func (r *RowNumber) Resolved() bool {
	return windowResolved(r.window)
}
IsNullable implements sql.Expression
package window
import (
	"sort"
	"strings"
	"github.com/dolthub/go-mysql-server/sql/expression"
	"github.com/dolthub/go-mysql-server/sql"
)
type RowNumber struct {
	window *sql.Window
	pos    int
}
var _ sql.FunctionExpression = (*RowNumber)(nil)
var _ sql.WindowAggregation = (*RowNumber)(nil)
func NewRowNumber() sql.Expression {
	return &RowNumber{}
}
func (r *RowNumber) Window() *sql.Window {
	return r.window
}