GitHub user viirya opened a pull request:
https://github.com/apache/spark/pull/12138
[SPARK-14354][SQL] Let Expand take name expressions and infer output
attributes
## What changes were proposed in this pull request?
JIRA: https://issues.apache.org/jira/browse/SPARK-14354
Currently we create `Expand` operator by specifying projections
(`Seq[Seq[Expression]]`) and its output. We allow `Expand` to reuse child
operator's attributes and so make its constraints invalid when we change the
corresponding values of these attributes (e.g., making them null when doing a
roll up). We should let it take name expressions and infer output itself.
## How was this patch tested?
Modified `ConstraintPropagationSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/viirya/spark-1 expand-name-expr
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12138.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 #12138
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commit 376d2e1c910acf017d562199a471a2bc62fc2207
Author: Liang-Chi Hsieh <sim...@tw.ibm.com>
Date: 2016-04-03T13:28:55Z
Infer Expand output from projections.
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