[jira] [Resolved] (SPARK-20399) Can't use same regex pattern between 1.6 and 2.x due to unescaped sql string in parser

["Wenchen Fan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-20399?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wenchen Fan resolved SPARK-20399.
---------------------------------
    Resolution: Fixed

> Can't use same regex pattern between 1.6 and 2.x due to unescaped sql string in parser
> --------------------------------------------------------------------------------------
>
>                 Key: SPARK-20399
>                 URL: https://issues.apache.org/jira/browse/SPARK-20399
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.2.0
>            Reporter: Liang-Chi Hsieh
>            Assignee: Liang-Chi Hsieh
>             Fix For: 2.2.0
>
>
> The new SQL parser is introduced into Spark 2.0. Seems it bring an issue regarding the regex pattern string.
> The following codes can reproduce it:
> {code}
> val data = Seq("\u0020\u0021\u0023", "abc")
> val df = data.toDF()
> // 1st usage: works in 1.6
> // Let parser parse pattern string
> val rlike1 = df.filter("value rlike '^\\x20[\\x20-\\x23]+$'")
> // 2nd usage: works in 1.6, 2.x
> // Call Column.rlike so the pattern string is a literal which doesn't go through parser
> val rlike2 = df.filter($"value".rlike("^\\x20[\\x20-\\x23]+$"))
> // In 2.x, we need add backslashes to make regex pattern parsed correctly
> val rlike3 = df.filter("value rlike '^\\\\x20[\\\\x20-\\\\x23]+$'")
> {code}
> Due to unescaping SQL String in parser, the first usage working in 1.6 can't work in 2.0. To make it work, we need to add additional backslashes.
> It is quite weird that we can't use the same regex pattern string in the 2 usages. I think we should not unescape regex pattern string.



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