BuildChildRequired returns the distribution that must be required of its given child in order to satisfy a required distribution.

BuildInvertedJoinLookupTableDistribution builds the Distribution that results from performing lookups of an inverted join, if that distribution can be statically determined.

BuildLookupJoinLookupTableDistribution builds and returns the Distribution of a lookup table in a lookup join if that distribution can be statically determined.

BuildProvided returns a specific distribution that the operator provides.

CanProvide returns true if the given operator returns rows that can satisfy the given required distribution.

GetDEnumAsStringFromConstantExpr returns the string representation of a DEnum ConstantExpr, if expr is such a ConstantExpr.