fixes #927

Author: wumpz

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

@@ -1152,7 +1152,7 @@ String RelObjectName() :
 {    Token tk = null; String result = null; }
 {
     (result = RelObjectNameWithoutValue() | tk=<K_TOP> | tk=<K_VALUE> | tk=<K_VALUES> 
-        | tk=<K_INTERVAL> | tk=<K_START>)
+        | tk=<K_INTERVAL> | tk=<K_START> | tk=<K_ON>)
 
     { 
 		if (tk!=null) result=tk.image;
@@ -1182,7 +1182,7 @@ String RelObjectNameExt():
 {
     ( result=RelObjectName() | tk=<K_LEFT> | tk=<K_RIGHT> | tk=<K_SET> 
         | tk=<K_DOUBLE> | tk=<K_IF> | <K_OPTIMIZE> | tk=<K_LIMIT> 
-        | tk=<K_OFFSET>)
+        | tk=<K_OFFSET> )
     {
         if (tk!=null) result=tk.image;
         return result;
@@ -1296,7 +1296,7 @@ PlainSelect PlainSelect() #PlainSelect:
         |
             (
                 <K_DISTINCT> { Distinct distinct = new Distinct(); plainSelect.setDistinct(distinct); }
-                    [ "ON" "(" distinctOn=SelectItemsList()  { plainSelect.getDistinct().setOnSelectItems(distinctOn); } ")" ]
+                    [ LOOKAHEAD(2) "ON" "(" distinctOn=SelectItemsList()  { plainSelect.getDistinct().setOnSelectItems(distinctOn); } ")" ]
             )
         |
             (

src/test/java/net/sf/jsqlparser/statement/SetStatementTest.java

@@ -38,4 +38,9 @@ public void testIssue373_2() throws JSQLParserException {
     public void testMultiValue() throws JSQLParserException {
         assertSqlCanBeParsedAndDeparsed("SET v = 1, c = 3");
     }
+    
+    @Test
+    public void testValueOnIssue927() throws JSQLParserException {
+        assertSqlCanBeParsedAndDeparsed("SET standard_conforming_strings = on");
+    }
 }