EmmyMiao87 opened a new pull request #2087: Add the cast function for if 
function in outer join
URL: https://github.com/apache/incubator-doris/pull/2087
 
 
   The type of function which is different from the type of expr will return 
the incorrect result in query.
   
   Example:
     the type of expr is date
     the type of function is int
     So, the upper fragment will receive a int value instead of date while the 
result expr is date.
     If there is no cast function, the result of query will be incorrect.

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