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https://issues.apache.org/jira/browse/FLINK-31788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17761219#comment-17761219
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Jane Chan commented on FLINK-31788:
-----------------------------------
Sorry for just noticing this issue now. This problem should be a feature
rollback when deprecating the old planner since 1.15. The method
`emitUpdateWithRetract` was not called in the codegen, but the [user-defined
table agg func
doc|https://nightlies.apache.org/flink/flink-docs-release-1.17/docs/dev/table/functions/udfs/#retraction-example]
still gives the retract example that evaluates this method.
{quote}Jark: I'm wondering why it is not found for so many years. Does it mean
users rarely use it?
{quote}
IMO, we can evaluate whether users still need this feature versus the cost of
fixing it. If we no longer intend to support this method, we can open a
discussion to deprecate it. Alternatively, it's reasonable to add it back.
> Add back Support emitValueWithRetract for TableAggregateFunction
> ----------------------------------------------------------------
>
> Key: FLINK-31788
> URL: https://issues.apache.org/jira/browse/FLINK-31788
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Reporter: Feng Jin
> Priority: Major
>
> This feature was originally implemented in the old planner:
> [https://github.com/apache/flink/pull/8550/files]
> However, this feature was not implemented in the new planner , the Blink
> planner.
> With the removal of the old planner in version 1.14
> [https://github.com/apache/flink/pull/16080] , this code was also removed.
>
> We should add it back.
>
> origin discuss link:
> https://lists.apache.org/thread/rnvw8k3636dqhdttpmf1c9colbpw9svp
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