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https://issues.apache.org/jira/browse/FLINK-6810?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16563646#comment-16563646
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Fabian Hueske commented on FLINK-6810:
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Hi [~hequn8128], thanks for adding contribution instructions! That's a great
idea. I'll add another point about testing. Thanks, Fabian
> 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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