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https://issues.apache.org/jira/browse/FLINK-36093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17898122#comment-17898122
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Leonard Xu commented on FLINK-36093:
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master:5db16ba30ce40d52cb5d76fcdce18a10da1c4cad
3.2: TODO
> PreTransform operator wrongly filters out columns when multiple transform
> rules were defined
> --------------------------------------------------------------------------------------------
>
> Key: FLINK-36093
> URL: https://issues.apache.org/jira/browse/FLINK-36093
> Project: Flink
> Issue Type: Improvement
> Components: Flink CDC
> Reporter: yux
> Assignee: MOBIN
> Priority: Major
> Labels: pull-request-available
>
> Currently, such transform rule could not work:
> ```yaml
> transform:
> - projection: 'A' as result
> filter: tag >= 0
> - projection: score as result
> filter: tag < 0
> ```
> Here, `score` column will be filtered out in PreTransform stage, since it
> wasn't referenced in the first transform rule. As a result, the following
> transform rule will fail since `score` does not exist in PostTransform
> operator.
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