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reporting empty result added in case of max/min optimisation of ALL/ANY/SOME subqueries

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fixed null processing in NOT operation used in ALL subquery (Bug #6247)


mysql-test/r/subselect.result:
  new tests of ALL/ANY wiews
mysql-test/t/subselect.test:
  new tests of ALL/ANY wiews
sql/item_cmpfunc.cc:
  fixed special NOT ALL processing
  fixed processing max/min optimized subqueries with empty results (added methods to detect empty results) and special NOP operation to process them for SOME/ANY sobqueries
sql/item_cmpfunc.h:
  fixed processing max/min optimized subqueries with empty results (added methods to detect empty results) and special NOP operation to process them for SOME/ANY sobqueries
sql/item_subselect.cc:
  reporting empty result added for max/min subqueries
sql/item_subselect.h:
  reporting empty result added for max/min subqueries
sql/item_sum.cc:
  reporting empty result added fox max/min aggregate functions
sql/item_sum.h:
  reporting empty result added fox max/min aggregate functions
sql/sql_class.cc:
  reporting empty result added for max/min subqueries
sql/sql_parse.cc:
  reporting empty result added for max/min subqueries
sql/sql_union.cc:
  reporting empty result added for max/min subqueries
This commit is contained in:
unknown
2004-11-18 18:10:07 +02:00
parent 3a301ac1f8
commit 9438c2ca76
11 changed files with 230 additions and 26 deletions
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76
mysql-test/r/subselect.result
View File

@ -269,7 +269,7 @@ id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 Using where
2 SUBQUERY t2 ALL NULL NULL NULL NULL 3
Warnings:
Note 1003 select test.t3.a AS `a` from test.t3 where (test.t3.a >= (select min(test.t2.b) from test.t2))
Note 1003 select test.t3.a AS `a` from test.t3 where <nop>((test.t3.a >= (select min(test.t2.b) from test.t2)))
select * from t3 where a >= all (select b from t2);
a
7
@ -1488,6 +1488,71 @@ id select_type table type possible_keys key key_len ref rows Extra
2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
Warnings:
Note 1003 select test.t3.a AS `a` from test.t3 where <not>((test.t3.a < (select max(test.t2.b) from test.t2)))
select * from t3 where a >= some (select b from t2);
a
6
7
3
explain extended select * from t3 where a >= some (select b from t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 Using where
2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
Warnings:
Note 1003 select test.t3.a AS `a` from test.t3 where <nop>((test.t3.a >= (select min(test.t2.b) from test.t2)))
select * from t3 where a >= all (select b from t2 group by 1);
a
6
7
3
explain extended select * from t3 where a >= all (select b from t2 group by 1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 Using where
2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
Warnings:
Note 1003 select test.t3.a AS `a` from test.t3 where <not>((test.t3.a < <max>(select test.t2.b AS `b` from test.t2 group by test.t2.b)))
select * from t3 where a >= some (select b from t2 group by 1);
a
6
7
3
explain extended select * from t3 where a >= some (select b from t2 group by 1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t3 ALL NULL NULL NULL NULL 3 Using where
2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
Warnings:
Note 1003 select test.t3.a AS `a` from test.t3 where <nop>((test.t3.a >= <min>(select test.t2.b AS `b` from test.t2 group by test.t2.b)))
select * from t3 where NULL >= any (select b from t2);
a
explain extended select * from t3 where NULL >= any (select b from t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
Warnings:
Note 1003 select test.t3.a AS `a` from test.t3
select * from t3 where NULL >= any (select b from t2 group by 1);
a
explain extended select * from t3 where NULL >= any (select b from t2 group by 1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
Warnings:
Note 1003 select test.t3.a AS `a` from test.t3
select * from t3 where NULL >= some (select b from t2);
a
explain extended select * from t3 where NULL >= some (select b from t2);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
Warnings:
Note 1003 select test.t3.a AS `a` from test.t3
select * from t3 where NULL >= some (select b from t2 group by 1);
a
explain extended select * from t3 where NULL >= some (select b from t2 group by 1);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
2 SUBQUERY t2 system NULL NULL NULL NULL 0 const row not found
Warnings:
Note 1003 select test.t3.a AS `a` from test.t3
insert into t2 values (2,2), (2,1), (3,3), (3,1);
select * from t3 where a > all (select max(b) from t2 group by a);
a
@ -1990,3 +2055,12 @@ ac
700
NULL
drop tables t1,t2;
create table t1 (s1 int);
insert into t1 values (1),(null);
select * from t1 where s1 < all (select s1 from t1);
s1
select s1, s1 < all (select s1 from t1) from t1;
s1 s1 < all (select s1 from t1)
1 0
NULL NULL
drop table t1;