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https://issues.apache.org/jira/browse/FLINK-9484?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rong Rong updated FLINK-9484:
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Description:
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.
was:
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].
We are planning to implement the generic type inference / functioncatalog look
up in multiple phases. Detail tickets will be created.
> 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 API & SQL
> 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.
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