GitHub user rxin opened a pull request:
https://github.com/apache/spark/pull/8876
[SPARK-10731][SQL] Delegate to Scala's DataFrame.take implementation in
Python DataFrame.
Python DataFrame.head/take now requires scanning all the partitions. This
pull request changes them to delegate the actual implementation to Scala
DataFrame (by calling DataFrame.take).
This is more of a hack for fixing this issue in 1.5.1. A more proper fix is
to change executeCollect and executeTake to return InternalRow rather than Row,
and thus eliminate the extra round-trip conversion.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/rxin/spark SPARK-10731
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/8876.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 #8876
----
commit 778c2fd4d9b9be6b6ac1f0aa496d73a2446aa1a7
Author: Reynold Xin <[email protected]>
Date: 2015-09-23T02:09:54Z
[SPARK-10731][SQL] Delegate to Scala's DataFrame.take implementation in
Python DataFrame.
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