It works on MR as well.

From: Oleksiy S <[email protected]>
Reply-To: "[email protected]" <[email protected]>
Date: Wednesday, April 18, 2018 at 5:24 AM
To: "[email protected]" <[email protected]>, "[email protected]" 
<[email protected]>
Subject: Does MERGE feature works only on TEZ in Hive-2.3?

Hi all!

Does MERGE feature  works only on TEZ in Hive-2.3?

see

  *   https://issues.apache.org/jira/browse/HIVE-10924
  *   
https://community.hortonworks.com/articles/97113/hive-acid-merge-by-example.html

--
Oleksiy

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