fixes #620

Author: wumpz

src/main/java/net/sf/jsqlparser/util/deparser/SelectDeParser.java

@@ -283,7 +283,7 @@ public void deparseOffset(Offset offset) {
         // or OFFSET offset (ROW | ROWS)
         if (offset.getOffsetJdbcParameter() != null) {
             buffer.append(" OFFSET ").append(offset.getOffsetJdbcParameter());
-        } else if (offset.getOffset() != 0) {
+        } else {
             buffer.append(" OFFSET ");
             buffer.append(offset.getOffset());
         }

src/test/java/net/sf/jsqlparser/statement/select/SelectTest.java

@@ -3171,4 +3171,10 @@ public void testNestedCast() throws JSQLParserException {
     public void testNamedParametersIssue612() throws Exception {
         assertSqlCanBeParsedAndDeparsed( "SELECT a FROM b LIMIT 10 OFFSET :param");
     }
+    
+    @Test
+    public void testMissingOffsetIssue620() throws JSQLParserException {
+        assertSqlCanBeParsedAndDeparsed("SELECT a, b FROM test OFFSET 0");
+        assertSqlCanBeParsedAndDeparsed("SELECT a, b FROM test LIMIT 1 OFFSET 0");
+    }
 }