GitHub user saucam opened a pull request:
https://github.com/apache/spark/pull/9858
SPARK-11878: Eliminate distribute by in case group by is present with
exactly the same grouping expressions
For queries like :
select <> from table group by a distribute by a
we can eliminate distribute by ; since group by will anyways do a hash
partitioning
Also applicable when user uses Dataframe API but the number of partitions
in RepartitionByExpression is not specified (None)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/saucam/spark eliminatedistribute
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/9858.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 #9858
----
commit a86feca6e2b9aaba9babed8854a39c97b59f34cd
Author: Yash Datta <yash.da...@guavus.com>
Date: 2015-11-20T07:43:47Z
SPARK-11878: Eliminate distribute by in case group by is present with
exactly the same grouping expressions
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