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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-10145) Add replace supported in TableAPI and SQL
Date Tue, 21 Aug 2018 06:02:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-10145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16586973#comment-16586973

ASF GitHub Bot commented on FLINK-10145:

xccui commented on issue #6576: [FLINK-10145][table] Add replace supported in TableAPI and
URL: https://github.com/apache/flink/pull/6576#issuecomment-414559283
   Hi @Guibo-Pan, in SQL convention, any null argument will lead to a null result. Thus when
generating a scalar function call, all the arguments (expressions) will be first checked to
ensure not null. See https://github.com/apache/flink/blob/d5de2bcf122fd931080ac7a9edc704c93dbe15ee/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/CodeGenerator.scala#L406

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> Add replace supported in TableAPI and SQL
> -----------------------------------------
>                 Key: FLINK-10145
>                 URL: https://issues.apache.org/jira/browse/FLINK-10145
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table API &amp; SQL
>            Reporter: Guibo Pan
>            Assignee: Guibo Pan
>            Priority: Major
>              Labels: pull-request-available
> replace is an useful function for String. 
> for example:
> {code:java}
> select replace("Hello World", "World", "Flink") // return "Hello Flink"
> select replace("ababab", "abab", "z") // return "zab"
> {code}
> It is supported as a UDF in Hive, more details please see[1]
> [1]: https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF#LanguageManualUDF-StringFunctions

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