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Teach tid-scan code to make use of "ctid = ANY (array)" clauses, so that

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"ctid IN (list)" will still work after we convert IN to ScalarArrayOpExpr.
Make some minor efficiency improvements while at it, such as ensuring that
multiple TIDs are fetched in physical heap order.  And fix EXPLAIN so that
it shows what's really going on for a TID scan.
This commit is contained in:
Tom Lane
2005-11-26 22:14:57 +00:00
parent a66e2c8885
commit da27c0a1ef
15 changed files with 378 additions and 147 deletions
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4
src/include/optimizer/cost.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/cost.h,v 1.71 2005/10/15 02:49:45 momjian Exp $
* $PostgreSQL: pgsql/src/include/optimizer/cost.h,v 1.72 2005/11/26 22:14:57 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -61,7 +61,7 @@ extern void cost_bitmap_and_node(BitmapAndPath *path, PlannerInfo *root);
extern void cost_bitmap_or_node(BitmapOrPath *path, PlannerInfo *root);
extern void cost_bitmap_tree_node(Path *path, Cost *cost, Selectivity *selec);
extern void cost_tidscan(Path *path, PlannerInfo *root,
RelOptInfo *baserel, List *tideval);
RelOptInfo *baserel, List *tidquals);
extern void cost_subqueryscan(Path *path, RelOptInfo *baserel);
extern void cost_functionscan(Path *path, PlannerInfo *root,
RelOptInfo *baserel);

4
src/include/optimizer/pathnode.h
View File

@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/optimizer/pathnode.h,v 1.62 2005/10/15 02:49:45 momjian Exp $
* $PostgreSQL: pgsql/src/include/optimizer/pathnode.h,v 1.63 2005/11/26 22:14:57 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -45,7 +45,7 @@ extern BitmapOrPath *create_bitmap_or_path(PlannerInfo *root,
RelOptInfo *rel,
List *bitmapquals);
extern TidPath *create_tidscan_path(PlannerInfo *root, RelOptInfo *rel,
List *tideval);
List *tidquals);
extern AppendPath *create_append_path(RelOptInfo *rel, List *subpaths);
extern ResultPath *create_result_path(RelOptInfo *rel, Path *subpath,
List *constantqual);