corrected lookahead

Author: wumpz

src/main/jjtree/net/sf/jsqlparser/parser/JSqlParserCC.jjt

@@ -1195,12 +1195,12 @@ Join JoinerExpression():
         right=FromItem()
 
 
-    [ LOOKAHEAD(2)
-		( <K_ON> onExpression=Expression()  { join.setOnExpression(onExpression); } )
+    [ 
+	LOOKAHEAD(2) (( <K_ON> onExpression=Expression()  { join.setOnExpression(onExpression); } )
 		|
 		( <K_USING> "(" tableColumn=Column() { columns = new ArrayList(); columns.add(tableColumn); }
 				("," tableColumn=Column() { columns.add(tableColumn); } )* ")"
-		  { join.setUsingColumns(columns); }   )
+		  { join.setUsingColumns(columns); }   ))
   	]
   {
   	join.setRightItem(right);