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nexedi
MariaDB
Commits
06b70326
Commit
06b70326
authored
Sep 07, 2010
by
Martin Hansson
Browse files
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Plain Diff
Merge of fix for Bug#51070.
parents
41709256
babebf9c
Changes
4
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4 changed files
with
243 additions
and
32 deletions
+243
-32
mysql-test/r/subselect4.result
mysql-test/r/subselect4.result
+86
-0
mysql-test/t/subselect4.test
mysql-test/t/subselect4.test
+62
-0
sql/item_cmpfunc.cc
sql/item_cmpfunc.cc
+76
-3
sql/item_subselect.cc
sql/item_subselect.cc
+19
-29
No files found.
mysql-test/r/subselect4.result
View file @
06b70326
...
@@ -78,6 +78,92 @@ CREATE VIEW v1 AS SELECT 1 LIKE ( 1 IN ( SELECT 1 ) );
...
@@ -78,6 +78,92 @@ CREATE VIEW v1 AS SELECT 1 LIKE ( 1 IN ( SELECT 1 ) );
CREATE VIEW v2 AS SELECT 1 LIKE '%' ESCAPE ( 1 IN ( SELECT 1 ) );
CREATE VIEW v2 AS SELECT 1 LIKE '%' ESCAPE ( 1 IN ( SELECT 1 ) );
DROP VIEW v1, v2;
DROP VIEW v1, v2;
#
#
# Bug#51070: Query with a NOT IN subquery predicate returns a wrong
# result set
#
CREATE TABLE t1 ( a INT, b INT );
INSERT INTO t1 VALUES ( 1, NULL ), ( 2, NULL );
CREATE TABLE t2 ( c INT, d INT );
INSERT INTO t2 VALUES ( NULL, 3 ), ( NULL, 4 );
CREATE TABLE t3 ( e INT, f INT );
INSERT INTO t3 VALUES ( NULL, NULL ), ( NULL, NULL );
CREATE TABLE t4 ( a INT );
INSERT INTO t4 VALUES (1), (2), (3);
CREATE TABLE t5 ( a INT );
INSERT INTO t5 VALUES (NULL), (2);
EXPLAIN
SELECT * FROM t1 WHERE ( a, b ) NOT IN ( SELECT c, d FROM t2 );
id select_type table type possible_keys key key_len ref rows Extra
x PRIMARY x x x x x x x x
x DEPENDENT SUBQUERY x x x x x x x x
SELECT * FROM t1 WHERE ( a, b ) NOT IN ( SELECT c, d FROM t2 );
a b
EXPLAIN
SELECT * FROM t1 WHERE ( a, b ) NOT IN ( SELECT c, d FROM t2 ) IS NULL;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 2 Using where
2 DEPENDENT SUBQUERY t2 ALL NULL NULL NULL NULL 2 Using where
SELECT * FROM t1 WHERE ( a, b ) NOT IN ( SELECT c, d FROM t2 ) IS NULL;
a b
1 NULL
2 NULL
SELECT * FROM t1 WHERE ( a, b ) IN ( SELECT c, d FROM t2 ) IS NULL;
a b
1 NULL
2 NULL
SELECT * FROM t1 WHERE ( a, b ) NOT IN ( SELECT c, d FROM t2 ) IS UNKNOWN;
a b
1 NULL
2 NULL
SELECT * FROM t1 WHERE (( a, b ) NOT IN ( SELECT c, d FROM t2 )) IS UNKNOWN;
a b
1 NULL
2 NULL
SELECT * FROM t1 WHERE 1 = 1 AND ( a, b ) NOT IN ( SELECT c, d FROM t2 );
a b
EXPLAIN
SELECT * FROM t1 WHERE ( a, b ) NOT IN ( SELECT e, f FROM t3 );
id select_type table type possible_keys key key_len ref rows Extra
x PRIMARY x x x x x x x x
x DEPENDENT SUBQUERY x x x x x x x x
SELECT * FROM t1 WHERE ( a, b ) NOT IN ( SELECT e, f FROM t3 );
a b
EXPLAIN
SELECT * FROM t2 WHERE ( c, d ) NOT IN ( SELECT a, b FROM t1 );
id select_type table type possible_keys key key_len ref rows Extra
x PRIMARY x x x x x x x x
x DEPENDENT SUBQUERY x x x x x x x x
SELECT * FROM t2 WHERE ( c, d ) NOT IN ( SELECT a, b FROM t1 );
c d
EXPLAIN
SELECT * FROM t3 WHERE ( e, f ) NOT IN ( SELECT c, d FROM t2 );
id select_type table type possible_keys key key_len ref rows Extra
x PRIMARY x x x x x x x x
x DEPENDENT SUBQUERY x x x x x x x x
SELECT * FROM t3 WHERE ( e, f ) NOT IN ( SELECT c, d FROM t2 );
e f
EXPLAIN
SELECT * FROM t2 WHERE ( c, d ) NOT IN ( SELECT e, f FROM t3 );
id select_type table type possible_keys key key_len ref rows Extra
x PRIMARY x x x x x x x x
x DEPENDENT SUBQUERY x x x x x x x x
SELECT * FROM t2 WHERE ( c, d ) NOT IN ( SELECT e, f FROM t3 );
c d
SELECT * FROM t1 WHERE ( a, b ) NOT IN
( SELECT c, d FROM t2 WHERE c = 1 AND c <> 1 );
a b
1 NULL
2 NULL
SELECT * FROM t1 WHERE b NOT IN ( SELECT c FROM t2 WHERE c = 1 );
a b
1 NULL
2 NULL
SELECT * FROM t1 WHERE NULL NOT IN ( SELECT c FROM t2 WHERE c = 1 AND c <> 1 );
a b
1 NULL
2 NULL
DROP TABLE t1, t2, t3, t4, t5;
#
# End of 5.1 tests.
# End of 5.1 tests.
#
#
#
#
...
...
mysql-test/t/subselect4.test
View file @
06b70326
...
@@ -74,6 +74,68 @@ CREATE VIEW v1 AS SELECT 1 LIKE ( 1 IN ( SELECT 1 ) );
...
@@ -74,6 +74,68 @@ CREATE VIEW v1 AS SELECT 1 LIKE ( 1 IN ( SELECT 1 ) );
CREATE
VIEW
v2
AS
SELECT
1
LIKE
'%'
ESCAPE
(
1
IN
(
SELECT
1
)
);
CREATE
VIEW
v2
AS
SELECT
1
LIKE
'%'
ESCAPE
(
1
IN
(
SELECT
1
)
);
DROP
VIEW
v1
,
v2
;
DROP
VIEW
v1
,
v2
;
--
echo
#
--
echo
# Bug#51070: Query with a NOT IN subquery predicate returns a wrong
--
echo
# result set
--
echo
#
CREATE
TABLE
t1
(
a
INT
,
b
INT
);
INSERT
INTO
t1
VALUES
(
1
,
NULL
),
(
2
,
NULL
);
CREATE
TABLE
t2
(
c
INT
,
d
INT
);
INSERT
INTO
t2
VALUES
(
NULL
,
3
),
(
NULL
,
4
);
CREATE
TABLE
t3
(
e
INT
,
f
INT
);
INSERT
INTO
t3
VALUES
(
NULL
,
NULL
),
(
NULL
,
NULL
);
CREATE
TABLE
t4
(
a
INT
);
INSERT
INTO
t4
VALUES
(
1
),
(
2
),
(
3
);
CREATE
TABLE
t5
(
a
INT
);
INSERT
INTO
t5
VALUES
(
NULL
),
(
2
);
--
replace_column
1
x
3
x
4
x
5
x
6
x
7
x
8
x
9
x
10
x
EXPLAIN
SELECT
*
FROM
t1
WHERE
(
a
,
b
)
NOT
IN
(
SELECT
c
,
d
FROM
t2
);
SELECT
*
FROM
t1
WHERE
(
a
,
b
)
NOT
IN
(
SELECT
c
,
d
FROM
t2
);
EXPLAIN
SELECT
*
FROM
t1
WHERE
(
a
,
b
)
NOT
IN
(
SELECT
c
,
d
FROM
t2
)
IS
NULL
;
SELECT
*
FROM
t1
WHERE
(
a
,
b
)
NOT
IN
(
SELECT
c
,
d
FROM
t2
)
IS
NULL
;
SELECT
*
FROM
t1
WHERE
(
a
,
b
)
IN
(
SELECT
c
,
d
FROM
t2
)
IS
NULL
;
SELECT
*
FROM
t1
WHERE
(
a
,
b
)
NOT
IN
(
SELECT
c
,
d
FROM
t2
)
IS
UNKNOWN
;
SELECT
*
FROM
t1
WHERE
((
a
,
b
)
NOT
IN
(
SELECT
c
,
d
FROM
t2
))
IS
UNKNOWN
;
SELECT
*
FROM
t1
WHERE
1
=
1
AND
(
a
,
b
)
NOT
IN
(
SELECT
c
,
d
FROM
t2
);
--
replace_column
1
x
3
x
4
x
5
x
6
x
7
x
8
x
9
x
10
x
EXPLAIN
SELECT
*
FROM
t1
WHERE
(
a
,
b
)
NOT
IN
(
SELECT
e
,
f
FROM
t3
);
SELECT
*
FROM
t1
WHERE
(
a
,
b
)
NOT
IN
(
SELECT
e
,
f
FROM
t3
);
--
replace_column
1
x
3
x
4
x
5
x
6
x
7
x
8
x
9
x
10
x
EXPLAIN
SELECT
*
FROM
t2
WHERE
(
c
,
d
)
NOT
IN
(
SELECT
a
,
b
FROM
t1
);
SELECT
*
FROM
t2
WHERE
(
c
,
d
)
NOT
IN
(
SELECT
a
,
b
FROM
t1
);
--
replace_column
1
x
3
x
4
x
5
x
6
x
7
x
8
x
9
x
10
x
EXPLAIN
SELECT
*
FROM
t3
WHERE
(
e
,
f
)
NOT
IN
(
SELECT
c
,
d
FROM
t2
);
SELECT
*
FROM
t3
WHERE
(
e
,
f
)
NOT
IN
(
SELECT
c
,
d
FROM
t2
);
--
replace_column
1
x
3
x
4
x
5
x
6
x
7
x
8
x
9
x
10
x
EXPLAIN
SELECT
*
FROM
t2
WHERE
(
c
,
d
)
NOT
IN
(
SELECT
e
,
f
FROM
t3
);
SELECT
*
FROM
t2
WHERE
(
c
,
d
)
NOT
IN
(
SELECT
e
,
f
FROM
t3
);
SELECT
*
FROM
t1
WHERE
(
a
,
b
)
NOT
IN
(
SELECT
c
,
d
FROM
t2
WHERE
c
=
1
AND
c
<>
1
);
SELECT
*
FROM
t1
WHERE
b
NOT
IN
(
SELECT
c
FROM
t2
WHERE
c
=
1
);
SELECT
*
FROM
t1
WHERE
NULL
NOT
IN
(
SELECT
c
FROM
t2
WHERE
c
=
1
AND
c
<>
1
);
DROP
TABLE
t1
,
t2
,
t3
,
t4
,
t5
;
--
echo
#
--
echo
#
--
echo
# End of 5.1 tests.
--
echo
# End of 5.1 tests.
...
...
sql/item_cmpfunc.cc
View file @
06b70326
...
@@ -1763,6 +1763,76 @@ bool Item_in_optimizer::fix_fields(THD *thd, Item **ref)
...
@@ -1763,6 +1763,76 @@ bool Item_in_optimizer::fix_fields(THD *thd, Item **ref)
}
}
/**
The implementation of optimized \<outer expression\> [NOT] IN \<subquery\>
predicates. The implementation works as follows.
For the current value of the outer expression
- If it contains only NULL values, the original (before rewrite by the
Item_in_subselect rewrite methods) inner subquery is non-correlated and
was previously executed, there is no need to re-execute it, and the
previous return value is returned.
- If it contains NULL values, check if there is a partial match for the
inner query block by evaluating it. For clarity we repeat here the
transformation previously performed on the sub-query. The expression
<tt>
( oc_1, ..., oc_n )
\<in predicate\>
( SELECT ic_1, ..., ic_n
FROM \<table\>
WHERE \<inner where\>
)
</tt>
was transformed into
<tt>
( oc_1, ..., oc_n )
\<in predicate\>
( SELECT ic_1, ..., ic_n
FROM \<table\>
WHERE \<inner where\> AND ... ( ic_k = oc_k OR ic_k IS NULL )
HAVING ... NOT ic_k IS NULL
)
</tt>
The evaluation will now proceed according to special rules set up
elsewhere. These rules include:
- The HAVING NOT \<inner column\> IS NULL conditions added by the
aforementioned rewrite methods will detect whether they evaluated (and
rejected) a NULL value and if so, will cause the subquery to evaluate
to NULL.
- The added WHERE and HAVING conditions are present only for those inner
columns that correspond to outer column that are not NULL at the moment.
- If there is an eligible index for executing the subquery, the special
access method "Full scan on NULL key" is employed which ensures that
the inner query will detect if there are NULL values resulting from the
inner query. This access method will quietly resort to table scan if it
needs to find NULL values as well.
- Under these conditions, the sub-query need only be evaluated in order to
find out whether it produced any rows.
- If it did, we know that there was a partial match since there are
NULL values in the outer row expression.
- If it did not, the result is FALSE or UNKNOWN. If at least one of the
HAVING sub-predicates rejected a NULL value corresponding to an outer
non-NULL, and hence the inner query block returns UNKNOWN upon
evaluation, there was a partial match and the result is UNKNOWN.
- If it contains no NULL values, the call is forwarded to the inner query
block.
@see Item_in_subselect::val_bool()
@see Item_is_not_null_test::val_int()
*/
longlong
Item_in_optimizer
::
val_int
()
longlong
Item_in_optimizer
::
val_int
()
{
{
bool
tmp
;
bool
tmp
;
...
@@ -1816,7 +1886,7 @@ longlong Item_in_optimizer::val_int()
...
@@ -1816,7 +1886,7 @@ longlong Item_in_optimizer::val_int()
all_left_cols_null
=
false
;
all_left_cols_null
=
false
;
}
}
if
(
!
((
Item_in_subselect
*
)
args
[
1
])
->
is_correlated
&&
if
(
!
item_subs
->
is_correlated
&&
all_left_cols_null
&&
result_for_null_param
!=
UNKNOWN
)
all_left_cols_null
&&
result_for_null_param
!=
UNKNOWN
)
{
{
/*
/*
...
@@ -1830,8 +1900,11 @@ longlong Item_in_optimizer::val_int()
...
@@ -1830,8 +1900,11 @@ longlong Item_in_optimizer::val_int()
else
else
{
{
/* The subquery has to be evaluated */
/* The subquery has to be evaluated */
(
void
)
args
[
1
]
->
val_bool_result
();
(
void
)
item_subs
->
val_bool_result
();
null_value
=
!
item_subs
->
engine
->
no_rows
();
if
(
item_subs
->
engine
->
no_rows
())
null_value
=
item_subs
->
null_value
;
else
null_value
=
TRUE
;
if
(
all_left_cols_null
)
if
(
all_left_cols_null
)
result_for_null_param
=
null_value
;
result_for_null_param
=
null_value
;
}
}
...
...
sql/item_subselect.cc
View file @
06b70326
...
@@ -55,7 +55,7 @@ Item_subselect::Item_subselect():
...
@@ -55,7 +55,7 @@ Item_subselect::Item_subselect():
item value is NULL if select_subselect not changed this value
item value is NULL if select_subselect not changed this value
(i.e. some rows will be found returned)
(i.e. some rows will be found returned)
*/
*/
null_value
=
1
;
null_value
=
TRUE
;
}
}
...
@@ -435,9 +435,9 @@ void Item_maxmin_subselect::print(String *str, enum_query_type query_type)
...
@@ -435,9 +435,9 @@ void Item_maxmin_subselect::print(String *str, enum_query_type query_type)
void
Item_singlerow_subselect
::
reset
()
void
Item_singlerow_subselect
::
reset
()
{
{
null_value
=
1
;
null_value
=
TRUE
;
if
(
value
)
if
(
value
)
value
->
null_value
=
1
;
value
->
null_value
=
TRUE
;
}
}
...
@@ -582,7 +582,7 @@ double Item_singlerow_subselect::val_real()
...
@@ -582,7 +582,7 @@ double Item_singlerow_subselect::val_real()
DBUG_ASSERT
(
fixed
==
1
);
DBUG_ASSERT
(
fixed
==
1
);
if
(
!
exec
()
&&
!
value
->
null_value
)
if
(
!
exec
()
&&
!
value
->
null_value
)
{
{
null_value
=
0
;
null_value
=
FALSE
;
return
value
->
val_real
();
return
value
->
val_real
();
}
}
else
else
...
@@ -597,7 +597,7 @@ longlong Item_singlerow_subselect::val_int()
...
@@ -597,7 +597,7 @@ longlong Item_singlerow_subselect::val_int()
DBUG_ASSERT
(
fixed
==
1
);
DBUG_ASSERT
(
fixed
==
1
);
if
(
!
exec
()
&&
!
value
->
null_value
)
if
(
!
exec
()
&&
!
value
->
null_value
)
{
{
null_value
=
0
;
null_value
=
FALSE
;
return
value
->
val_int
();
return
value
->
val_int
();
}
}
else
else
...
@@ -611,7 +611,7 @@ String *Item_singlerow_subselect::val_str(String *str)
...
@@ -611,7 +611,7 @@ String *Item_singlerow_subselect::val_str(String *str)
{
{
if
(
!
exec
()
&&
!
value
->
null_value
)
if
(
!
exec
()
&&
!
value
->
null_value
)
{
{
null_value
=
0
;
null_value
=
FALSE
;
return
value
->
val_str
(
str
);
return
value
->
val_str
(
str
);
}
}
else
else
...
@@ -626,7 +626,7 @@ my_decimal *Item_singlerow_subselect::val_decimal(my_decimal *decimal_value)
...
@@ -626,7 +626,7 @@ my_decimal *Item_singlerow_subselect::val_decimal(my_decimal *decimal_value)
{
{
if
(
!
exec
()
&&
!
value
->
null_value
)
if
(
!
exec
()
&&
!
value
->
null_value
)
{
{
null_value
=
0
;
null_value
=
FALSE
;
return
value
->
val_decimal
(
decimal_value
);
return
value
->
val_decimal
(
decimal_value
);
}
}
else
else
...
@@ -641,7 +641,7 @@ bool Item_singlerow_subselect::val_bool()
...
@@ -641,7 +641,7 @@ bool Item_singlerow_subselect::val_bool()
{
{
if
(
!
exec
()
&&
!
value
->
null_value
)
if
(
!
exec
()
&&
!
value
->
null_value
)
{
{
null_value
=
0
;
null_value
=
FALSE
;
return
value
->
val_bool
();
return
value
->
val_bool
();
}
}
else
else
...
@@ -659,7 +659,7 @@ Item_exists_subselect::Item_exists_subselect(st_select_lex *select_lex):
...
@@ -659,7 +659,7 @@ Item_exists_subselect::Item_exists_subselect(st_select_lex *select_lex):
bool
val_bool
();
bool
val_bool
();
init
(
select_lex
,
new
select_exists_subselect
(
this
));
init
(
select_lex
,
new
select_exists_subselect
(
this
));
max_columns
=
UINT_MAX
;
max_columns
=
UINT_MAX
;
null_value
=
0
;
//can't be NULL
null_value
=
FALSE
;
//can't be NULL
maybe_null
=
0
;
//can't be NULL
maybe_null
=
0
;
//can't be NULL
value
=
0
;
value
=
0
;
DBUG_VOID_RETURN
;
DBUG_VOID_RETURN
;
...
@@ -822,15 +822,14 @@ double Item_in_subselect::val_real()
...
@@ -822,15 +822,14 @@ double Item_in_subselect::val_real()
*/
*/
DBUG_ASSERT
(
0
);
DBUG_ASSERT
(
0
);
DBUG_ASSERT
(
fixed
==
1
);
DBUG_ASSERT
(
fixed
==
1
);
null_value
=
0
;
null_value
=
was_null
=
FALSE
;
if
(
exec
())
if
(
exec
())
{
{
reset
();
reset
();
null_value
=
1
;
return
0
;
return
0
;
}
}
if
(
was_null
&&
!
value
)
if
(
was_null
&&
!
value
)
null_value
=
1
;
null_value
=
TRUE
;
return
(
double
)
value
;
return
(
double
)
value
;
}
}
...
@@ -843,15 +842,14 @@ longlong Item_in_subselect::val_int()
...
@@ -843,15 +842,14 @@ longlong Item_in_subselect::val_int()
*/
*/
DBUG_ASSERT
(
0
);
DBUG_ASSERT
(
0
);
DBUG_ASSERT
(
fixed
==
1
);
DBUG_ASSERT
(
fixed
==
1
);
null_value
=
0
;
null_value
=
was_null
=
FALSE
;
if
(
exec
())
if
(
exec
())
{
{
reset
();
reset
();
null_value
=
1
;
return
0
;
return
0
;
}
}
if
(
was_null
&&
!
value
)
if
(
was_null
&&
!
value
)
null_value
=
1
;
null_value
=
TRUE
;
return
value
;
return
value
;
}
}
...
@@ -864,16 +862,15 @@ String *Item_in_subselect::val_str(String *str)
...
@@ -864,16 +862,15 @@ String *Item_in_subselect::val_str(String *str)
*/
*/
DBUG_ASSERT
(
0
);
DBUG_ASSERT
(
0
);
DBUG_ASSERT
(
fixed
==
1
);
DBUG_ASSERT
(
fixed
==
1
);
null_value
=
0
;
null_value
=
was_null
=
FALSE
;
if
(
exec
())
if
(
exec
())
{
{
reset
();
reset
();
null_value
=
1
;
return
0
;
return
0
;
}
}
if
(
was_null
&&
!
value
)
if
(
was_null
&&
!
value
)
{
{
null_value
=
1
;
null_value
=
TRUE
;
return
0
;
return
0
;
}
}
str
->
set
((
ulonglong
)
value
,
&
my_charset_bin
);
str
->
set
((
ulonglong
)
value
,
&
my_charset_bin
);
...
@@ -884,20 +881,14 @@ String *Item_in_subselect::val_str(String *str)
...
@@ -884,20 +881,14 @@ String *Item_in_subselect::val_str(String *str)
bool
Item_in_subselect
::
val_bool
()
bool
Item_in_subselect
::
val_bool
()
{
{
DBUG_ASSERT
(
fixed
==
1
);
DBUG_ASSERT
(
fixed
==
1
);
null_value
=
0
;
null_value
=
was_null
=
FALSE
;
if
(
exec
())
if
(
exec
())
{
{
reset
();
reset
();
/*
Must mark the IN predicate as NULL so as to make sure an enclosing NOT
predicate will return FALSE. See the comments in
subselect_uniquesubquery_engine::copy_ref_key for further details.
*/
null_value
=
1
;
return
0
;
return
0
;
}
}
if
(
was_null
&&
!
value
)
if
(
was_null
&&
!
value
)
null_value
=
1
;
null_value
=
TRUE
;
return
value
;
return
value
;
}
}
...
@@ -908,16 +899,15 @@ my_decimal *Item_in_subselect::val_decimal(my_decimal *decimal_value)
...
@@ -908,16 +899,15 @@ my_decimal *Item_in_subselect::val_decimal(my_decimal *decimal_value)
method should not be used
method should not be used
*/
*/
DBUG_ASSERT
(
0
);
DBUG_ASSERT
(
0
);
null_value
=
0
;
null_value
=
was_null
=
FALSE
;
DBUG_ASSERT
(
fixed
==
1
);
DBUG_ASSERT
(
fixed
==
1
);
if
(
exec
())
if
(
exec
())
{
{
reset
();
reset
();
null_value
=
1
;
return
0
;
return
0
;
}
}
if
(
was_null
&&
!
value
)
if
(
was_null
&&
!
value
)
null_value
=
1
;
null_value
=
TRUE
;
int2my_decimal
(
E_DEC_FATAL_ERROR
,
value
,
0
,
decimal_value
);
int2my_decimal
(
E_DEC_FATAL_ERROR
,
value
,
0
,
decimal_value
);
return
decimal_value
;
return
decimal_value
;
}
}
...
...
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