Fix bug in recent improvement to type resolution code. Forgot to retain

"best choice" type category when resolving UNKNOWN function and operator
 arguments. Thanks to Tom Lane for finding test case.

src/backend/parser/parse_func.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/parser/parse_func.c,v 1.92 2000/11/06 15:42:30 thomas Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/parser/parse_func.c,v 1.93 2000/11/11 19:49:26 thomas Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -951,6 +951,8 @@ func_select_candidate(int nargs,
 					/* started out as unknown type, so give preference to string type, if available */
 					if (current_category == STRING_TYPE)
 					{
+						slot_category = current_category;
+						slot_type = current_type;
 						/* forget all previous candidates */
 						candidates = current_candidate;
 						last_candidate = current_candidate;

src/backend/parser/parse_oper.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/parser/parse_oper.c,v 1.42 2000/11/07 16:01:01 thomas Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/parser/parse_oper.c,v 1.43 2000/11/11 19:49:26 thomas Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -435,6 +435,7 @@ oper_select_candidate(int nargs,
 				current_typeids = current_candidate->args;
 				current_type = current_typeids[i];
 				current_category = TypeCategory(current_type);
+				/* first time through? Then we'll use this one for now */
 				if (slot_category == INVALID_TYPE)
 				{
 					slot_category = current_category;
@@ -446,6 +447,8 @@ oper_select_candidate(int nargs,
 					/* started out as unknown type, so give preference to string type, if available */
 					if (current_category == STRING_TYPE)
 					{
+						slot_category = current_category;
+						slot_type = current_type;
 						/* forget all previous candidates */
 						candidates = current_candidate;
 						last_candidate = current_candidate;