zabetak opened a new pull request #1544:
URL: https://github.com/apache/hive/pull/1544


   
   ### What changes were proposed in this pull request?
   
   Use hash(hash(hash(a,b),c),d) instead of hash(a,b,c,d) when constructing
   the multi-col semijoin reducer.
   
   ### Why are the changes needed?
   In order to use fully vectorized execution on multi-col semijoin reducers.
   
   ### Does this PR introduce _any_ user-facing change?
   Only changes in EXPLAIN plans.
   
   ### How was this patch tested?
   `mvn test -Dtest=TestTezPerfCliDriver -Dqfile="query50.q"`
   


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