Eugene Koifman created HIVE-17282:

             Summary: OrcRawRecordMerger collapseEvents mode should not produce 
delete events
                 Key: HIVE-17282
             Project: Hive
          Issue Type: Improvement
          Components: Transactions
    Affects Versions: 3.0.0
            Reporter: Eugene Koifman
            Priority: Minor

it made sense before HIVE-17089 where we had multiple versions of the same row 
and this mode produce the latest one.
Now outputting delete events is only need for compaction and 
_VectorizedOrcAcidRowBatchReader_.  The latter only reads delete_delta and 
OrcInputFormat skips all delete events from _OrcRawRecordMerger_

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