package org.apache.spark.sql.catalyst.expressions

abstract class Attribute extends ... {
  // only required properties (vals and methods) that have no implementation
  // the others follow
  def withMetadata(newMetadata: Metadata): Attribute
  def withName(newName: String): Attribute
  def withNullability(newNullability: Boolean): Attribute
  def withQualifier(newQualifier: Option[String]): Attribute
  def newInstance(): Attribute
}