// be true if it is known the column may be null, or false if the column is known
// to be not nullable.
// If the column nullability is unknown, ok should be false.
type RowsColumnTypeNullable interface {
	Rows
	ColumnTypeNullable(index int) (nullable, ok bool)
}

// RowsColumnTypePrecisionScale may be implemented by [Rows]. It should return
// the precision and scale for decimal types. If not applicable, ok should be false.