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https://issues.apache.org/jira/browse/HIVE-25042?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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mahesh kumar behera updated HIVE-25042:
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Parent: (was: HIVE-24883)
Issue Type: Bug (was: Sub-task)
> Add support for map data type in Common merge join and SMB Join
> ---------------------------------------------------------------
>
> Key: HIVE-25042
> URL: https://issues.apache.org/jira/browse/HIVE-25042
> Project: Hive
> Issue Type: Bug
> Components: Hive, HiveServer2
> Reporter: mahesh kumar behera
> Priority: Major
>
> Merge join results depends on the underlying sorter used by the mapper task
> as we need to judge the direction after each key comparison. So the
> comparison done during join has to match the way the records are sorted by
> the mapper. As per the sorter used by mapper task (PipelinedSorter),
> hash-maps with same key-value pair in different order are not equal. So the
> merge join also behaves the same way. But map join treats them as equal. We
> have to modify the pipelined sorter code to handle the map datatype. Then
> support has to be added in the Join code to support map types.
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