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From "Yadong Qi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-9213) Improve regular expression performance (via joni)
Date Fri, 14 Aug 2015 07:23:45 GMT

    [ https://issues.apache.org/jira/browse/SPARK-9213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14696630#comment-14696630
] 

Yadong Qi commented on SPARK-9213:
----------------------------------

I know, thanks!

> Improve regular expression performance (via joni)
> -------------------------------------------------
>
>                 Key: SPARK-9213
>                 URL: https://issues.apache.org/jira/browse/SPARK-9213
>             Project: Spark
>          Issue Type: Umbrella
>          Components: SQL
>            Reporter: Reynold Xin
>
> I'm creating an umbrella ticket to improve regular expression performance for string
expressions. Right now our use of regular expressions is inefficient for two reasons:
> 1. Java regex in general is slow.
> 2. We have to convert everything from UTF8 encoded bytes into Java String, and then run
regex on it, and then convert it back.
> There are libraries in Java that provide regex support directly on UTF8 encoded bytes.
One prominent example is joni, used in JRuby.
> Note: all regex functions are in https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala



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