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Support identifying when an aggregate function is duplicate-insensitive #22644

@neilconway

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@neilconway

Is your feature request related to a problem or challenge?

For #22594, it would be helpful to know when an aggregate function is duplicate-insensitive; of the built-in aggregates, at least min, max, bit_and, bit_or, bool_and, bool_or, and probably first_value / last_value.

This might also be helpful for other query optimization passes.

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