[jira] [Updated] (CALCITE-5787) The RelMdInputFieldsUsed is introduced to track the usage of input fields

["Zhen Chen (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-5787?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zhen Chen updated CALCITE-5787:
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    Summary: The RelMdInputFieldsUsed is introduced to track the usage of input fields  (was: The RelMdInputFieldsUsed keyword is introduced to track the usage of input fields)

> 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
>            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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