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https://issues.apache.org/jira/browse/HIVE-25242?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Attila Magyar resolved HIVE-25242.
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Resolution: Fixed
> Query performs extremely slow with hive.vectorized.adaptor.usage.mode =
> chosen
> -------------------------------------------------------------------------------
>
> Key: HIVE-25242
> URL: https://issues.apache.org/jira/browse/HIVE-25242
> Project: Hive
> Issue Type: Bug
> Components: HiveServer2
> Affects Versions: 4.0.0
> Reporter: Attila Magyar
> Assignee: Attila Magyar
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> If hive.vectorized.adaptor.usage.mode is set to chosen only certain UDFS are
> vectorized through the vectorized adaptor.
> Queries like this one, performs very slowly because the concat is not chosen
> to be vectorized.
> {code:java}
> select count(*) from tbl where to_date(concat(year, '-', month, '-', day))
> between to_date('2018-12-01') and to_date('2021-03-01'); {code}
> The patch whitelists the concat udf so that it uses the vectorized adaptor in
> chosen mode.
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