Will Noble created CALCITE-4925:
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Summary: 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
`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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