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https://issues.apache.org/jira/browse/HIVE-28853?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HIVE-28853:
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Labels: pull-request-available (was: )
> SharedWorkOptimizer does not consider MapJoin operators' InMemoryDataSize in
> certain code paths.
> ------------------------------------------------------------------------------------------------
>
> Key: HIVE-28853
> URL: https://issues.apache.org/jira/browse/HIVE-28853
> Project: Hive
> Issue Type: Bug
> Reporter: Seonggon Namgung
> Assignee: Seonggon Namgung
> Priority: Major
> Labels: pull-request-available
>
> To prevent excessive MapJoin HashTable usage, SharedWorkOptimizer checks the
> total InMemoryDataSize, including both merged and unmerged MapJoins that
> belong to the same vertex, before proceeding to merge step. However, the
> current implementation skips this check when merging only a pair of TS or a
> pair of TS-FIL. This omission can lead to performance degradation due to
> loading large HashTables.
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