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https://issues.apache.org/jira/browse/SPARK-9213?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14696561#comment-14696561
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Yadong Qi edited comment on SPARK-9213 at 8/14/15 6:33 AM:
-----------------------------------------------------------
[~rxin] Yes, I will do it as below:
```
case class Like(left: Expression, right: Expression) {
if (flag) {
JavaLike(left, right)
} else {
JoniLike(left, right)
}
}
case class JavaLike(left: Expression, right: Expression)
case class JoniLike(left: Expression, right: Expression)
```
Right?
was (Author: waterman):
[~rxin] Yes, I will do it as below:
```
case class Like(left: Expression, right: Expression) {
if (flag) {
JavaLike(left, right)
} else {
JoniLike(left, right)
}
}
case class JavaLike(left: Expression, right: Expression)
case class JoniLike(left: Expression, right: Expression)
```
Right?
> 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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