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Posted to dev@hive.apache.org by "Deepak Jaiswal (JIRA)" <ji...@apache.org> on 2017/06/23 03:13:00 UTC

[jira] [Created] (HIVE-16947) Semijoin Reduction : Task cycle created due to multiple semijoins in conjunction with hashjoin

Deepak Jaiswal created HIVE-16947:
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             Summary: Semijoin Reduction : Task cycle created due to multiple semijoins in conjunction with hashjoin
                 Key: HIVE-16947
                 URL: https://issues.apache.org/jira/browse/HIVE-16947
             Project: Hive
          Issue Type: Bug
            Reporter: Deepak Jaiswal
            Assignee: Deepak Jaiswal


Typically a semijoin branch and a mapjoin may create a cycle when on same operator tree. This is already handled, however, a semijoin branch can serve more than one filters and the cycle detection logic currently only handles the 1st one causing cycles preventing the queries from running.



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