GitHub user ueshin opened a pull request:
https://github.com/apache/spark/pull/1357
[SPARK-2431][SQL] Refine StringComparison and related codes.
Refine `StringComparison` and related codes as follows:
- `StringComparison` could be similar to `StringRegexExpression` or
`CaseConversionExpression`.
- Nullability of `StringRegexExpression` could depend on children's
nullabilities.
- Add a case that the like condition includes no wildcard to
`LikeSimplification`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ueshin/apache-spark issues/SPARK-2431
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/1357.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 #1357
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commit 680bb72ee0dafaeae34dbc3dbff3984f856b5e18
Author: Takuya UESHIN <ues...@happy-camper.st>
Date: 2014-07-10T15:49:07Z
Refine StringComparison.
commit b9da9d21da49f7d92c9b194173805b1a627e841b
Author: Takuya UESHIN <ues...@happy-camper.st>
Date: 2014-07-10T15:49:55Z
Fix nullability of StringRegexExpression.
commit 77766f55c331dac2f81f657d7aedb06538b29c41
Author: Takuya UESHIN <ues...@happy-camper.st>
Date: 2014-07-10T15:54:46Z
Add a case that the like condition includes no wildcard to
LikeSimplification.
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