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体验新版 GitCode,发现更多精彩内容 >>
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ab164850
编写于
10月 17, 2008
作者:
T
Tom Lane
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电子邮件补丁
差异文件
Improve comments about RelOptInfo.reltargetlist.
上级
2a0083ed
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1
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1 changed file
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+7
-5
src/include/nodes/relation.h
src/include/nodes/relation.h
+7
-5
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src/include/nodes/relation.h
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ab164850
...
...
@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/nodes/relation.h,v 1.16
0 2008/10/04 21:56:5
5 tgl Exp $
* $PostgreSQL: pgsql/src/include/nodes/relation.h,v 1.16
1 2008/10/17 20:23:4
5 tgl Exp $
*
*-------------------------------------------------------------------------
*/
...
...
@@ -244,8 +244,10 @@ typedef struct PlannerInfo
* width - avg. number of bytes per tuple in the relation after the
* appropriate projections have been done (ie, output width)
* reltargetlist - List of Var nodes for the attributes we need to
* output from this relation (in no particular order)
* NOTE: in a child relation, may contain RowExprs
* output from this relation (in no particular order,
* but all rels of an appendrel set must use same order)
* NOTE: in a child relation, may contain RowExpr or
* ConvertRowtypeExpr representing a whole-row Var
* pathlist - List of Path nodes, one for each potentially useful
* method of generating the relation
* cheapest_startup_path - the pathlist member with lowest startup cost
...
...
@@ -337,7 +339,7 @@ typedef struct RelOptInfo
int
width
;
/* estimated avg width of result tuples */
/* materialization information */
List
*
reltargetlist
;
/*
needed Vars
*/
List
*
reltargetlist
;
/*
Vars to be output by scan of relation
*/
List
*
pathlist
;
/* Path structures */
struct
Path
*
cheapest_startup_path
;
struct
Path
*
cheapest_total_path
;
...
...
@@ -350,7 +352,7 @@ typedef struct RelOptInfo
AttrNumber
max_attr
;
/* largest attrno of rel */
Relids
*
attr_needed
;
/* array indexed [min_attr .. max_attr] */
int32
*
attr_widths
;
/* array indexed [min_attr .. max_attr] */
List
*
indexlist
;
List
*
indexlist
;
/* list of IndexOptInfo */
BlockNumber
pages
;
double
tuples
;
struct
Plan
*
subplan
;
/* if subquery */
...
...
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