GitHub user heary-cao opened a pull request:
https://github.com/apache/spark/pull/20375
[SPARK-23199][SQL]improved Removes repetition from group expressions in
Aggregate
## What changes were proposed in this pull request?
Currently, all Aggregate operations will go into
RemoveRepetitionFromGroupExpressions, but there is no group expression or there
is no duplicate group expression in group expression, we not need copy for
logic plan.
## How was this patch tested?
the existed test case.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/heary-cao/spark RepetitionGroupExpressions
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/20375.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 #20375
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commit 804e5068f16753b7fd40c8edf75dbb756d76d571
Author: caoxuewen <cao.xuewen@...>
Date: 2018-01-24T03:00:48Z
improved Removes repetition from group expressions in Aggregate
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