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