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Add support for the CASE statement in the rewrite handling.

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Allows (at least some) rules and views.
Still some trouble (crashes) with target CASE columns spanning tables,
 but lots now works.
This commit is contained in:
Thomas G. Lockhart
1998-12-14 00:02:17 +00:00
parent 2b189aa953
commit 4140c2f30e
6 changed files with 250 additions and 13 deletions
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31
src/backend/optimizer/plan/setrefs.c
View File

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/setrefs.c,v 1.28 1998/10/08 18:29:29 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/setrefs.c,v 1.29 1998/12/14 00:02:10 thomas Exp $
*
*-------------------------------------------------------------------------
*/
@ -303,7 +303,7 @@ replace_clause_joinvar_refs(Expr *clause,
{
temp = (List *) replace_joinvar_refs((Var *) clause,
outer_tlist, inner_tlist);
if (temp)
if (temp != NULL)
return temp;
else if (clause != NULL)
return (List *) clause;
@ -402,6 +402,33 @@ replace_clause_joinvar_refs(Expr *clause,
inner_tlist);
return (List *) clause;
}
else if (IsA(clause, CaseExpr))
{
((CaseExpr *) clause)->args =
(List *) replace_subclause_joinvar_refs(((CaseExpr *) clause)->args,
outer_tlist,
inner_tlist);
((CaseExpr *) clause)->defresult =
(Node *) replace_clause_joinvar_refs((Expr *) ((CaseExpr *) clause)->defresult,
outer_tlist,
inner_tlist);
return (List *) clause;
}
else if (IsA(clause, CaseWhen))
{
((CaseWhen *) clause)->expr =
(Node *) replace_clause_joinvar_refs((Expr *) ((CaseWhen *) clause)->expr,
outer_tlist,
inner_tlist);
((CaseWhen *) clause)->result =
(Node *) replace_clause_joinvar_refs((Expr *) ((CaseWhen *) clause)->result,
outer_tlist,
inner_tlist);
return (List *) clause;
}
/* shouldn't reach here */
elog(ERROR, "replace_clause_joinvar_refs: unsupported clause %d",
nodeTag(clause));