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From Deepak Jaiswal <>
Subject Re: Review Request 63427: HIVE-17936
Date Thu, 02 Nov 2017 20:45:18 GMT

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(Updated Nov. 2, 2017, 8:45 p.m.)

Review request for hive, Ashutosh Chauhan and Jason Dere.

Repository: hive-git


Dynamic Semijoin Reduction : markSemiJoinForDPP marks unwanted semijoin branches

In method markSemiJoinForDPP (HIVE-17399), the nDVs comparison should not have equality as
there is a chance that the values are same on both sides and the branch is still marked as
good when it shouldn't be.
Add a configurable factor to see how useful this is if nDVs on smaller side are only slightly
less than that on TS side.

Diffs (updated)

  common/src/java/org/apache/hadoop/hive/conf/ 6631a6e45d 
  ql/src/java/org/apache/hadoop/hive/ql/parse/ da30c3b642 
  ql/src/test/queries/clientpositive/dynamic_semijoin_reduction.q 6cc0a7f7a9 
  ql/src/test/results/clientpositive/llap/dynamic_semijoin_reduction.q.out 1a1a4d9b2d 





Deepak Jaiswal

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