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https://issues.apache.org/jira/browse/HIVE-11171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14616572#comment-14616572
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Jesus Camacho Rodriguez commented on HIVE-11171:
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Changes in q files LGTM.
All of them are join input swaps, resulting in removal of Select operator on
top of the join. Further, in some cases multijoin merge is triggered where it
was not triggered before e.g. join_merging.q.
> Join reordering algorithm might introduce projects between joins
> ----------------------------------------------------------------
>
> Key: HIVE-11171
> URL: https://issues.apache.org/jira/browse/HIVE-11171
> Project: Hive
> Issue Type: Bug
> Components: CBO
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Attachments: HIVE-11171.01.patch, HIVE-11171.02.patch,
> HIVE-11171.03.patch, HIVE-11171.5.patch, HIVE-11171.patch, HIVE-11171.patch
>
>
> Join reordering algorithm might introduce projects between joins which causes
> multijoin optimization in SemanticAnalyzer to not kick in.
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