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https://issues.apache.org/jira/browse/CALCITE-5787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18041483#comment-18041483
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Zhen Chen commented on CALCITE-5787:
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I've updated the PR. Could you please review it and see if it aligns with our
previous discussion?
> Add interface in RelNode for getInputFieldsUsed
> -----------------------------------------------
>
> Key: CALCITE-5787
> URL: https://issues.apache.org/jira/browse/CALCITE-5787
> Project: Calcite
> Issue Type: New Feature
> Reporter: Rong Rong
> Priority: Major
> Labels: pull-request-available
>
> It would be super useful to detect all the input fields used in a {{RelNode}}
> to indicate what's being used from the inputs.
> We have a similar utility to find all input fields referenced for a
> {{RexNode}} via {{RelOptUtil.InputFinder}}. For a relation we can do one step
> further to automatically keep track of all the relevant relations.
> For example,
> - {{Aggregate}} relations: {{RelNode.getInputFieldsUsed}} should return a
> union of the input fields used by {{groupSet}} and all {{aggregateCall}}
> - for each {{aggregateCall}}, we should include all fields used in
> {{{}argList{}}}, {{{}filterArg{}}}, {{{}distinctKeys{}}}, and
> {{{}collation{}}}.
> see relative discussion in CALCITE-5740
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