manannan2017 opened a new issue #1570: the function of timediff has errors in 
boundary and type
URL: https://github.com/apache/incubator-doris/issues/1570
 
 
   the function of timediff has errors,such as boundary and type
   
   the list of errors is:
   1、select timediff(CAST('1944-02-25 00:00:00' as datetime), CAST('1944-2-26' 
as datetime));
   
+----------------------------------------------------------------------------------+
   | timediff(CAST('1944-02-25 00:00:00' AS DATETIME), CAST('1944-2-26' AS 
DATETIME)) |
   
+----------------------------------------------------------------------------------+
   | 00:00:00                                                                   
      |
   
+----------------------------------------------------------------------------------+
   except:
   
+----------------------------------------------------------------------------------+
   | timediff(CAST('1944-02-25 00:00:00' as datetime), CAST('1944-2-26' as 
datetime)) |
   
+----------------------------------------------------------------------------------+
   | -24:00:00                                                                  
      |
   
+----------------------------------------------------------------------------------+
   1 row in set (0.47 sec)
   
   2、boundary
   SELECT TIMEDIFF('2019-01-01 00:00:00', '2009-01-01 00:00:00');
   +--------------------------------------------------------+
   | timediff('2019-01-01 00:00:00', '2009-01-01 00:00:00') |
   +--------------------------------------------------------+
   | 87648:00:00                                            |
   +---------------------------
   except:
   SELECT TIMEDIFF('2019-01-01 00:00:00', '2009-01-01 00:00:00');
   +--------------------------------------------------------+
   | TIMEDIFF('2019-01-01 00:00:00', '2009-01-01 00:00:00') |
   +--------------------------------------------------------+
   | 838:59:59                                              |
   +--------------------------------------------------------+

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