[jira] [Updated] (HIVE-5868) Add statistics rule for Union operator

["Harish Butani (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-5868?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Harish Butani updated HIVE-5868:
--------------------------------

    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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