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https://issues.apache.org/jira/browse/HIVE-8225?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sergey Shelukhin updated HIVE-8225:
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Attachment: HIVE-8225.inprogress.patch
small update. judging by debug logging the fixup is simply never called even
though aggregates that are lost are of the same pattern, probably need to do it
separately in ASTConverter after derived table stuff, I just put it there by
accident because i had some debug logging there
> CBO trunk merge: union11 test fails due to incorrect plan
> ---------------------------------------------------------
>
> Key: HIVE-8225
> URL: https://issues.apache.org/jira/browse/HIVE-8225
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Attachments: HIVE-8225.inprogress.patch, HIVE-8225.inprogress.patch
>
>
> The result changes to as if the union didn't have count() inside. The issue
> can be fixed by using srcunion.value outside the subquery in count (replace
> count(1) with count(srcunion.value)). Otherwise, it looks like count(1) node
> from union-ed queries is not present in AST at all, which might cause this
> result.
> -Interestingly, adding group by to each query in a union produces completely
> weird result (count(1) is 309 for each key, whereas it should be 1 and the
> "logical" incorrect value if internal count is lost is 500)- Nm, that groups
> by table column called key, which is weird but is what Hive does
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