spark NullType 源码
spark NullType 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/types/NullType.scala
/*
* 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.Stable
/**
* The data type representing `NULL` values. Please use the singleton `DataTypes.NullType`.
*
* @since 1.3.0
*/
@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
override def typeName: String = "void"
}
/**
* @since 1.3.0
*/
@Stable
case object NullType extends NullType
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