Panagiotis Garefalakis created HIVE-23730:

             Summary: Compiler support tracking TS keyColName for Probe MapJoin
                 Key: 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 
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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