org.apache.spark.sql.types.NullType.scala Maven / Gradle / Ivy

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.spark.sql.types

import org.apache.spark.annotation.InterfaceStability


/**
 * The data type representing `NULL` values. Please use the singleton `DataTypes.NullType`.
 *
 * @since 1.3.0
 */
@InterfaceStability.Stable
class NullType private() extends DataType {
  // The companion object and this class is separated so the companion object also subclasses
  // this type. Otherwise, the companion object would be of type "NullType$" in byte code.
  // Defined with a private constructor so the companion object is the only possible instantiation.
  override def defaultSize: Int = 1

  private[spark] override def asNullable: NullType = this
}

/**
 * @since 1.3.0
 */
@InterfaceStability.Stable
case object NullType extends NullType