spark Iterators 源码

2022-10-20
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spark Iterators 代码

文件路径：/core/src/main/scala-2.12/org/apache/spark/util/Iterators.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.util

object Iterators {

  /**
   * Counts the number of elements of an iterator using a while loop rather than calling
   * [[scala.collection.Iterator#size]] because it uses a for loop, which is slightly slower
   * in the current version of Scala.
   */
  def size(iterator: Iterator[_]): Long = {
    var count = 0L
    while (iterator.hasNext) {
      count += 1L
      iterator.next()
    }
    count
  }
}

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