spark DateType 源码
spark DateType 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/types/DateType.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 scala.math.Ordering
import scala.reflect.runtime.universe.typeTag
import org.apache.spark.annotation.Stable
/**
* The date type represents a valid date in the proleptic Gregorian calendar.
* Valid range is [0001-01-01, 9999-12-31].
*
* Please use the singleton `DataTypes.DateType` to refer the type.
* @since 1.3.0
*/
@Stable
class DateType private() extends DatetimeType {
/**
* Internally, a date is stored as a simple incrementing count of days
* where day 0 is 1970-01-01. Negative numbers represent earlier days.
*/
private[sql] type InternalType = Int
@transient private[sql] lazy val tag = typeTag[InternalType]
private[sql] val ordering = implicitly[Ordering[InternalType]]
/**
* The default size of a value of the DateType is 4 bytes.
*/
override def defaultSize: Int = 4
private[spark] override def asNullable: DateType = this
}
/**
* The companion case object and the DateType class is separated so the companion object
* also subclasses the class. Otherwise, the companion object would be of type "DateType$"
* in byte code. The DateType class is defined with a private constructor so its companion
* object is the only possible instantiation.
*
* @since 1.3.0
*/
@Stable
case object DateType extends DateType
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