[GitHub] [incubator-doris] ccoffline commented on issue #4772: [Bug] UNION ALL query return wrong empty set

[GitBox <gi...@apache.org>]

ccoffline commented on issue #4772:
URL: https://github.com/apache/incubator-doris/issues/4772#issuecomment-714904742


   This is most likely because Doris treats UNION clause conditions as conditions for the entire previous query.
   Test result on `MySQL 5.7` shows that these two queries return the same result.
   I haven't found any description of union queries like this in the SQL standard, but I think Doris should keep the same actions as `MySQL`.


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