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Posted to issues@spark.apache.org by "Hyukjin Kwon (Jira)" <ji...@apache.org> on 2019/09/28 18:07:00 UTC
[jira] [Resolved] (SPARK-29281) Examples in Like/RLike doesn't
consider the default value of spark.sql.parser.escapedStringLiterals
[ https://issues.apache.org/jira/browse/SPARK-29281?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Hyukjin Kwon resolved SPARK-29281.
----------------------------------
Fix Version/s: 3.0.0
Resolution: Fixed
Issue resolved by pull request 25957
[https://github.com/apache/spark/pull/25957]
> Examples in Like/RLike doesn't consider the default value of spark.sql.parser.escapedStringLiterals
> ---------------------------------------------------------------------------------------------------
>
> Key: SPARK-29281
> URL: https://issues.apache.org/jira/browse/SPARK-29281
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Jungtaek Lim
> Assignee: Jungtaek Lim
> Priority: Minor
> Fix For: 3.0.0
>
>
> Please take a look at example of `LIKE`:
> [https://github.com/apache/spark/blob/d72f39897b00d0bbd7a4db9de281a1256fcf908d/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala#L97-L106]
> If spark.sql.parser.escapedStringLiterals=false, then it should fail as there's `\U` in pattern (spark.sql.parser.escapedStringLiterals=false by default) but it doesn't fail.
> {quote}The escape character is '\'. If an escape character precedes a special symbol or another
> escape character, the following character is matched literally. It is invalid to escape
> any other character.
> {quote}
> For the query
> {code:java}
> SET spark.sql.parser.escapedStringLiterals=false;
> SELECT '%SystemDrive%\Users\John' like '\%SystemDrive\%\Users%'; {code}
> SQL parser removes single `\` (not sure that is intended) so the expressions of Like are constructed as following:
> {code:java}
> LIKE - left `%SystemDrive%UsersJohn` / right `\%SystemDrive\%Users%`{code}
> which are no longer having origin intention.
> Same happens on RLike example:
> {code:java}
> SET spark.sql.parser.escapedStringLiterals=false;
> SELECT '%SystemDrive%\Users\John' rlike '%SystemDrive%\Users.*'; {code}
> {code:java}
> RLIKE - left `%SystemDrive%UsersJohn` / right `%SystemDrive%Users.*`{code}
>
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