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https://issues.apache.org/jira/browse/HIVE-2901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13247829#comment-13247829
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Phabricator commented on HIVE-2901:
-----------------------------------
njain has accepted the revision "HIVE-2901 [jira] Hive union with NULL constant
and string in same column returns all null".
REVISION DETAIL
https://reviews.facebook.net/D2541
BRANCH
DPAL-1029
> Hive union with NULL constant and string in same column returns all null
> ------------------------------------------------------------------------
>
> Key: HIVE-2901
> URL: https://issues.apache.org/jira/browse/HIVE-2901
> Project: Hive
> Issue Type: Bug
> Reporter: Kevin Wilfong
> Assignee: Navis
> Priority: Critical
> Attachments: HIVE-2901.D2541.1.patch, HIVE-2901.D2541.2.patch,
> HIVE-2901.D2541.3.patch
>
>
> select x from (select value as x from src union all select NULL as x from
> src)a;
> This query produces all nulls, where value is a string column.
> Notably,
> select x from (select key as x from src union all select NULL as x from src)a;
> where key is a string, but can be cast to a double, the query returns correct
> results.
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