GitHub user davies opened a pull request:
https://github.com/apache/spark/pull/14548
[SPARK-16958] [SQL] Reuse subqueries within the same query
## What changes were proposed in this pull request?
There could be multiple subqueries that generate same results, we could
re-use the result instead of running it multiple times.
This PR also cleanup up how we run subqueries.
## How was this patch tested?
Existing tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/davies/spark subq
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14548.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 #14548
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commit 1348ba72d9562714ad020483ff2e067c05114957
Author: Davies Liu <[email protected]>
Date: 2016-08-08T22:24:07Z
Reuse subquery
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