spark DoubleType 源码

spark DoubleType 代码

文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/types/DoubleType.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.{Fractional, Numeric}
import scala.reflect.runtime.universe.typeTag
import scala.util.Try

import org.apache.spark.annotation.Stable
import org.apache.spark.sql.catalyst.util.SQLOrderingUtil

/**
 * The data type representing `Double` values. Please use the singleton `DataTypes.DoubleType`.
 *
 * @since 1.3.0
 */
@Stable
class DoubleType private() extends FractionalType {
  // The companion object and this class is separated so the companion object also subclasses
  // this type. Otherwise, the companion object would be of type "DoubleType$" in byte code.
  // Defined with a private constructor so the companion object is the only possible instantiation.
  private[sql] type InternalType = Double
  @transient private[sql] lazy val tag = typeTag[InternalType]
  private[sql] val numeric = implicitly[Numeric[Double]]
  private[sql] val fractional = implicitly[Fractional[Double]]
  private[sql] val ordering =
    (x: Double, y: Double) => SQLOrderingUtil.compareDoubles(x, y)
  private[sql] val asIntegral = DoubleType.DoubleAsIfIntegral

  override private[sql] def exactNumeric = DoubleExactNumeric

  /**
   * The default size of a value of the DoubleType is 8 bytes.
   */
  override def defaultSize: Int = 8

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

/**
 * @since 1.3.0
 */
@Stable
case object DoubleType extends DoubleType {

  // Traits below copied from Scala 2.12; not present in 2.13
  // TODO: SPARK-30011 revisit once Scala 2.12 support is dropped
  trait DoubleIsConflicted extends Numeric[Double] {
    def plus(x: Double, y: Double): Double = x + y
    def minus(x: Double, y: Double): Double = x - y
    def times(x: Double, y: Double): Double = x * y
    def negate(x: Double): Double = -x
    def fromInt(x: Int): Double = x.toDouble
    def toInt(x: Double): Int = x.toInt
    def toLong(x: Double): Long = x.toLong
    def toFloat(x: Double): Float = x.toFloat
    def toDouble(x: Double): Double = x
    // logic in Numeric base trait mishandles abs(-0.0)
    override def abs(x: Double): Double = math.abs(x)
    // Added from Scala 2.13; don't override to work in 2.12
    def parseString(str: String): Option[Double] =
      Try(java.lang.Double.parseDouble(str)).toOption

  }

  trait DoubleAsIfIntegral extends DoubleIsConflicted with Integral[Double] {
    def quot(x: Double, y: Double): Double = (BigDecimal(x) quot BigDecimal(y)).doubleValue
    def rem(x: Double, y: Double): Double = (BigDecimal(x) remainder BigDecimal(y)).doubleValue
  }

  object DoubleAsIfIntegral extends DoubleAsIfIntegral {
    override def compare(x: Double, y: Double): Int = java.lang.Double.compare(x, y)
  }
}

相关信息

spark 源码目录

相关文章

spark AbstractDataType 源码

spark ArrayType 源码

spark BinaryType 源码

spark BooleanType 源码

spark ByteType 源码

spark CalendarIntervalType 源码

spark CharType 源码

spark DataType 源码

spark DateType 源码

spark DayTimeIntervalType 源码