Seaven removed a comment on issue #2123: If the parameter of ifnull is datetime, return wrong type URL: https://github.com/apache/incubator-doris/issues/2123#issuecomment-552782707 There are several reasons for the question： 1.The ifnull method does not support check for date type 2.If the parameter type of ifnull method is different, maybe will return unpredictable result, such as ifnull(b.k10, b.k9), ifnull(b.k10, b.k11).....
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