GitHub user davies opened a pull request:
https://github.com/apache/spark/pull/8833
[SPARK-10685] [SPARK-8632] [SQL] [PYSPARK] Python UDF should only compute
the upstream once
This PR changes to buffer the rows from upstream into a Queue, then zip
them with result from Python UDF, to avoid the double computation of upstream.
Thanks the idea from @rxin to simplify the buffer greatly!
cc @marmbrus
Closes #8662
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/davies/spark pyudf
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/8833.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 #8833
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commit b98cf2a45984d24bdb181e4d43d8f83ca1849aff
Author: Davies Liu <dav...@databricks.com>
Date: 2015-09-19T05:42:26Z
compute the upstream once
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