GitHub user ptkool opened a pull request:
https://github.com/apache/spark/pull/17708
Add new query hint NO_COLLAPSE.
## What changes were proposed in this pull request?
This PR proposes adding a new query hint called NO_COLLAPSE that can be
used to prevent adjacent projections from being collapsed.
## How was this patch tested?
Test using unit tests, integration tests and manual tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ptkool/spark no_collapse_query_hint
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17708.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 #17708
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commit 3f1e6a1c029709032b06236c2a8e151fe61b53b8
Author: ptkool <[email protected]>
Date: 2017-04-20T15:27:41Z
Add new query hint NO_COLLAPSE.
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