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https://issues.apache.org/jira/browse/HIVE-3996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13580429#comment-13580429
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Namit Jain commented on HIVE-3996:
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Also, the new results for union22.q are wrong.
What is the problem ?
Essentially, in the current code, the nocondtionaltask is not enforced for a
sub-query.
> Correctly enforce the memory limit on the multi-table map-join
> --------------------------------------------------------------
>
> Key: HIVE-3996
> URL: https://issues.apache.org/jira/browse/HIVE-3996
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Affects Versions: 0.11.0
> Reporter: Vikram Dixit K
> Assignee: Vikram Dixit K
> Attachments: HIVE-3996_2.patch, HIVE-3996.patch
>
>
> Currently with HIVE-3784, the joins are converted to map-joins based on
> checks of the table size against the config variable:
> hive.auto.convert.join.noconditionaltask.size.
> However, the current implementation will also merge multiple mapjoin
> operators into a single task regardless of whether the sum of the table sizes
> will exceed the configured value.
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