[jira] [Commented] (SPARK-36992) Improve byte array sort perf by unify getPrefix function of UTF8String and ByteArray

["Apache Spark (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-36992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17427981#comment-17427981 ] 

Apache Spark commented on SPARK-36992:
--------------------------------------

User 'ulysses-you' has created a pull request for this issue:
https://github.com/apache/spark/pull/34267

> Improve byte array sort perf by unify getPrefix function of UTF8String and ByteArray
> ------------------------------------------------------------------------------------
>
>                 Key: SPARK-36992
>                 URL: https://issues.apache.org/jira/browse/SPARK-36992
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.3.0
>            Reporter: XiDuo You
>            Priority: Major
>
> When execute sort operator, we first compare the prefix. However the getPrefix function of byte array is slow. We use first 8 bytes as the prefix, so at most we will call 8 times with `Platform.getByte` which is slower than call once with `Platform.getInt` or `Platform.getLong`.



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