[
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 SQL
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
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
> 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 & 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
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
