GitHub user davies opened a pull request:
https://github.com/apache/spark/pull/12328
[SPARK-14562] [SQL] improve constraints propagation in Union
## What changes were proposed in this pull request?
Currently, Union only takes intersect of the constraints from it's
children, all others are dropped, we should try to merge them together.
This PR try to merge the constraints that have the same reference but came
from different children, for example: `a > 10` and `a < 100` could be merged as
`a > 10 || a < 100`.
## How was this patch tested?
Added more cases in existing test.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/davies/spark union_const
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12328.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 #12328
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commit ac45ea34000da4213fea90f48d45dae366b1d3fe
Author: Davies Liu <[email protected]>
Date: 2016-04-12T16:44:13Z
improve constraints propagation in Union
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