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From hbdeshmukh <...@git.apache.org>
Subject [GitHub] incubator-quickstep pull request #41: Remove misleading comment about hash t...
Date Mon, 27 Jun 2016 18:57:28 GMT
Github user hbdeshmukh commented on a diff in the pull request:

    https://github.com/apache/incubator-quickstep/pull/41#discussion_r68635258
  
    --- Diff: relational_operators/HashJoinOperator.cpp ---
    @@ -65,21 +65,11 @@ DEFINE_bool(vector_based_joined_tuple_collector, false,
                 "If true, use simple vector-based joined tuple collector in "
                 "hash join, with a final sort pass to group joined tuple pairs "
                 "by inner block. If false, use unordered_map based collector that "
    -            "keeps joined pairs grouped by inner block as they are found "
    -            "(this latter option has exhibited performance/scaling problems, "
    -            "particularly in NUMA contexts).");
    +            "keeps joined pairs grouped by inner block as they are found.");
    --- End diff --
    
    I don't mind removing it. If I recall correctly, an older profiling done by @pateljm revealed
that map collector outperformed the vector collector pretty much always. 


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