt;
--echo materialized view in merged derived --echo materialized view in merged derived
explain extended explain extended
select * from ( select * from v1 where f1 < 7) tt; select * from ( select * from v1 where f1 < 7) tt;
explain format=json
select * from ( select * from v1 where f1 < 7) tt;
select * from ( select * from v1 where f1 < 7) tt; select * from ( select * from v1 where f1 < 7) tt;
--echo merged view in a merged view in a merged derived --echo merged view in a merged view in a merged derived

36
sql/item.cc
View File

@ -6817,6 +6817,42 @@ Item *Item_field::derived_field_transformer_for_having(THD *thd, uchar *arg)
Item *Item_field::derived_field_transformer_for_where(THD *thd, uchar *arg) Item *Item_field::derived_field_transformer_for_where(THD *thd, uchar *arg)
{
Item *producing_item;
st_select_lex *sl= (st_select_lex *)arg;
List_iterator_fast<Item> li(sl->item_list);
table_map map= sl->master_unit()->derived->table->map;
if (used_tables() == map)
{
uint field_no= ((Item_field*) this)->field->field_index;
for (uint i= 0; i <= field_no; i++)
producing_item= li++;
return producing_item->build_clone(thd, thd->mem_root);
}
else if (((Item_field*)this)->item_equal)
{
Item_equal *cond= (Item_equal *) ((Item_field*)this)->item_equal;
Item_equal_fields_iterator it(*cond);
Item *item;
while ((item=it++))
{
if (item->used_tables() == map && item->type() == FIELD_ITEM)
{
Item_field *field_item= (Item_field *) item;
li.rewind();
uint field_no= ((Item_field*) this)->field->field_index;
for (uint i= 0; i <= field_no; i++)
producing_item= li++;
return producing_item->build_clone(thd, thd->mem_root);
}
}
}
return this;
}
Item *Item_field::derived_grouping_field_transformer_for_where(THD *thd,
uchar *arg)
{ {
st_select_lex *sl= (st_select_lex *)arg; st_select_lex *sl= (st_select_lex *)arg;
List_iterator<Grouping_tmp_field> li(sl->grouping_tmp_fields); List_iterator<Grouping_tmp_field> li(sl->grouping_tmp_fields);

8
sql/item.h
View File

@ -1695,6 +1695,9 @@ public:
{ return this; } { return this; }
virtual Item *derived_field_transformer_for_where(THD *thd, uchar *arg) virtual Item *derived_field_transformer_for_where(THD *thd, uchar *arg)
{ return this; } { return this; }
virtual Item *derived_grouping_field_transformer_for_where(THD *thd,
uchar *arg)
{ return this; }
virtual bool expr_cache_is_needed(THD *) { return FALSE; } virtual bool expr_cache_is_needed(THD *) { return FALSE; }
virtual Item *safe_charset_converter(THD *thd, CHARSET_INFO *tocs); virtual Item *safe_charset_converter(THD *thd, CHARSET_INFO *tocs);
bool needs_charset_converter(uint32 length, CHARSET_INFO *tocs) bool needs_charset_converter(uint32 length, CHARSET_INFO *tocs)
@ -2578,8 +2581,9 @@ public:
Item_field *field_for_view_update() { return this; } Item_field *field_for_view_update() { return this; }
int fix_outer_field(THD *thd, Field **field, Item **reference); int fix_outer_field(THD *thd, Field **field, Item **reference);
virtual Item *update_value_transformer(THD *thd, uchar *select_arg); virtual Item *update_value_transformer(THD *thd, uchar *select_arg);
virtual Item *derived_field_transformer_for_having(THD *thd, uchar *arg); Item *derived_field_transformer_for_having(THD *thd, uchar *arg);
virtual Item *derived_field_transformer_for_where(THD *thd, uchar *arg); Item *derived_field_transformer_for_where(THD *thd, uchar *arg);
Item *derived_grouping_field_transformer_for_where(THD *thd, uchar *arg);
virtual void print(String *str, enum_query_type query_type); virtual void print(String *str, enum_query_type query_type);
bool exclusive_dependence_on_table_processor(void *map); bool exclusive_dependence_on_table_processor(void *map);
bool exclusive_dependence_on_grouping_fields_processor(void *arg); bool exclusive_dependence_on_grouping_fields_processor(void *arg);

50
sql/sql_derived.cc
View File

@ -480,8 +480,10 @@ unconditional_materialization:
derived->set_materialized_derived(); derived->set_materialized_derived();
if (!derived->table || !derived->table->is_created()) if (!derived->table || !derived->table->is_created())
res= mysql_derived_create(thd, lex, derived); res= mysql_derived_create(thd, lex, derived);
#if 0
if (!res) if (!res)
res= mysql_derived_fill(thd, lex, derived); res= mysql_derived_fill(thd, lex, derived);
#endif
goto exit_merge; goto exit_merge;
} }
@ -1130,6 +1132,22 @@ bool pushdown_cond_for_derived(THD *thd, Item *cond, TABLE_LIST *derived)
if (!cond) if (!cond)
return false; return false;
st_select_lex_unit *unit= derived->get_unit();
st_select_lex *sl= unit->first_select();
/* Check whether any select of 'unit' allows condition pushdown */
bool any_select_allows_cond_pushdown= false;
for (; sl; sl= sl->next_select())
{
if (sl->cond_pushdown_is_allowed())
{
any_select_allows_cond_pushdown= true;
break;
}
}
if (!any_select_allows_cond_pushdown)
return false;
/* Do not push conditions into recursive with tables */ /* Do not push conditions into recursive with tables */
if (derived->is_recursive_with_table()) if (derived->is_recursive_with_table())
return false; return false;
@ -1150,11 +1168,11 @@ bool pushdown_cond_for_derived(THD *thd, Item *cond, TABLE_LIST *derived)
return false; return false;
} }
/* Push extracted_cond into every select of the unit specifying 'derived' */ /* Push extracted_cond into every select of the unit specifying 'derived' */
st_select_lex_unit *unit= derived->get_unit();
st_select_lex *save_curr_select= thd->lex->current_select; st_select_lex *save_curr_select= thd->lex->current_select;
st_select_lex *sl= unit->first_select();
for (; sl; sl= sl->next_select()) for (; sl; sl= sl->next_select())
{ {
if (!sl->cond_pushdown_is_allowed())
continue;
thd->lex->current_select= sl; thd->lex->current_select= sl;
/* /*
For each select of the unit except the last one For each select of the unit except the last one
@ -1165,6 +1183,31 @@ bool pushdown_cond_for_derived(THD *thd, Item *cond, TABLE_LIST *derived)
if (!extracted_cond_copy) if (!extracted_cond_copy)
continue; continue;
if (!sl->join->group_list && !sl->with_sum_func)
{
/* extracted_cond_copy is pushed into where of sl */
extracted_cond_copy= extracted_cond_copy->transform(thd,
&Item::derived_field_transformer_for_where,
(uchar*) sl);
if (extracted_cond_copy)
{
/*
Create the conjunction of the existing where condition of sl
and the pushed condition, take it as the new where condition of sl
and fix this new condition
*/
extracted_cond_copy->walk(&Item::cleanup_processor, 0, 0);
thd->change_item_tree(&sl->join->conds,
and_conds(thd, sl->join->conds,
extracted_cond_copy));
if (sl->join->conds->fix_fields(thd, &sl->join->conds))
goto err;
}
continue;
}
/* /*
Figure out what can be extracted from the pushed condition Figure out what can be extracted from the pushed condition
that could be pushed into the where clause of sl that could be pushed into the where clause of sl
@ -1182,7 +1225,7 @@ bool pushdown_cond_for_derived(THD *thd, Item *cond, TABLE_LIST *derived)
*/ */
if (cond_over_grouping_fields) if (cond_over_grouping_fields)
cond_over_grouping_fields= cond_over_grouping_fields->transform(thd, cond_over_grouping_fields= cond_over_grouping_fields->transform(thd,
&Item::derived_field_transformer_for_where, &Item::derived_grouping_field_transformer_for_where,
(uchar*) sl); (uchar*) sl);
if (cond_over_grouping_fields) if (cond_over_grouping_fields)
@ -1239,3 +1282,4 @@ err:
thd->lex->current_select= save_curr_select; thd->lex->current_select= save_curr_select;
return true; return true;
} }

3
sql/sql_lex.h
View File

@ -1150,6 +1150,9 @@ public:
bool have_window_funcs() const { return (window_funcs.elements !=0); } bool have_window_funcs() const { return (window_funcs.elements !=0); }
bool cond_pushdown_is_allowed() const
{ return !have_window_funcs() && !olap; }
private: private:
bool m_non_agg_field_used; bool m_non_agg_field_used;
bool m_agg_func_used; bool m_agg_func_used;