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From "Harish Butani" <>
Subject Review Request 22752: HIVE-7063: Optimize for the Top N within a Group use case
Date Wed, 18 Jun 2014 20:40:42 GMT

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Review request for hive and Ashutosh Chauhan.

Bugs: HIVE-7063

Repository: hive-git


It is common to rank within a Group/Partition and then only return the Top N entries within
each Group.
With Streaming mode for Windowing, we should push the post filter on the rank into the Windowing
processing as a Limit expression.


  ql/src/java/org/apache/hadoop/hive/ql/exec/ PRE-CREATION 
  ql/src/java/org/apache/hadoop/hive/ql/exec/ 03a64e8 
  ql/src/java/org/apache/hadoop/hive/ql/exec/ bc81467 
  ql/src/java/org/apache/hadoop/hive/ql/exec/vector/ 11024da

  ql/src/java/org/apache/hadoop/hive/ql/plan/ 8c1d336 
  ql/src/java/org/apache/hadoop/hive/ql/plan/ptf/ c547e62 
  ql/src/java/org/apache/hadoop/hive/ql/ppd/ 7aaf455 
  ql/src/java/org/apache/hadoop/hive/ql/udf/ptf/ 2290766 
  ql/src/test/queries/clientpositive/windowing_streaming.q PRE-CREATION 
  ql/src/test/results/clientpositive/windowing_streaming.q.out PRE-CREATION 



added new .q tests


Harish Butani

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