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https://issues.apache.org/jira/browse/HIVE-28549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17939956#comment-17939956
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Denys Kuzmenko commented on HIVE-28549:
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Merged to master
Thanks for the fix, [~okumin] and [~seonggon] for the review!
> Limit the maximum number of operators merged by SharedWorkOptimizer
> -------------------------------------------------------------------
>
> Key: HIVE-28549
> URL: https://issues.apache.org/jira/browse/HIVE-28549
> Project: Hive
> Issue Type: Sub-task
> Components: Physical Optimizer
> Affects Versions: 4.0.0
> Reporter: Shohei Okumiya
> Assignee: Shohei Okumiya
> Priority: Major
> Labels: pull-request-available
>
> Currently, SharedWorkOptimizer can merge as many number of operator trees as
> possible. This unbounded optimization can push memory pressure to a task, or
> can cause performance problems because a single vertex has to process many
> operations.
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