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Posted to issues@spark.apache.org by "Josh Rosen (JIRA)" <ji...@apache.org> on 2019/05/25 07:19:01 UTC

[jira] [Created] (SPARK-27839) Improve UTF8String.replace() / StringReplace performance

Josh Rosen created SPARK-27839:
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             Summary: Improve UTF8String.replace() / StringReplace performance
                 Key: SPARK-27839
                 URL: https://issues.apache.org/jira/browse/SPARK-27839
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.4.0
            Reporter: Josh Rosen
            Assignee: Josh Rosen


The UTF8String.replace() function and StringReplace expression are missing a few common-case optimizations, such as avoiding copies when the replacement does not change the string and avoiding redundant copying / decoding of the search and replacement strings in case they are constants.

I think there's room to significantly improve performance here, especially for single-character replacements.



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