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https://issues.apache.org/jira/browse/CALCITE-4925?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Will Noble reassigned CALCITE-4925:
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Assignee: Will Noble
> AggregateReduceFunctionsRule should accept arbitrary predicates
> ---------------------------------------------------------------
>
> Key: CALCITE-4925
> URL: https://issues.apache.org/jira/browse/CALCITE-4925
> Project: Calcite
> Issue Type: Improvement
> Reporter: Will Noble
> Assignee: Will Noble
> Priority: Minor
>
> `AggregateReduceFunctionsRule` allows you to specify which functions to
> reduce, but only allows you to specify by function type. For instance, you
> can either reduce all {{SUM}} functions, or no {{SUM}} functions, but not a
> subset of {{SUM}} functions (say, only the {{SUM}} functions with distinct
> keys). Allowing the user to specify an arbitrary predicate would allow us to
> selective apply the rule to functions without distinct keys, which matters in
> Looker due to the fact that distinct keys cause an aggregate to be impossible
> to roll up, and when that's the case, we'd like to avoid reducing the
> functions for the purpose of aggregate awareness.
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