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https://issues.apache.org/jira/browse/HIVE-8655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14188965#comment-14188965
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Sergey Shelukhin commented on HIVE-8655:
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tez_union_decimal
> CBO: ppr_pushdown, udf_substr produces incorrect results due to broken
> tablesample handling
> -------------------------------------------------------------------------------------------
>
> Key: HIVE-8655
> URL: https://issues.apache.org/jira/browse/HIVE-8655
> Project: Hive
> Issue Type: Sub-task
> Components: CBO
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Fix For: 0.15.0
>
>
> Bunch of rows were added. Looks like tablesample in subquery is no longer
> blocking CBO, probably broken by HIVE-8021
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