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https://issues.apache.org/jira/browse/FLINK-30129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17736000#comment-17736000
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Jun Qin commented on FLINK-30129:
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Thanks [~jark]
> Push projection through ChangelogNormalize
> ------------------------------------------
>
> Key: FLINK-30129
> URL: https://issues.apache.org/jira/browse/FLINK-30129
> Project: Flink
> Issue Type: New Feature
> Components: Table SQL / Planner
> Reporter: Jark Wu
> Assignee: Jark Wu
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.18.0
>
>
> Currently, the ChangelogNormalize node is generated during the physical
> optimization phase. That means the projection is not pushed through
> ChangelogNormalize if the {{TableSource}} doesn't support
> {{SupportsProjectionPushDown}}. We can implement such optimization to reduce
> the state size (fewer columns in state value) and better throughput (only
> changes on the selected columns will be emitted).
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