fixes #880

Author: wumpz

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

@@ -3902,4 +3902,9 @@ public void testSessionKeywordIssue876() throws JSQLParserException {
     public void testWindowClauseWithoutOrderByIssue869() throws JSQLParserException {
         assertSqlCanBeParsedAndDeparsed("SELECT subject_id, student_id, mark, sum(mark) OVER (PARTITION BY (subject_id) ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) FROM marks");
     }
+    
+    @Test
+    public void testKeywordSizeIssue880() throws JSQLParserException {
+        assertSqlCanBeParsedAndDeparsed("SELECT b.pattern_size_id, b.pattern_id, b.variation, b.measure_remark, b.pake_name, b.ident_size, CONCAT( GROUP_CONCAT(a.size) ) AS 'title', CONCAT( '[', GROUP_CONCAT( '{\"patternSizeDetailId\":', a.pattern_size_detail_id, ',\"patternSizeId\":', a.pattern_size_id, ',\"size\":\"', a.size, '\",\"sizeValue\":', a.size_value SEPARATOR '},' ), '}]' ) AS 'designPatternSizeDetailJson' FROM design_pattern_size_detail a LEFT JOIN design_pattern_size b ON a.pattern_size_id = b.pattern_size_id WHERE b.pattern_id = 792679713905573986 GROUP BY b.pake_name,b.pattern_size_id", true);
+    }
 }