[jira] [Commented] (FLINK-9990) Add regex_extract supported in TableAPI and SQL

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-9990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16561049#comment-16561049 ] 

ASF GitHub Bot commented on FLINK-9990:
---------------------------------------

yanghua opened a new pull request #6448: [FLINK-9990] Add regex_extract supported in TableAPI and SQL
URL: https://github.com/apache/flink/pull/6448
 
 
   ## What is the purpose of the change
   
   *This pull request add regex_extract supported in TableAPI and SQL*
   
   ## Brief change log
   
     - *Add regex_extract supported in TableAPI and SQL*
   
   ## Verifying this change
   
   This change is already covered by existing tests, such as *ScalarFunctionsTest#testRegexExtract*.
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (yes / **no**)
     - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (yes / **no**)
     - The serializers: (yes / **no** / don't know)
     - The runtime per-record code paths (performance sensitive): (yes / **no** / don't know)
     - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes / **no** / don't know)
     - The S3 file system connector: (yes / **no** / don't know)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (**yes** / no)
     - If yes, how is the feature documented? (not applicable / **docs** / JavaDocs / not documented)
   

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> Add regex_extract supported in TableAPI and SQL
> -----------------------------------------------
>
>                 Key: FLINK-9990
>                 URL: https://issues.apache.org/jira/browse/FLINK-9990
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table API & SQL
>            Reporter: vinoyang
>            Assignee: vinoyang
>            Priority: Minor
>              Labels: pull-request-available
>
> regex_extract is a very useful function, it returns a string based on a regex pattern and a index.
> For example : 
> {code:java}
> regexp_extract('foothebar', 'foo(.*?)(bar)', 2) // returns 'bar.'
> {code}
> It is provided as a UDF in Hive, more details please see[1].
> [1]: https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF



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