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https://issues.apache.org/jira/browse/HIVE-23730?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Panagiotis Garefalakis reassigned HIVE-23730:
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> 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
>
> TezCompiler needs to track the original TS key columnName used for MJ
> probedecode.
> Even thought 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. The tracking is done through the output column name to
> input expression Map of the operators.
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