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https://issues.apache.org/jira/browse/HIVE-23976?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17192691#comment-17192691
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László Bodor commented on HIVE-23976:
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[~zabetak]: thanks for taking a look. I think we should go the latter way, as
we don't have n-ary vectorized expressions. It used to be a performance
decision + now the descriptors don't let us match expression on an "arbitrary"
number of input arguments.
> Enable vectorization for multi-col semi join reducers
> -----------------------------------------------------
>
> Key: HIVE-23976
> URL: https://issues.apache.org/jira/browse/HIVE-23976
> Project: Hive
> Issue Type: Improvement
> Reporter: Stamatis Zampetakis
> Assignee: László Bodor
> Priority: Major
> Labels: pull-request-available
> Time Spent: 20m
> Remaining Estimate: 0h
>
> HIVE-21196 introduces multi-column semi-join reducers in the query engine.
> However, the implementation relies on GenericUDFMurmurHash which is not
> vectorized thus the respective operators cannot be executed in vectorized
> mode.
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