GitHub user zuyu opened a pull request:

    https://github.com/apache/incubator-quickstep/pull/245

    Dispatch BuildHashJoin and Aggregation based on block locality.

    This PR allows to deterministically dispatch `BuildHashJoin` and 
`Aggregation` based on block locality. Previously, the dispatch algorithm 
naively uses a round-robin approach.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/zuyu/incubator-quickstep 
block-locality-dispatch

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/incubator-quickstep/pull/245.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #245
    
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commit ece7e424b5c43e91dbe6e52b1ca95312696e57d2
Author: Zuyu Zhang <zu...@apache.org>
Date:   2017-04-11T07:26:40Z

    Dispatch BuildHashJoin and Aggregation based on block locality.

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