GitHub user JoshRosen opened a pull request:
https://github.com/apache/spark/pull/15070
[SPARK-17515] CollectLimit.execute() should perform per-partition limits
## What changes were proposed in this pull request?
CollectLimit.execute() incorrectly omits per-partition limits, leading to
performance regressions in case this case is hit (which should not happen in
normal operation, but can occur in some cases (see #15068 for one example).
## How was this patch tested?
Regression test in SQLQuerySuite that asserts the number of records scanned
from the input RDD.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/JoshRosen/spark SPARK-17515
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15070.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 #15070
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commit 506590753dbe59c71bf576751d3c2a50a70d9099
Author: Josh Rosen <joshro...@databricks.com>
Date: 2016-09-13T02:09:16Z
Add regression test.
commit ac01f87f72e7df9c8c40a00822b98ebccb0ff1f6
Author: Josh Rosen <joshro...@databricks.com>
Date: 2016-09-13T02:09:24Z
Fix by adding missing limit.
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