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From "yuemeng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-7151) FLINK SQL support create temporary function and table
Date Wed, 12 Jul 2017 11:39:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7151?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16083845#comment-16083845

yuemeng commented on FLINK-7151:

yes,extend the ExternalCatalog to support register external functions is a very good way ,i
think,maybe we can register a function use sql ddl instead of api
here some questions:
1) all buitin function in flink will be register to shcema each job cycle.it's a ugly way
2) agg function such as sum,avg should matched by calcite,we can directly get the exact function
by aggCall instead of hard code

> FLINK SQL support create temporary function and table
> -----------------------------------------------------
>                 Key: FLINK-7151
>                 URL: https://issues.apache.org/jira/browse/FLINK-7151
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API & SQL
>            Reporter: yuemeng
> Based on create temporary function and table.we can register a udf,udaf,udtf use sql:
> {code}
> CREATE TEMPORARY 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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