plus
Combines this qualifier with the other.
If neither of the operands are EmptyQualifier, returns a MultiQualifier. If one or the other is an EmptyQualifier, returns the non-empty qualifier. If both are empty qualifiers, returns EmptyQualifier.
Combines this qualifier with the other.
If neither of the operands are EmptyQualifier, returns a MultiQualifier. If one or the other is an EmptyQualifier, returns the non-empty qualifier. If both are empty qualifiers, returns EmptyQualifier.