GitHub user lianhuiwang opened a pull request:
https://github.com/apache/spark/pull/14111
[SPARK-16456][SQL] Reuse the uncorrelated scalar subqueries with the same
logical plan in a query
## What changes were proposed in this pull request?
In
[TPCDS-Q14](https://github.com/apache/spark/blob/master/sql/core/src/test/resources/tpcds/q14a.sql)
the same physical plan of uncorrelated scalar subqueries from a CTE could be
executed multiple times, we should re-use the same result to avoid the
duplicated computing.
## How was this patch tested?
Pass the Jenkins tests (including a new testcase).
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/lianhuiwang/spark subquery-reuse
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14111.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 #14111
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commit 5290e42d416897bea4914c7ef2472c7b8190ea0f
Author: Lianhui Wang <lianhuiwan...@gmail.com>
Date: 2016-07-09T04:18:13Z
init commit
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