Josh Rosen created SPARK-19555:
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Summary: 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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