[jira] [Assigned] (SPARK-21967) org.apache.spark.unsafe.types.UTF8String#compareTo Should Compare 8 Bytes at a Time for Better Performance

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

     [ https://issues.apache.org/jira/browse/SPARK-21967?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-21967:
------------------------------------

    Assignee: Apache Spark

> org.apache.spark.unsafe.types.UTF8String#compareTo Should Compare 8 Bytes at a Time for Better Performance
> ----------------------------------------------------------------------------------------------------------
>
>                 Key: SPARK-21967
>                 URL: https://issues.apache.org/jira/browse/SPARK-21967
>             Project: Spark
>          Issue Type: Improvement
>          Components: Spark Core
>    Affects Versions: 2.2.0
>            Reporter: Armin Braun
>            Assignee: Apache Spark
>            Priority: Minor
>              Labels: perfomance
>
> org.apache.spark.unsafe.types.UTF8String#compareTo contains the following TODO:
> {code}
>     int len = Math.min(numBytes, other.numBytes);
>     // TODO: compare 8 bytes as unsigned long
>     for (int i = 0; i < len; i ++) {
>       // In UTF-8, the byte should be unsigned, so we should compare them as unsigned int.
> {code}
> The todo should be resolved by comparing the maximum number of 64bit words possible in this method, before falling back to unsigned int comparison.



--
This message was sent by Atlassian JIRA
(v6.4.14#64029)

---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscribe@spark.apache.org
For additional commands, e-mail: issues-help@spark.apache.org