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From Timo Walther <twal...@apache.org>
Subject Re: lack of function and low usability of provided function
Date Thu, 23 Aug 2018 08:10:16 GMT
Hi Henry,

thanks for giving feedback. The set of built-in functions is a continous 
effort that will never be considered as "done". If you think a function 
should be supported, you can open issues in FLINK-6810 and we can 
discuss its priority.

Flink is an open source project so feel also free to contribute either 
by opening issues, reviewing existing PRs, or code.


Am 23.08.18 um 10:01 schrieb vino yang:
> Hi Henry,
> I recently submitted some PRs about Scalar functions, some of which 
> have been merged and some are being reviewed, and some may be what you 
> need.
> Log2(x) :https://issues.apache.org/jira/browse/FLINK-9928 will be 
> released in Flink 1.7
> exp(x): exists here 
> https://ci.apache.org/projects/flink/flink-docs-stable/dev/table/sql.html
> regular express support: use similar to , also see here 
> https://ci.apache.org/projects/flink/flink-docs-stable/dev/table/sql.html
> regex extract : https://issues.apache.org/jira/browse/FLINK-9990 
> reviewing
> regex replace : https://issues.apache.org/jira/browse/FLINK-9991 reviewing
> The status of most scalar functions can be seen here : 
> https://issues.apache.org/jira/browse/FLINK-6810
> Thanks, vino.
> 徐涛 <happydexutao@gmail.com <mailto:happydexutao@gmail.com>> 
> 于2018年8月23日周四 下午3:16写道:
>     Hi All,
>             I found flink is lack of some basic functions , for
>     example string split, regular express support, json parse and
>     extract support, these function are used frequently in development
>     , but they are not supported, use has to write UDF to support this.
>             And some of the provided functions are lack of usability,
>     for example log(2, 1.0) and exp(1.0)  with double params are not
>     supported. I think they are not hard to implement and they are
>     very basic functions.
>             Will flink enhance the basic functions , maybe in later
>     releases?
>     Best,
>     Henry

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