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https://issues.apache.org/jira/browse/CALCITE-5787?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rong Rong updated CALCITE-5787:
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Description:
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}}s.
- for each {{aggregateCall}}, we should include all fields used in {{argList}},
{{filterArg}}, {{distinctKeys}}, and {{collation}}.
see relative discussion in CALCITE-5740
> 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
>
> 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}}s.
> - 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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