Function AsDString

pkg/sql/sem/tree/datum.go:1208–1216

AsDString attempts to retrieve a DString from an Expr, returning a DString and a flag signifying whether the assertion was successful. The function should be used instead of direct type assertions wherever a *DString wrapped by a *DOidWrapper is possible.

(e Expr)

// be used instead of direct type assertions wherever a *DString wrapped by a
// *DOidWrapper is possible.
func AsDString(e Expr) (DString, bool) {
	switch t := e.(type) {
	case *DString:
		return *t, true
	case *DOidWrapper:
		return AsDString(t.Wrapped)
	}
	return "", false
}

// MustBeDString attempts to retrieve a DString from an Expr, panicking if the
// assertion fails.