(namedColumnRef: StringAdd).self
(namedColumnRef: StringFormat).self
(namedColumnRef: ArrowAssoc[NamedColumnRef]).x
(Since version 2.10.0) Use leftOfArrow instead
(namedColumnRef: Ensuring[NamedColumnRef]).x
(Since version 2.10.0) Use resultOfEnsuring instead
References a column by name.