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https://issues.apache.org/jira/browse/CALCITE-5787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18053755#comment-18053755
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Zhen Chen commented on CALCITE-5787:
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While I will utilize some AI assistance, I want to clarify that this code
reflects my initial understanding, and therefore, I believe there was a
misunderstanding on my part. My initial understanding was that I needed to
retrieve the indices from the inputs; for example, in the join you mentioned, I
intended to obtain two bitsets, namely \{...} and \{0}, not \{..., 7}. However,
after confirming with you again and reconfirming the requirements in the
SemiJoinRule, I realized my misunderstanding. Therefore, I have proposed a
modification; would you find it acceptable? I believe this issue was indeed
caused by insufficient communication, and I apologize again.
> The RelMdInputFieldsUsed is introduced to track the usage of input fields
> -------------------------------------------------------------------------
>
> Key: CALCITE-5787
> URL: https://issues.apache.org/jira/browse/CALCITE-5787
> Project: Calcite
> Issue Type: New Feature
> Reporter: Rong Rong
> Assignee: Zhen Chen
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.42.0
>
>
> 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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