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https://issues.apache.org/jira/browse/FLINK-39708?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Fabian Hueske resolved FLINK-39708.
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Fix Version/s: 2.4.0
Resolution: Implemented
> Support TO_CHANGELOG retract/upsert stream -> upsert stream with set semantics
> ------------------------------------------------------------------------------
>
> Key: FLINK-39708
> URL: https://issues.apache.org/jira/browse/FLINK-39708
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / API
> Reporter: Gustavo de Morais
> Assignee: Gustavo de Morais
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.4.0
>
>
> Extend {{TO_CHANGELOG}} so that, when called with {{PARTITION BY}} on an
> upsert or retract input, it can emit an upsert stream instead of always
> forcing retract semantics.
> The output shape is controlled by {{{}op_mapping{}}}:
> * {{op_mapping}} omits {{UPDATE_BEFORE}} → output is an upsert stream; the
> planner skips the {{ChangelogNormalize}} step that would otherwise
> materialize {{UPDATE_BEFORE}} rows.
> * {{op_mapping}} omits {{DELETE}} → the planner skips the
> full-{{{}DELETE{}}} materialization step in {{ChangelogNormalize}} (key-only
> deletes flow through, matching sources like Flink's {{upsert-kafka}}
> connector).
> * {{op_mapping}} includes both → retract as default
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