GitHub user zuyu opened a pull request:

    https://github.com/apache/incubator-quickstep/pull/257

    Added Partition Rule for HashJoin.

    This PR substitutes #241 to add support for partitioned hash join. The rule 
adds repartitions if needed as follows:
    
    ```
          /*
           * Whether left or right side needs to repartition.
           *
           * 
--------------------------------------------------------------------------
           * | Right \ Left     | No Partition  | Hash Partition h' | Other 
Partition |
           * 
--------------------------------------------------------------------------
           * | No Partition     | false \ false |  false \ false    |  true \ 
true    |
           * 
--------------------------------------------------------------------------
           * | Hash Partition h | false \ true  | false* \ false    | false \ 
true    |
           * 
--------------------------------------------------------------------------
           * | Other Partition  |  true \ true  |   true \ false    |  true \ 
true    |
           * 
--------------------------------------------------------------------------
           *
           * Hash Partition h / h': the paritition attributes are as the same 
as the join attributes.
           * *: If h and h' has different number of partitions, the left side 
needs to repartition.
           */
    ```
    
    Assigned to @jianqiao.

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

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

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

    https://github.com/apache/incubator-quickstep/pull/257.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 #257
    
----
commit 46f514dcd5d22ab3cecaa8dcb2446ebdd8dba6e7
Author: Zuyu Zhang <zu...@apache.org>
Date:   2017-06-14T02:50:41Z

    Added Partition Rule for HashJoin.

----


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