GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/13765
[SPARK-16052][SQL] Add CollapseRepartitionBy optimizer
## What changes were proposed in this pull request?
This issue adds a new optimizer, `CollapseRepartitionBy`, which is similar
with `CollapseRepartition`. Also, this PR adds a testsuite for both
`CollapseRepartition` and `CollapseRepartitionBy`.
**Before**
```scala
scala> spark.range(10).repartition(1, $"id").repartition(1, $"id").explain
== Physical Plan ==
Exchange hashpartitioning(id#0L, 1)
+- Exchange hashpartitioning(id#0L, 1)
+- *Range (0, 10, splits=8)
```
**After**
```scala
scala> spark.range(10).repartition(1, $"id").repartition(1, $"id").explain
== Physical Plan ==
Exchange hashpartitioning(id#0L, 1)
+- *Range (0, 10, splits=8)
```
## How was this patch tested?
Pass the Jenkins tests (including a new testsuite).
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-16052
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13765.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 #13765
----
commit caeb08f9e296dc1da3be9728a188b6cc662b6ab1
Author: Dongjoon Hyun <dongj...@apache.org>
Date: 2016-06-19T01:03:48Z
[SPARK-16052][SQL] Add CollapseRepartitionBy optimizer
----
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