Enable more flexible syntax for the SET command. Now allows single floats,

 single integers, and lists of names, without surrounding them with quotes.
Remove all tokens which are defined as operators from ColID and ColLabel
 to avoid precedence confusion. Thanks to Tom Lane for catching this.

Author: Thomas G. Lockhart

src/backend/parser/gram.y

@@ -11,7 +11,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.164 2000/03/27 17:12:06 thomas Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.165 2000/03/30 06:02:36 thomas Exp $
  *
  * HISTORY
  *	  AUTHOR			DATE			MAJOR EVENT
@@ -297,7 +297,8 @@ static void doNegateFloat(Value *v);
 		COALESCE, COLLATE, COLUMN, COMMIT,
 		CONSTRAINT, CONSTRAINTS, CREATE, CROSS, CURRENT, CURRENT_DATE,
 		CURRENT_TIME, CURRENT_TIMESTAMP, CURRENT_USER, CURSOR,
-		DAY_P, DEC, DECIMAL, DECLARE, DEFAULT, DELETE, DESC, DISTINCT, DOUBLE, DROP,
+		DAY_P, DEC, DECIMAL, DECLARE, DEFAULT, DELETE, DESC,
+		DISTINCT, DOUBLE, DROP,
 		ELSE, END_TRANS, EXCEPT, EXECUTE, EXISTS, EXTRACT,
 		FALSE_P, FETCH, FLOAT, FOR, FOREIGN, FROM, FULL,
 		GLOBAL, GRANT, GROUP, HAVING, HOUR_P,
@@ -712,8 +713,71 @@ opt_level:  READ COMMITTED					{ $$ = "committed"; }
 		| SERIALIZABLE						{ $$ = "serializable"; }
 		;
 
-var_value:  Sconst			{ $$ = $1; }
-		| DEFAULT			{ $$ = NULL; }
+var_value:  Sconst
+				{
+					/* Plain old string (pointer to char) */
+					$$ = $1;
+				}
+		| FCONST
+				{
+					/* Floating pumeric argument?
+					 * This recently changed to preserve "stringiness" until here,
+					 * so we don't have any work to do at all. Nice.
+					 * - thomas 2000-03-29
+					 */
+					$$ = $1;
+				}
+		| Iconst
+				{
+					char   *result;
+					char	buf[64];
+
+					/* Integer pumeric argument?
+					 */
+					if (sprintf(buf, "%d", $1) != 1)
+					{
+						result = pstrdup(buf);
+					}
+					else
+						elog(ERROR, "Unable to convert constant to string (internal error)");
+
+					$$ = result;
+				}
+		| name_list
+				{
+					List *n;
+					int llen, slen = 0;
+					char *result;
+
+					llen = length($1);
+
+					/* List of words? Then concatenate together */
+					if (llen < 1)
+						elog(ERROR, "SET must have at least one argument");
+
+					foreach (n, $1)
+					{
+						Value *p = (Value *) lfirst(n);
+						Assert(IsA(p, String));
+						/* keep track of room for string and trailing comma */
+						slen += (strlen(p->val.str) + 1);
+					}
+					result = palloc(slen + 1);
+					*result = '\0';
+					foreach (n, $1)
+					{
+						Value *p = (Value *) lfirst(n);
+						strcat(result, p->val.str);
+						strcat(result, ",");
+					}
+					/* remove the trailing comma from the last element */
+					*(result+strlen(result)-1) = '\0';
+					$$ = result;
+				}
+		| DEFAULT
+				{
+					$$ = NULL;
+				}
 		;
 
 zone_value:  Sconst			{ $$ = $1; }
@@ -1609,9 +1673,9 @@ TriggerFuncArgs:  TriggerFuncArg
 
 TriggerFuncArg:  ICONST
 				{
-					char *s = (char *) palloc(64);
-					sprintf (s, "%d", $1);
-					$$ = s;
+					char buf[64];
+					sprintf (buf, "%d", $1);
+					$$ = pstrdup(buf);
 				}
 			| FCONST						{  $$ = $1; }
 			| Sconst						{  $$ = $1; }
@@ -3396,7 +3460,7 @@ opt_select_limit:	LIMIT select_limit_value ',' select_offset_value
 			{ $$ = lappend(lappend(NIL, NULL), NULL); }
 		;
 
-select_limit_value:		Iconst
+select_limit_value:  Iconst
 			{
 				Const	*n = makeNode(Const);
 
@@ -5236,6 +5300,15 @@ UserId:  IDENT							{ $$ = $1; };
  *  some of these keywords will have to be removed from this
  *  list due to shift/reduce conflicts in yacc. If so, move
  *  down to the ColLabel entity. - thomas 1997-11-06
+ * These show up as operators, ans will screw up the parsing if
+ * allowed as identifiers or labels.
+ * Thanks to Tom Lane for pointing this out. - thomas 2000-03-29
+		| BETWEEN						{ $$ = "between"; }
+		| IN							{ $$ = "in"; }
+		| IS							{ $$ = "is"; }
+		| ISNULL						{ $$ = "isnull"; }
+		| NOTNULL						{ $$ = "notnull"; }
+		| OVERLAPS						{ $$ = "overlaps"; }
  */
 ColId:  IDENT							{ $$ = $1; }
 		| datetime						{ $$ = $1; }
@@ -5249,7 +5322,6 @@ ColId:  IDENT							{ $$ = $1; }
 		| BACKWARD						{ $$ = "backward"; }
 		| BEFORE						{ $$ = "before"; }
 		| BEGIN_TRANS					{ $$ = "begin"; }
-		| BETWEEN						{ $$ = "between"; }
 		| BY							{ $$ = "by"; }
 		| CACHE							{ $$ = "cache"; }
 		| CASCADE						{ $$ = "cascade"; }
@@ -5281,16 +5353,13 @@ ColId:  IDENT							{ $$ = $1; }
 		| GRANT							{ $$ = "grant"; }
 		| HANDLER						{ $$ = "handler"; }
 		| IMMEDIATE						{ $$ = "immediate"; }
-		| IN							{ $$ = "in"; }
 		| INCREMENT						{ $$ = "increment"; }
 		| INDEX							{ $$ = "index"; }
 		| INHERITS						{ $$ = "inherits"; }
 		| INSENSITIVE					{ $$ = "insensitive"; }
 		| INSERT						{ $$ = "insert"; }
 		| INSTEAD						{ $$ = "instead"; }
 		| INTERVAL						{ $$ = "interval"; }
-		| IS							{ $$ = "is"; }
-		| ISNULL						{ $$ = "isnull"; }
 		| ISOLATION						{ $$ = "isolation"; }
 		| KEY							{ $$ = "key"; }
 		| LANGUAGE						{ $$ = "language"; }
@@ -5309,13 +5378,11 @@ ColId:  IDENT							{ $$ = $1; }
 		| NOCREATEUSER					{ $$ = "nocreateuser"; }
 		| NOTHING						{ $$ = "nothing"; }
 		| NOTIFY						{ $$ = "notify"; }
-		| NOTNULL						{ $$ = "notnull"; }
 		| OF							{ $$ = "of"; }
 		| OIDS							{ $$ = "oids"; }
 		| ONLY							{ $$ = "only"; }
 		| OPERATOR						{ $$ = "operator"; }
 		| OPTION						{ $$ = "option"; }
-		| OVERLAPS						{ $$ = "overlaps"; }
 		| PARTIAL						{ $$ = "partial"; }
 		| PASSWORD						{ $$ = "password"; }
 		| PENDANT						{ $$ = "pendant"; }
@@ -5375,12 +5442,23 @@ ColId:  IDENT							{ $$ = $1; }
  * Add other keywords to this list. Note that they appear here
  *  rather than in ColId if there was a shift/reduce conflict
  *  when used as a full identifier. - thomas 1997-11-06
+ * These show up as operators, ans will screw up the parsing if
+ * allowed as identifiers or labels.
+ * Thanks to Tom Lane for pointing this out. - thomas 2000-03-29
+		| ALL							{ $$ = "all"; }
+		| ANY							{ $$ = "any"; }
+		| EXCEPT						{ $$ = "except"; }
+		| INTERSECT						{ $$ = "intersect"; }
+		| LIKE							{ $$ = "like"; }
+		| NOT							{ $$ = "not"; }
+		| NULLIF						{ $$ = "nullif"; }
+		| NULL_P						{ $$ = "null_p"; }
+		| OR							{ $$ = "or"; }
+		| UNION							{ $$ = "union"; }
  */
 ColLabel:  ColId						{ $$ = $1; }
 		| ABORT_TRANS					{ $$ = "abort"; }
-		| ALL							{ $$ = "all"; }
 		| ANALYZE						{ $$ = "analyze"; }
-		| ANY							{ $$ = "any"; }
 		| ASC							{ $$ = "asc"; }
 		| BINARY						{ $$ = "binary"; }
 		| BIT							{ $$ = "bit"; }
@@ -5411,7 +5489,6 @@ ColLabel:  ColId						{ $$ = $1; }
 		| DO							{ $$ = "do"; }
 		| ELSE							{ $$ = "else"; }
 		| END_TRANS						{ $$ = "end"; }
-		| EXCEPT						{ $$ = "except"; }
 		| EXISTS						{ $$ = "exists"; }
 		| EXPLAIN						{ $$ = "explain"; }
 		| EXTEND						{ $$ = "extend"; }
@@ -5427,12 +5504,10 @@ ColLabel:  ColId						{ $$ = $1; }
 		| HAVING						{ $$ = "having"; }
 		| INITIALLY						{ $$ = "initially"; }
 		| INNER_P						{ $$ = "inner"; }
-		| INTERSECT						{ $$ = "intersect"; }
 		| INTO							{ $$ = "into"; }
 		| JOIN							{ $$ = "join"; }
 		| LEADING						{ $$ = "leading"; }
 		| LEFT							{ $$ = "left"; }
-		| LIKE							{ $$ = "like"; }
 		| LISTEN						{ $$ = "listen"; }
 		| LOAD							{ $$ = "load"; }
 		| LOCAL							{ $$ = "local"; }
@@ -5442,13 +5517,9 @@ ColLabel:  ColId						{ $$ = $1; }
 		| NCHAR							{ $$ = "nchar"; }
 		| NEW							{ $$ = "new"; }
 		| NONE							{ $$ = "none"; }
-		| NOT							{ $$ = "not"; }
-		| NULLIF						{ $$ = "nullif"; }
-		| NULL_P						{ $$ = "null_p"; }
 		| NUMERIC						{ $$ = "numeric"; }
 		| OFFSET						{ $$ = "offset"; }
 		| ON							{ $$ = "on"; }
-		| OR							{ $$ = "or"; }
 		| ORDER							{ $$ = "order"; }
 		| OUTER_P						{ $$ = "outer"; }
 		| POSITION						{ $$ = "position"; }
@@ -5470,7 +5541,6 @@ ColLabel:  ColId						{ $$ = $1; }
 		| TRANSACTION					{ $$ = "transaction"; }
 		| TRIM							{ $$ = "trim"; }
 		| TRUE_P						{ $$ = "true"; }
-		| UNION							{ $$ = "union"; }
 		| UNIQUE						{ $$ = "unique"; }
 		| USER							{ $$ = "user"; }
 		| USING							{ $$ = "using"; }