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体验新版 GitCode,发现更多精彩内容 >>
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974e3cf3
编写于
8月 27, 2005
作者:
T
Tom Lane
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差异文件
cost_agg really ought to charge something per output tuple; else there
are cases where it appears to have zero run cost.
上级
4e5fbb34
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1 changed file
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5 addition
and
3 deletion
+5
-3
src/backend/optimizer/path/costsize.c
src/backend/optimizer/path/costsize.c
+5
-3
未找到文件。
src/backend/optimizer/path/costsize.c
浏览文件 @
974e3cf3
...
...
@@ -49,7 +49,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/path/costsize.c,v 1.14
6 2005/06/05 22:32:55
tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/path/costsize.c,v 1.14
7 2005/08/27 22:37:00
tgl Exp $
*
*-------------------------------------------------------------------------
*/
...
...
@@ -872,7 +872,7 @@ cost_agg(Path *path, PlannerInfo *root,
* for grouping comparisons.
*
* We will produce a single output tuple if not grouping, and a tuple per
* group otherwise.
* group otherwise.
We charge cpu_tuple_cost for each output tuple.
*
* Note: in this cost model, AGG_SORTED and AGG_HASHED have exactly the
* same total CPU cost, but AGG_SORTED has lower startup cost. If the
...
...
@@ -888,7 +888,7 @@ cost_agg(Path *path, PlannerInfo *root,
startup_cost
=
input_total_cost
;
startup_cost
+=
cpu_operator_cost
*
(
input_tuples
+
1
)
*
numAggs
;
/* we aren't grouping */
total_cost
=
startup_cost
;
total_cost
=
startup_cost
+
cpu_tuple_cost
;
}
else
if
(
aggstrategy
==
AGG_SORTED
)
{
...
...
@@ -899,6 +899,7 @@ cost_agg(Path *path, PlannerInfo *root,
total_cost
+=
cpu_operator_cost
*
input_tuples
*
numGroupCols
;
total_cost
+=
cpu_operator_cost
*
input_tuples
*
numAggs
;
total_cost
+=
cpu_operator_cost
*
numGroups
*
numAggs
;
total_cost
+=
cpu_tuple_cost
*
numGroups
;
}
else
{
...
...
@@ -908,6 +909,7 @@ cost_agg(Path *path, PlannerInfo *root,
startup_cost
+=
cpu_operator_cost
*
input_tuples
*
numAggs
;
total_cost
=
startup_cost
;
total_cost
+=
cpu_operator_cost
*
numGroups
*
numAggs
;
total_cost
+=
cpu_tuple_cost
*
numGroups
;
}
path
->
startup_cost
=
startup_cost
;
...
...
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