Add support for Case exprs to fix_indxqual_references,

so that Case works in WHERE join clauses.  Temporary patch --- this routine
is one of many that ought to be changed to use centralized expression-tree-
walking logic.

diff --git a/src/backend/optimizer/plan/createplan.c b/src/backend/optimizer/plan/createplan.c
index 18837cf2824095c1fd29a6800648c1677f5fc5ac..a358308a46898a58e585abe65c92e647a9f3936a 100644 (file)
--- a/src/backend/optimizer/plan/createplan.c
+++ b/src/backend/optimizer/plan/createplan.c
@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *   $Header: /cvsroot/pgsql/src/backend/optimizer/plan/createplan.c,v 1.64 1999/07/27 03:51:03 tgl Exp $
+ *   $Header: /cvsroot/pgsql/src/backend/optimizer/plan/createplan.c,v 1.65 1999/07/29 02:48:05 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -740,6 +740,37 @@ fix_indxqual_references(Node *clause, Path *index_path)
 
        return (Node *) newnode;
    }
+   else if (IsA(clause, CaseExpr))
+   {
+       CaseExpr   *oldnode = (CaseExpr *) clause;
+       CaseExpr   *newnode = makeNode(CaseExpr);
+
+       newnode->casetype = oldnode->casetype;
+       newnode->arg = oldnode->arg;    /* XXX should always be null
+                                        * anyway ... */
+       newnode->args = (List *)
+           fix_indxqual_references((Node *) oldnode->args,
+                                   index_path);
+       newnode->defresult =
+           fix_indxqual_references(oldnode->defresult,
+                                   index_path);
+
+       return (Node *) newnode;
+   }
+   else if (IsA(clause, CaseWhen))
+   {
+       CaseWhen   *oldnode = (CaseWhen *) clause;
+       CaseWhen   *newnode = makeNode(CaseWhen);
+
+       newnode->expr =
+           fix_indxqual_references(oldnode->expr,
+                                   index_path);
+       newnode->result =
+           fix_indxqual_references(oldnode->result,
+                                   index_path);
+
+       return (Node *) newnode;
+   }
    else
    {
        elog(ERROR, "fix_indxqual_references: Cannot handle node type %d",