GitHub user maropu opened a pull request:
https://github.com/apache/spark/pull/17970
[SPARK-20730][SQL] Add an optimizer rule to combine nested Concat
## What changes were proposed in this pull request?
This pr added a new Optimizer rule to combine nested Concat. The master
supports a pipeline operator '||' to concatenate strings in #17711 (This pr is
follow-up). Since the parser currently generates nested Concat expressions, the
optimizer needs to combine the nested expressions.
## How was this patch tested?
Added tests in `CombineConcatSuite` and `SQLQueryTestSuite`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/maropu/spark SPARK-20730
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17970.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 #17970
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commit 7b5bff517b8933a466a9e200b13c7b246d09dbab
Author: Takeshi Yamamuro <[email protected]>
Date: 2017-05-13T01:55:43Z
Add a optimizer rule to combine nested Concat
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