org.apache.spark.sql.execution.local.ProjectNode.scala Maven / Gradle / Ivy

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/*
* 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,
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package org.apache.spark.sql.execution.local

import org.apache.spark.sql.SQLConf
import org.apache.spark.sql.catalyst.InternalRow
import org.apache.spark.sql.catalyst.expressions.{UnsafeProjection, Attribute, NamedExpression}


case class ProjectNode(conf: SQLConf, projectList: Seq[NamedExpression], child: LocalNode)
  extends UnaryLocalNode(conf) {

  private[this] var project: UnsafeProjection = _

  override def output: Seq[Attribute] = projectList.map(_.toAttribute)

  override def open(): Unit = {
    project = UnsafeProjection.create(projectList, child.output)
    child.open()
  }

  override def next(): Boolean = child.next()

  override def fetch(): InternalRow = {
    project.apply(child.fetch())
  }

  override def close(): Unit = child.close()
}