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https://issues.apache.org/jira/browse/HIVE-24213?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on HIVE-24213 started by Zoltan Matyus.
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> Incorrect exception in the Merge MapJoinTask into its child MapRedTask
> optimizer
> --------------------------------------------------------------------------------
>
> Key: HIVE-24213
> URL: https://issues.apache.org/jira/browse/HIVE-24213
> Project: Hive
> Issue Type: Bug
> Components: Physical Optimizer
> Affects Versions: 4.0.0
> Reporter: Zoltan Matyus
> Assignee: Zoltan Matyus
> Priority: Minor
> Attachments: HIVE-24213.patch
>
>
> The {{CommonJoinTaskDispatcher#mergeMapJoinTaskIntoItsChildMapRedTask}}
> method throws a {{SemanticException}} if the number of {{FileSinkOperator}}s
> it finds is not exactly 1. The exception is valid if zero operators are
> found, but there can be valid use cases where multiple FileSinkOperators
> exist.
> Example: the MapJoin and it child are used in a common table expression,
> which is used for multiple inserts.
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