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https://issues.apache.org/jira/browse/HIVE-20744?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16682010#comment-16682010
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Ashutosh Chauhan commented on HIVE-20744:
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+1
> Use SQL constraints to improve join reordering algorithm
> --------------------------------------------------------
>
> Key: HIVE-20744
> URL: https://issues.apache.org/jira/browse/HIVE-20744
> Project: Hive
> Issue Type: Bug
> Components: CBO
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Priority: Major
> Attachments: HIVE-20744.01.patch, HIVE-20744.02.patch,
> HIVE-20744.03.patch, HIVE-20744.04.patch, HIVE-20744.05.patch,
> HIVE-20744.patch
>
>
> Till now, it was all based on stats stored for the base tables and their
> columns. Now the optimizer can rely on constraints. Hence, this patch is for
> the join reordering costing to use constraints, and if it does not find any,
> rely on old code path.
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