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From "Rui Li (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-17020) Aggressive RS dedup can incorrectly remove OP tree branch
Date Tue, 04 Jul 2017 12:51:00 GMT
Rui Li created HIVE-17020:
-----------------------------

             Summary: Aggressive RS dedup can incorrectly remove OP tree branch
                 Key: HIVE-17020
                 URL: https://issues.apache.org/jira/browse/HIVE-17020
             Project: Hive
          Issue Type: Bug
            Reporter: Rui Li
            Assignee: Rui Li


Suppose we have an OP tree like this:
{noformat}
     ...
      |
     RS[1]
      |
    SEL[2]
    /    \
SEL[3]   SEL[4]
  |         |
RS[5]     FS[6]
  |
 ... 
{noformat}
When doing aggressive RS dedup, we'll remove all the operators between RS5 and RS1, and thus
the branch containing FS6 is lost.



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