chenhao7253886 opened a new issue #1493: ifnull return wrong type value in 
aggregation function
URL: https://github.com/apache/incubator-doris/issues/1493
 
 
   The following query:
   mysql> select sum(ifnull(0.0,0)) from baseall';
   ERROR 1064 (HY000): SUM requires a numeric parameter: sum(ifnull('0.0', 0))
   the root reason is that we does't support decimal's  sum. i will improve it.

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