Recent changes in sublink representation require exprType() to accept

SubPlan nodes, else explaining queries containing sublinks may fail.

src/backend/parser/parse_expr.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/parser/parse_expr.c,v 1.140 2003/01/10 21:08:15 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/parser/parse_expr.c,v 1.141 2003/01/13 00:18:51 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -20,6 +20,7 @@
 #include "miscadmin.h"
 #include "nodes/makefuncs.h"
 #include "nodes/params.h"
+#include "nodes/plannodes.h"
 #include "parser/analyze.h"
 #include "parser/gramparse.h"
 #include "parser/parse.h"
@@ -962,6 +963,7 @@ exprType(Node *expr)
 						elog(ERROR, "exprType: Cannot get type for untransformed sublink");
 					tent = (TargetEntry *) lfirst(qtree->targetList);
 					Assert(IsA(tent, TargetEntry));
+					Assert(!tent->resdom->resjunk);
 					type = tent->resdom->restype;
 				}
 				else
@@ -971,6 +973,32 @@ exprType(Node *expr)
 				}
 			}
 			break;
+		case T_SubPlan:
+			{
+				/*
+				 * Although the parser does not ever deal with already-planned
+				 * expression trees, we support SubPlan nodes in this routine
+				 * for the convenience of ruleutils.c.
+				 */
+				SubPlan    *subplan = (SubPlan *) expr;
+
+				if (subplan->subLinkType == EXPR_SUBLINK)
+				{
+					/* get the type of the subselect's first target column */
+					TargetEntry *tent;
+
+					tent = (TargetEntry *) lfirst(subplan->plan->targetlist);
+					Assert(IsA(tent, TargetEntry));
+					Assert(!tent->resdom->resjunk);
+					type = tent->resdom->restype;
+				}
+				else
+				{
+					/* for all other subplan types, result is boolean */
+					type = BOOLOID;
+				}
+			}
+			break;
 		case T_FieldSelect:
 			type = ((FieldSelect *) expr)->resulttype;
 			break;