Vineet Garg created HIVE-21007: ---------------------------------- Summary: Semi join + Union can lead to wrong plans Key: HIVE-21007 URL: https://issues.apache.org/jira/browse/HIVE-21007 Project: Hive Issue Type: Bug Reporter: Vineet Garg Assignee: Vineet Garg Attachments: HIVE-21007.1.patch
Tez compiler has the ability to push JOIN within UNION (by replicating join on each branch). If this JOIN had a SJ branch outgoing (or incoming) it could mess up the plan and end up generating incorrect or wrong plan. As a safe measure any SJ branch after UNION should be removed (until we improve the logic to better handle SJ branches) -- This message was sent by Atlassian JIRA (v7.6.3#76005)