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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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9
src/include/nodes/relation.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/nodes/relation.h,v 1.120 2005/11/14 23:54:23 tgl Exp $
* $PostgreSQL: pgsql/src/include/nodes/relation.h,v 1.121 2005/11/26 22:14:57 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -503,13 +503,14 @@ typedef struct BitmapOrPath
/*
* TidPath represents a scan by TID
*
* tideval is an implicitly OR'ed list of quals of the form CTID = something.
* Note they are bare quals, not RestrictInfos.
* tidquals is an implicitly OR'ed list of qual expressions of the form
* "CTID = pseudoconstant" or "CTID = ANY(pseudoconstant_array)".
* Note they are bare expressions, not RestrictInfos.
*/
typedef struct TidPath
{
Path path;
List *tideval; /* qual(s) involving CTID = something */
List *tidquals; /* qual(s) involving CTID = something */
} TidPath;
/*