fix for wrong QUARTER calculation in EXTRACT() (Bug #18100)

mysql-test/r/func_time.result:
  expected test results for bug #18100 added
mysql-test/t/func_time.test:
  test case for bug #18100 added
sql/item_timefunc.cc:
  wrong formula for EXTRACT QUARTER, now uses the same calculus as the QUARTER()
  function

mysql-test/r/func_time.result

@@ -360,6 +360,42 @@ extract(SECOND FROM "1999-01-02 10:11:12")
 select extract(MONTH FROM "2001-02-00");
 extract(MONTH FROM "2001-02-00")
 2
+SELECT EXTRACT(QUARTER FROM '2004-01-15') AS quarter;
+quarter
+1
+SELECT EXTRACT(QUARTER FROM '2004-02-15') AS quarter;
+quarter
+1
+SELECT EXTRACT(QUARTER FROM '2004-03-15') AS quarter;
+quarter
+1
+SELECT EXTRACT(QUARTER FROM '2004-04-15') AS quarter;
+quarter
+2
+SELECT EXTRACT(QUARTER FROM '2004-05-15') AS quarter;
+quarter
+2
+SELECT EXTRACT(QUARTER FROM '2004-06-15') AS quarter;
+quarter
+2
+SELECT EXTRACT(QUARTER FROM '2004-07-15') AS quarter;
+quarter
+3
+SELECT EXTRACT(QUARTER FROM '2004-08-15') AS quarter;
+quarter
+3
+SELECT EXTRACT(QUARTER FROM '2004-09-15') AS quarter;
+quarter
+3
+SELECT EXTRACT(QUARTER FROM '2004-10-15') AS quarter;
+quarter
+4
+SELECT EXTRACT(QUARTER FROM '2004-11-15') AS quarter;
+quarter
+4
+SELECT EXTRACT(QUARTER FROM '2004-12-15') AS quarter;
+quarter
+4
 SELECT "1900-01-01 00:00:00" + INTERVAL 2147483648 SECOND;
 "1900-01-01 00:00:00" + INTERVAL 2147483648 SECOND
 1968-01-20 03:14:08

mysql-test/t/func_time.test

@@ -139,6 +139,24 @@ select extract(MINUTE_SECOND FROM "10:11:12");
 select extract(SECOND FROM "1999-01-02 10:11:12");
 select extract(MONTH FROM "2001-02-00");
 
+#
+# test EXTRACT QUARTER (Bug #18100)
+#
+
+SELECT EXTRACT(QUARTER FROM '2004-01-15') AS quarter;
+SELECT EXTRACT(QUARTER FROM '2004-02-15') AS quarter;
+SELECT EXTRACT(QUARTER FROM '2004-03-15') AS quarter;
+SELECT EXTRACT(QUARTER FROM '2004-04-15') AS quarter;
+SELECT EXTRACT(QUARTER FROM '2004-05-15') AS quarter;
+SELECT EXTRACT(QUARTER FROM '2004-06-15') AS quarter;
+SELECT EXTRACT(QUARTER FROM '2004-07-15') AS quarter;
+SELECT EXTRACT(QUARTER FROM '2004-08-15') AS quarter;
+SELECT EXTRACT(QUARTER FROM '2004-09-15') AS quarter;
+SELECT EXTRACT(QUARTER FROM '2004-10-15') AS quarter;
+SELECT EXTRACT(QUARTER FROM '2004-11-15') AS quarter;
+SELECT EXTRACT(QUARTER FROM '2004-12-15') AS quarter;
+
+
 #
 # Test big intervals (Bug #3498)
 #

sql/item_timefunc.cc

@@ -2213,7 +2213,7 @@ longlong Item_extract::val_int()
   switch (int_type) {
   case INTERVAL_YEAR:		return ltime.year;
   case INTERVAL_YEAR_MONTH:	return ltime.year*100L+ltime.month;
-  case INTERVAL_QUARTER:	return ltime.month/3 + 1;
+  case INTERVAL_QUARTER:	return (ltime.month+2)/3;
   case INTERVAL_MONTH:		return ltime.month;
   case INTERVAL_WEEK:
   {