Peter Varga created HIVE-23725:

             Summary: ValidTxnManager snapshot outdating causing partial reads 
in merge inserst
                 Key: HIVE-23725
             Project: Hive
          Issue Type: Bug
            Reporter: Peter Varga
            Assignee: Peter Varga

When the ValidTxnManager invalidates the snapshot during merge insert and 
starts to read committed transactions that were not committed when the query 
compilation happened, it can cause partial read problems if the committed 
transaction created new partition in the source or target table.

The solution should be not only fix the snapshot but also recompile the query 
and acquire the locks again

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