GitHub user zuyu opened a pull request:

    https://github.com/apache/incubator-quickstep/pull/264

    Added physical rule for partitioned aggregations.

    The partitioned aggregation, depending on whether having the group by 
expression, may generate two-level aggregations and an additional selection.
    
    If having the group by expression, the output node will he partitioned.

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

    $ git pull https://github.com/zuyu/incubator-quickstep 
partition-rule-for-aggr

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

    https://github.com/apache/incubator-quickstep/pull/264.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 #264
    
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commit 4d2ca7fc12dd538f7f8513f6133bcca3fffe7888
Author: Zuyu Zhang <zu...@apache.org>
Date:   2017-06-17T22:04:48Z

    Added physical rule for partitioned aggregations.

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