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https://issues.apache.org/jira/browse/HIVE-23730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17160857#comment-17160857
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Jesus Camacho Rodriguez commented on HIVE-23730:
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+1
> Compiler support tracking TS keyColName for Probe MapJoin
> ---------------------------------------------------------
>
> Key: HIVE-23730
> URL: https://issues.apache.org/jira/browse/HIVE-23730
> Project: Hive
> Issue Type: Sub-task
> Reporter: Panagiotis Garefalakis
> Assignee: Panagiotis Garefalakis
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> Compiler needs to track the original TS key columnName used for MJ
> probedecode.
> Even though we know the MJ keyCol at compile time, this could be generated by
> previous (parent) operators thus we dont always know the original TS column
> it maps to.
> To find the original columnMapping, we need to track the MJ keyCol through
> the operator pipeline. Tracking can be done through the parent operator
> ColumnExprMap and RowSchema.
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