org.apache.spark.sql.execution.local.SeqScanNode.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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* See the License for the specific language governing permissions and
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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.Attribute

/**
 * An operator that scans some local data collection in the form of Scala Seq.
 */
case class SeqScanNode(conf: SQLConf, output: Seq[Attribute], data: Seq[InternalRow])
  extends LeafLocalNode(conf) {

  private[this] var iterator: Iterator[InternalRow] = _
  private[this] var currentRow: InternalRow = _

  override def open(): Unit = {
    iterator = data.iterator
  }

  override def next(): Boolean = {
    if (iterator.hasNext) {
      currentRow = iterator.next()
      true
    } else {
      false
    }
  }

  override def fetch(): InternalRow = currentRow

  override def close(): Unit = {
    // Do nothing
  }
}