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https://issues.apache.org/jira/browse/HIVE-11919?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Laljo John Pullokkaran updated HIVE-11919:
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Attachment: HIVE-11919.1.patch
> Hive Union Type Mismatch
> ------------------------
>
> Key: HIVE-11919
> URL: https://issues.apache.org/jira/browse/HIVE-11919
> Project: Hive
> Issue Type: Bug
> Reporter: Laljo John Pullokkaran
> Assignee: Laljo John Pullokkaran
> Attachments: HIVE-11919.1.patch
>
>
> In Hive for union right most type wins out for most primitive types during
> plan gen. However when union op gets initialized the type gets switched.
> This could result in bad data & type exceptions.
> This happens only in non cbo mode.
> In CBO mode, Hive would add explicit type casts that would prevent such type
> issues.
> Sample Query:
> select cd/sum(cd) over() from(select cd from u1 union all select cd from u2
> union all select cd from u3)u4;
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