GitHub user davies opened a pull request:
https://github.com/apache/spark/pull/10075
[SPARK-10277] [SQL] change the default plan for single distinct
Use try to match the behavior for single distinct aggregation with Spark
1.5, but that's not scalable, we should be robust by default, have a flag to
address performance regression for low cardinality aggregation.
cc @yhuai @nongli
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/davies/spark agg_15
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/10075.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 #10075
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commit 192a04dfa9f13829744c3734b6efb44caf6e8e3a
Author: Davies Liu <[email protected]>
Date: 2015-12-01T21:26:31Z
change the default plan for single distinct
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