Trait alias to represent an expression that isn’t aggregate by default.
This trait should never be implemented directly. It is replaced with a
trait alias when the
unstable feature is enabled.
This alias represents a type which is not aggregate if there is no group by
clause. More specifically, it represents for types which implement
While this trait is a useful stand-in for common cases,
cannot always be used when
T: ValidGrouping<(), IsAggregate = No> or
T: ValidGrouping<(), IsAggregate = Never> could be. For that reason,
unless you need to abstract over both columns and literals, you should
prefer to use
ValidGrouping<()> in your bounds instead.