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https://issues.apache.org/jira/browse/SPARK-9213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14634652#comment-14634652
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Reynold Xin commented on SPARK-9213:
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I think hbase/presto both use joni. We can look at their source code for
inspiration and experience.
> 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.]
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