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Posted to issues@spark.apache.org by "Reynold Xin (JIRA)" <ji...@apache.org> on 2015/07/21 09:27:04 UTC
[jira] [Commented] (SPARK-9213) Improve regular expression
performance (via joni)
[ https://issues.apache.org/jira/browse/SPARK-9213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14634652#comment-14634652 ]
Reynold Xin commented on SPARK-9213:
------------------------------------
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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