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https://issues.apache.org/jira/browse/FLINK-7151?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16913959#comment-16913959
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Zhenqiu Huang commented on FLINK-7151:
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[~phoenixjiangnan] As it is already in AthenaX. We would like to contribute
back. I will work with Shuyi on this. Thanks
> Add a 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: Shuyi Chen
> Priority: Critical
> Fix For: 1.10.0
>
>
> Based on create temporary 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}
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