wangbo commented on issue #3008: Wrong answer for tableau generated SQL URL: https://github.com/apache/incubator-doris/issues/3008#issuecomment-595098011 **Bug Detail** The args of UDF ```ifnull``` current not support ```(date,datetime)``` or ```(datetime, date)``` When user uses ifnull with args ```(date,datetime)``` or ```(datetime, date)```,```Fe``` can't find a totally match Function,it will use ```ifnull(int,int)``` instead, then type cast happened, input args ```date``` or ```datetime``` will be cast to int,So the result is wrong. **Solution** Add new Args type ```(date,datetime)``` and ```(date,datetime)``` for ```ifull```. First, type cast will be avoid. Second, for ```Fe```,add new Args type won't affect UDF match logic. Third , ```Be``` treats date and datetime as the same type by default, so we needn't change ```Be``` logic
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