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体验新版 GitCode,发现更多精彩内容 >>
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09a8912f
编写于
10月 25, 2000
作者:
T
Tom Lane
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电子邮件补丁
差异文件
Ensure clause_selectivity() behaves sanely when examining an uplevel Var
or a Var that references a subquery output.
上级
4ad9fe4c
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
32 addition
and
16 deletion
+32
-16
src/backend/optimizer/path/clausesel.c
src/backend/optimizer/path/clausesel.c
+32
-16
未找到文件。
src/backend/optimizer/path/clausesel.c
浏览文件 @
09a8912f
...
...
@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/clausesel.c,v 1.
39 2000/08/13 02:50:04
tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/path/clausesel.c,v 1.
40 2000/10/25 21:48:12
tgl Exp $
*
*-------------------------------------------------------------------------
*/
...
...
@@ -371,24 +371,40 @@ clause_selectivity(Query *root,
return
s1
;
if
(
IsA
(
clause
,
Var
))
{
Var
*
var
=
(
Var
*
)
clause
;
/*
* we have a bool Var. This is exactly equivalent to the clause:
* reln.attribute = 't' so we compute the selectivity as if that
* is what we have. The magic #define constants are a hack. I
* didn't want to have to do system cache look ups to find out all
* of that info.
* We probably shouldn't ever see an uplevel Var here, but if we
* do, return the default selectivity...
*/
Index
varno
=
((
Var
*
)
clause
)
->
varno
;
if
(
varRelid
==
0
||
varRelid
==
(
int
)
varno
)
s1
=
restriction_selectivity
(
F_EQSEL
,
BooleanEqualOperator
,
getrelid
(
varno
,
root
->
rtable
),
((
Var
*
)
clause
)
->
varattno
,
BoolGetDatum
(
true
),
SEL_CONSTANT
|
SEL_RIGHT
);
/* an outer-relation bool var is taken as always true... */
if
(
var
->
varlevelsup
==
0
&&
(
varRelid
==
0
||
varRelid
==
(
int
)
var
->
varno
))
{
RangeTblEntry
*
rte
=
rt_fetch
(
var
->
varno
,
root
->
rtable
);
if
(
rte
->
subquery
)
{
/*
* XXX not smart about subquery references...
* any way to do better?
*/
s1
=
0
.
5
;
}
else
{
/*
* A Var at the top of a clause must be a bool Var.
* This is equivalent to the clause reln.attribute = 't',
* so we compute the selectivity as if that is what we have.
*/
s1
=
restriction_selectivity
(
F_EQSEL
,
BooleanEqualOperator
,
rte
->
relid
,
var
->
varattno
,
BoolGetDatum
(
true
),
SEL_CONSTANT
|
SEL_RIGHT
);
}
}
}
else
if
(
IsA
(
clause
,
Param
))
{
...
...
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