GitHub user jeanlyn opened a pull request:
https://github.com/apache/spark/pull/6682
[SPARK-2205][SPARK-7871][SQL]Advoid redundancy exchange
When only use the output partitioning of `BinaryNode` will probably add
unnecessary `Exchange` like multiway join.
This PR add `meetPartitions ` to SparkPlan advoid redundancy exchanges by
use to save the partitioning of the node and the child,and will be reset to
node partitioning when need shuffle.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jeanlyn/spark addMeetRequire
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/6682.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 #6682
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commit 7e52db3e6ff6e2dffe0c599730b8019319fda185
Author: jeanlyn <jeanly...@gmail.com>
Date: 2015-06-06T10:22:57Z
remove unnecessary exchange
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