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Reimplementation of UNION/INTERSECT/EXCEPT. INTERSECT/EXCEPT now meet the

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SQL92 semantics, including support for ALL option.  All three can be used
in subqueries and views.  DISTINCT and ORDER BY work now in views, too.
This rewrite fixes many problems with cross-datatype UNIONs and INSERT/SELECT
where the SELECT yields different datatypes than the INSERT needs.  I did
that by making UNION subqueries and SELECT in INSERT be treated like
subselects-in-FROM, thereby allowing an extra level of targetlist where the
datatype conversions can be inserted safely.
INITDB NEEDED!
This commit is contained in:
Tom Lane
2000-10-05 19:11:39 +00:00
parent 5292637f52
commit 05e3d0ee86
51 changed files with 2621 additions and 1935 deletions
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12
src/backend/optimizer/plan/setrefs.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/setrefs.c,v 1.66 2000/09/29 18:21:33 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/setrefs.c,v 1.67 2000/10/05 19:11:29 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -103,9 +103,15 @@ set_plan_references(Plan *plan)
fix_expr_references(plan, (Node *) plan->qual);
break;
case T_SubqueryScan:
/*
* We do not do set_uppernode_references() here, because
* a SubqueryScan will always have been created with correct
* references to its subplan's outputs to begin with.
*/
fix_expr_references(plan, (Node *) plan->targetlist);
fix_expr_references(plan, (Node *) plan->qual);
/* No need to recurse into the subplan, it's fixed already */
/* Recurse into subplan too */
set_plan_references(((SubqueryScan *) plan)->subplan);
break;
case T_NestLoop:
set_join_references((Join *) plan);
@ -132,6 +138,7 @@ set_plan_references(Plan *plan)
case T_Material:
case T_Sort:
case T_Unique:
case T_SetOp:
case T_Hash:
/*
@ -170,6 +177,7 @@ set_plan_references(Plan *plan)
* Append, like Sort et al, doesn't actually evaluate its
* targetlist or quals, and we haven't bothered to give it
* its own tlist copy. So, don't fix targetlist/qual.
* But do recurse into subplans.
*/
foreach(pl, ((Append *) plan)->appendplans)
set_plan_references((Plan *) lfirst(pl));