Panagiotis Garefalakis created HIVE-23730:
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Summary: 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
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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