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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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25
src/backend/commands/explain.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1994-5, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/explain.c,v 1.140 2005/11/22 18:17:09 momjian Exp $
* $PostgreSQL: pgsql/src/backend/commands/explain.c,v 1.141 2005/11/26 22:14:56 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -724,7 +724,6 @@ explain_outNode(StringInfo str,
str, indent, es);
/* FALL THRU */
case T_SeqScan:
case T_TidScan:
case T_SubqueryScan:
case T_FunctionScan:
show_scan_qual(plan->qual,
@ -733,6 +732,28 @@ explain_outNode(StringInfo str,
outer_plan,
str, indent, es);
break;
case T_TidScan:
{
/*
* The tidquals list has OR semantics, so be sure to show it
* as an OR condition.
*/
List *tidquals = ((TidScan *) plan)->tidquals;
if (list_length(tidquals) > 1)
tidquals = list_make1(make_orclause(tidquals));
show_scan_qual(tidquals,
"TID Cond",
((Scan *) plan)->scanrelid,
outer_plan,
str, indent, es);
show_scan_qual(plan->qual,
"Filter",
((Scan *) plan)->scanrelid,
outer_plan,
str, indent, es);
}
break;
case T_NestLoop:
show_upper_qual(((NestLoop *) plan)->join.joinqual,
"Join Filter",