Timo Walther commented on FLINK-7151:

Thank you [~ZhenqiuHuang]. We also have a discussion about giving properties to 
functions in the ML discussion "[DISCUSS] FLIP-64: Support for Temporary 
Objects in Table module". I think Postgres also has a {{WITH}} clause for this 
reason which aligns nicely to our {{CREATE TABLE xxx () WITH (...)}} clause.

> Add a basic function SQL DDL
> ----------------------------
>                 Key: FLINK-7151
>                 URL: https://issues.apache.org/jira/browse/FLINK-7151
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table SQL / API
>            Reporter: yuemeng
>            Assignee: Zhenqiu Huang
>            Priority: Critical
>              Labels: pull-request-available
>             Fix For: 1.10.0
>          Time Spent: 10m
>  Remaining Estimate: 0h
> Based on create function and table.we can register a udf,udaf,udtf use sql:
> {code}
> CREATE FUNCTION [IF NOT EXISTS] [catalog_name.db_name.]function_name AS 
> class_name;
> DROP FUNCTION [IF EXISTS] [catalog_name.db_name.]function_name;
> ALTER FUNCTION [IF EXISTS] [catalog_name.db_name.]function_name RENAME TO 
> new_name;
> {code}
> {code}
> CREATE function 'TOPK' AS 
> 'com.xxxx.aggregate.udaf.distinctUdaf.topk.ITopKUDAF';
> INSERT INTO db_sink SELECT id, TOPK(price, 5, 'DESC') FROM kafka_source GROUP 
> BY id;
> {code}
> This ticket can assume that the function class is already loaded in classpath 
> by users. Advanced syntax like to how to dynamically load udf libraries from 
> external locations can be on a separate ticket.

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