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https://issues.apache.org/jira/browse/HIVE-16182?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gopal V updated HIVE-16182:
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Attachment: HIVE-16182.1.patch
> Semijoin: Avoid VectorHashKeyWrapper allocations for the bloom hash aggregate
> -----------------------------------------------------------------------------
>
> Key: HIVE-16182
> URL: https://issues.apache.org/jira/browse/HIVE-16182
> Project: Hive
> Issue Type: Improvement
> Components: Vectorization
> Affects Versions: 2.2.0
> Reporter: Gopal V
> Attachments: HIVE-16182.1.patch
>
>
> To avoid GC spam during the hash aggregate part of the bloom filter, the key
> for the semijoin can be special-cased as an immutable empty key.
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