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https://issues.apache.org/jira/browse/CALCITE-4143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17166160#comment-17166160
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liupengcheng commented on CALCITE-4143:
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[~Aron.tao] Can you give an example? I don't think the filter column can be
pruned if it's originally based on a project, even if it's been pushed down,
as the filter expression relies on the return row types of the underlying
project.
Also I aggree with [~julianhyde], a rule don't trim fields or columns, do you
mean the project push down?
> Trim fields after XXProjectTransposeRule
> ----------------------------------------
>
> Key: CALCITE-4143
> URL: https://issues.apache.org/jira/browse/CALCITE-4143
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Jiatao Tao
> Assignee: Jiatao Tao
> Priority: Major
>
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