GitHub user davies opened a pull request:
https://github.com/apache/spark/pull/9969
[SPARK-11982] [SQL] improve performance of cartesian product
This PR improve the performance of CartesianProduct by caching the result
of right plan.
After this patch, the query time of TPC-DS Q65 go down to 12 seconds from
28 minutes (140X faster).
cc @nongli
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/davies/spark improve_cartesian
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/9969.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 #9969
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commit 162268c2410d19caf7032e17ccccac1aecc1237c
Author: Davies Liu <[email protected]>
Date: 2015-11-25T09:00:03Z
improve performance of cartesian product
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