spark TimestampType 源码
spark TimestampType 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/types/TimestampType.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 timestamp type represents a time instant in microsecond precision.
* Valid range is [0001-01-01T00:00:00.000000Z, 9999-12-31T23:59:59.999999Z] where
* the left/right-bound is a date and time of the proleptic Gregorian
* calendar in UTC+00:00.
*
* Please use the singleton `DataTypes.TimestampType` to refer the type.
* @since 1.3.0
*/
@Stable
class TimestampType private() extends DatetimeType {
/**
* Internally, a timestamp is stored as the number of microseconds from
* the epoch of 1970-01-01T00:00:00.000000Z (UTC+00:00)
*/
private[sql] type InternalType = Long
@transient private[sql] lazy val tag = typeTag[InternalType]
private[sql] val ordering = implicitly[Ordering[InternalType]]
/**
* The default size of a value of the TimestampType is 8 bytes.
*/
override def defaultSize: Int = 8
private[spark] override def asNullable: TimestampType = this
}
/**
* The companion case object and its class is separated so the companion object also subclasses
* the TimestampType class. Otherwise, the companion object would be of type "TimestampType$"
* in byte code. Defined with a private constructor so the companion object is the only possible
* instantiation.
*
* @since 1.3.0
*/
@Stable
case object TimestampType extends TimestampType
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