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https://issues.apache.org/jira/browse/HIVE-3544?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kevin Wilfong updated HIVE-3544:
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Attachment: HIVE-3544.2.patch.txt
> union involving double column with a map join subquery will fail or give
> wrong results
> --------------------------------------------------------------------------------------
>
> Key: HIVE-3544
> URL: https://issues.apache.org/jira/browse/HIVE-3544
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.10.0
> Reporter: Kevin Wilfong
> Assignee: Kevin Wilfong
> Attachments: HIVE-3544.1.patch.txt, HIVE-3544.2.patch.txt
>
>
> The following query fails:
> select * from (select cast(a.key as bigint) as key from src a join src b on
> a.key = b.key union all select cast(key as double) as key from src)a
> The following query gives wrong results:
> select * from (select cast(a.key as bigint) as key, cast(b.key as double) as
> value from src a join src b on a.key = b.key union all select cast(key as
> double) as key, cast(key as string) as value from src)a
> But the following query runs fine:
> select * from (select cast(a.key as bigint) as key from src a union all
> select cast(key as double) as key from src)a
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