GitHub user heary-cao opened a pull request:

    https://github.com/apache/spark/pull/18892

    Improvement a special case for non-deterministic projects and filters in 
optimizer

    ## What changes were proposed in this pull request?
    
    Currently, Did a lot of special handling for non-deterministic projects and 
filters in optimizer. but not good enough. this patch add a new special case 
for non-deterministic projects and filters. Deal with that we only need to read 
user needs fields for non-deterministic projects and filters in optimizer.
    
    ## How was this patch tested?
    
    Should be covered existing test cases and add test cases.


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/heary-cao/spark non-deterministic

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/spark/pull/18892.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 #18892
    
----
commit 1bc4fbfc5f123445995d1dfa0369f063a5f8ff6c
Author: caoxuewen <cao.xue...@zte.com.cn>
Date:   2017-08-09T09:04:37Z

    Improvement a special case for non-deterministic projects and filters in 
optimizer

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