[jira] [Commented] (FLINK-6810) Add Some built-in Scalar Function supported

["Hequn Cheng (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-6810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16560665#comment-16560665 ] 

Hequn Cheng commented on FLINK-6810:
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Hi all, I added an instruction about how to contribute a build-in scalar function in this Jira description. Hope it helps you when you going to make a contribute.

> Add Some built-in Scalar Function supported
> -------------------------------------------
>
>                 Key: FLINK-6810
>                 URL: https://issues.apache.org/jira/browse/FLINK-6810
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API & SQL
>    Affects Versions: 1.4.0
>            Reporter: sunjincheng
>            Assignee: sunjincheng
>            Priority: Major
>              Labels: starter
>
> In this JIRA, will create some sub-task for add specific scalar function, such as mathematical-function {{LOG}}, date-functions
>  {{DATEADD}},string-functions {{LPAD}}, etc. 
> *How To Contribute a build-in scalar function*
> Thank you very much for contributing a build-in function. In order to make sure your contributions are in a good direction, it is recommended to read the following instructions.
> # Research the behavior of the function which you are going to contribute in major DBMSs. This is very import since we have to understand the exact semantics of the function.
> # It is recommended to add function both for sql and talbe-api.
> # Every scalar function should add TableAPI docs in  {{./docs/dev/table/tableApi.md#built-in-functions}}. Add SQL docs in {{./docs/dev/table/sql.md#built-in-functions}}. When add docs for table-api, you should add both scala docs and java docs. Make sure your description of the function is accurate. Please do not copy documentation from other projects. Especially if other projects are not Apache licensed.
> # Take overflow, NullPointerException and other exceptions into consideration.
> Welcome anybody to add the sub-task about standard database scalar function.



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