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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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17
src/backend/optimizer/plan/setrefs.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/setrefs.c,v 1.118 2005/11/22 18:17:13 momjian Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/setrefs.c,v 1.119 2005/11/26 22:14:57 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -170,8 +170,7 @@ set_plan_references(Plan *plan, List *rtable)
case T_TidScan:
fix_expr_references(plan, (Node *) plan->targetlist);
fix_expr_references(plan, (Node *) plan->qual);
fix_expr_references(plan,
(Node *) ((TidScan *) plan)->tideval);
fix_expr_references(plan, (Node *) ((TidScan *) plan)->tidquals);
break;
case T_SubqueryScan:
/* Needs special treatment, see comments below */
@ -509,7 +508,7 @@ adjust_plan_varnos(Plan *plan, int rtoffset)
((TidScan *) plan)->scan.scanrelid += rtoffset;
adjust_expr_varnos((Node *) plan->targetlist, rtoffset);
adjust_expr_varnos((Node *) plan->qual, rtoffset);
adjust_expr_varnos((Node *) ((TidScan *) plan)->tideval,
adjust_expr_varnos((Node *) ((TidScan *) plan)->tidquals,
rtoffset);
break;
case T_SubqueryScan:
@ -916,11 +915,11 @@ set_inner_join_references(Plan *inner_plan,
TidScan *innerscan = (TidScan *) inner_plan;
Index innerrel = innerscan->scan.scanrelid;
innerscan->tideval = join_references(innerscan->tideval,
rtable,
outer_itlist,
NULL,
innerrel);
innerscan->tidquals = join_references(innerscan->tidquals,
rtable,
outer_itlist,
NULL,
innerrel);
}
}