[
https://issues.apache.org/jira/browse/FLINK-9484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17337049#comment-17337049
]
Leonard Xu commented on FLINK-9484:
-----------------------------------
I found this improvement has been implemented in FLIP-65, I close this ticket.
Please open new ticket if you found anything is not supported yet.
> Improve generic type inference for User-Defined Functions
> ---------------------------------------------------------
>
> Key: FLINK-9484
> URL: https://issues.apache.org/jira/browse/FLINK-9484
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / API
> Reporter: Rong Rong
> Assignee: Rong Rong
> Priority: Major
>
> User-defined function has been a great extension for Flink SQL API to support
> much complex logics.
> We experienced many inconvenience when dealing with UDF with generic types
> and are summarized in the following
> [doc|https://docs.google.com/document/d/1zKSY1z0lvtQdfOgwcLnCMSRHew3weeJ6QfQjSD0zWas/edit?usp=sharing].
> Detail implementation plans are listed in sub-tasks for the generic type
> inference / functioncatalog look up.
> In discussion topic: Can we optimize codegen while provide flexibility for
> output type generic, by the method in FLINK-9430 to chaining: generic result
> type UDF function with CAST operator.
> Initial thought here is to add an logical plan optimizer rule to create a
> UDFGenericResultTypeCast operator.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
