Reminiscent opened a new pull request, #20132: URL: https://github.com/apache/doris/pull/20132
# Proposed changes Before this PR ``` mysql> select * from (select 1 as a, 2 as b union all select 3, 3) t where a = 1; +------+------+ | a | b | +------+------+ | 1 | 2 | | 3 | 3 | +------+------+ 2 rows in set (0.01 sec) ``` After this PR ``` mysql> select * from (select 1 as a, 2 as b union all select 3, 3) t where a = 1; +------+------+ | a | b | +------+------+ | 1 | 2 | +------+------+ 1 row in set (0.38 sec) ``` ## Problem summary When we want to push the filter through the union. We should check whether the union's children are `OneRowRelation` or not. If there are some `OneRowRelation`, we shouldn't push down the filter to that part ## Checklist(Required) * [ ] Does it affect the original behavior * [ ] Has unit tests been added * [ ] Has document been added or modified * [ ] Does it need to update dependencies * [ ] Is this PR support rollback (If NO, please explain WHY) ## Further comments If this is a relatively large or complex change, kick off the discussion at [d...@doris.apache.org](mailto:d...@doris.apache.org) by explaining why you chose the solution you did and what alternatives you considered, etc... -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For additional commands, e-mail: commits-h...@doris.apache.org
