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https://issues.apache.org/jira/browse/HIVE-5868?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Harish Butani updated HIVE-5868:
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Fix Version/s: (was: 0.13.0)
0.14.0
> Add statistics rule for Union operator
> --------------------------------------
>
> Key: HIVE-5868
> URL: https://issues.apache.org/jira/browse/HIVE-5868
> Project: Hive
> Issue Type: Sub-task
> Components: Query Processor, Statistics
> Affects Versions: 0.13.0
> Reporter: Prasanth J
> Assignee: Prasanth J
> Fix For: 0.14.0
>
>
> At this point union operator uses the default statistics rule which will
> merge the statistics from its parent operators. The default rule does not
> assign the output table alias to each of the column statistics. This will
> result in incorrectly fetching column statistics when statistics of union
> operator is referenced further down the operator tree. A new rule for union
> operator should be added which should merge column statistics properly and
> rename the column names based on output row schema of union operator.
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