Function MustBeDStringOrDNull

pkg/sql/sem/tree/datum.go:1230–1236

MustBeDStringOrDNull attempts to retrieve a DString or DNull from an Expr, panicking if the assertion fails.

(e Expr)

// MustBeDStringOrDNull attempts to retrieve a DString or DNull from an Expr, panicking if the
// assertion fails.
func MustBeDStringOrDNull(e Expr) DString {
	i, ok := AsDString(e)
	if !ok && e != DNull {
		panic(errors.AssertionFailedf("expected *DString or DNull, found %T", e))
	}
	return i
}

// ResolvedType implements the TypedExpr interface.
func (*DString) ResolvedType() *types.T {