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Posted to issues@spark.apache.org by "Wenchen Fan (Jira)" <ji...@apache.org> on 2024/04/10 15:25:00 UTC

[jira] [Resolved] (SPARK-47693) Improve UTF8_BINARY_LCASE collation comparison performance

     [ https://issues.apache.org/jira/browse/SPARK-47693?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan resolved SPARK-47693.
---------------------------------
    Fix Version/s: 4.0.0
       Resolution: Fixed

Issue resolved by pull request 45816
[https://github.com/apache/spark/pull/45816]

> Improve UTF8_BINARY_LCASE collation comparison performance
> ----------------------------------------------------------
>
>                 Key: SPARK-47693
>                 URL: https://issues.apache.org/jira/browse/SPARK-47693
>             Project: Spark
>          Issue Type: Task
>          Components: SQL
>    Affects Versions: 4.0.0
>            Reporter: Nikola Mandic
>            Assignee: Nikola Mandic
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 4.0.0
>
>
> Current collation [benchmarks|https://github.com/apache/spark/blob/e9f204ae93061a862e4da52c128eaf3512a66c7b/sql/core/benchmarks/CollationBenchmark-results.txt] indicate that UTF8_BINARY_LCASE collation comparisons are order of magnitude slower (~7-10x) than plain binary comparisons. Improve the performance by optimizing lowercase comparison function for UTF8String instances instead of performing full lowercase conversion before binary comparison.



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