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https://issues.apache.org/jira/browse/SPARK-2431?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14057640#comment-14057640
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Takuya Ueshin commented on SPARK-2431:
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PRed: https://github.com/apache/spark/pull/1357
> Refine StringComparison and related codes.
> ------------------------------------------
>
> Key: SPARK-2431
> URL: https://issues.apache.org/jira/browse/SPARK-2431
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Takuya Ueshin
>
> 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}}.
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