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From hvanhovell <...@git.apache.org>
Subject [GitHub] spark pull request: [SPARK-13136][SQL] Create a dedicated Broadcas...
Date Thu, 04 Feb 2016 21:47:30 GMT
GitHub user hvanhovell opened a pull request:

    https://github.com/apache/spark/pull/11083

    [SPARK-13136][SQL] Create a dedicated Broadcast exchange operator [WIP]

    Quite a few Spark SQL join operators broadcast one side of the join to all nodes. The
are a few problems with this:
    
    - This conflates broadcasting (a data exchange) with joining. Data exchanges should be
managed by a different operator.
    - All these nodes implement their own (duplicate) broadcasting logic.
    - Re-use of often used indices is quite hard.
    
    This PR defines a ```Broadcast``` as a unique kind of ```Distribution```. To match this
distribution we implement a ```Broadcast``` operator and have ```EnsureRequirements``` plan
this operator.
    
    TODO's:
    
    - [ ] Fix code generation.
    - [ ] Add other broadcasting operators.
    
    cc @rxin @davies 

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

    $ git pull https://github.com/hvanhovell/spark SPARK-13136

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

    https://github.com/apache/spark/pull/11083.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 #11083
    
----
commit aa7120e0cd8b40a9d0b3edf7c33f18a530d597bc
Author: Herman van Hovell <hvanhovell@questtec.nl>
Date:   2016-02-04T19:13:42Z

    Initial Broadcast design

commit c2b7533f1fb30e9d93856adf4cef4107945670cc
Author: Herman van Hovell <hvanhovell@questtec.nl>
Date:   2016-02-04T21:34:34Z

    Fix Exchange and initial code gen attempt.

----


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