GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/14452
[SPARK-16849][SQL] Improve subquery execution by deduplicating the
subqueries with the same results
## What changes were proposed in this pull request?
The subqueries in SparkSQL will be run even they have the same physical
plan and output same results. We should be able to deduplicate these subqueries
which are referred in a query for many times.
## How was this patch tested?
Jenkins tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 single-exec-subquery
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14452.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 #14452
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commit 00b29ede65b84e0fc99ab9e0ebd33f6092077bbc
Author: Liang-Chi Hsieh <sim...@tw.ibm.com>
Date: 2016-08-01T03:41:34Z
Dedup common subqueries.
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