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https://issues.apache.org/jira/browse/SPARK-19555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15862293#comment-15862293
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Apache Spark commented on SPARK-19555:
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User 'lins05' has created a pull request for this issue:
https://github.com/apache/spark/pull/16893
> Improve inefficient StringUtils.escapeLikeRegex() method
> --------------------------------------------------------
>
> Key: SPARK-19555
> URL: https://issues.apache.org/jira/browse/SPARK-19555
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Josh Rosen
>
> Spark's StringUtils.escapeLikeRegex() method is written inefficiently,
> performing tons of object allocations due to the use zip(), flatMap() , and
> mkString. Instead, I think method should be rewritten in an imperative style
> using a Java string builder.
> This method can become a performance bottleneck in cases where regex
> expressions are used with non-constant-foldable expressions (e.g. the regex
> expression comes from the data rather than being part of the query).
> Here's the code in question:
> https://github.com/apache/spark/blob/d785217b791882e075ad537852d49d78fc1ca31b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/StringUtils.scala#L28
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