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From: andrewor14 <git@git.apache.org>
To: reviews@spark.apache.org
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References: <git-pr-8573-spark@git.apache.org>
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Subject: [GitHub] spark pull request:
 [SPARK-9992][SPARK-9994][SPARK-9998][SQL]Imple...
Content-Type: text/plain
Message-Id: <20150910195046.2901BE0F7F@git1-us-west.apache.org>
Date: Thu, 10 Sep 2015 19:50:46 +0000 (UTC)

Github user andrewor14 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/8573#discussion_r39204999
  
    --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/local/IntersectNode.scala ---
    @@ -0,0 +1,61 @@
    +/*
    +* 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.execution.local
    +
    +import scala.collection.mutable
    +
    +import org.apache.spark.sql.catalyst.InternalRow
    +import org.apache.spark.sql.catalyst.expressions.Attribute
    +
    +case class IntersectNode(left: LocalNode, right: LocalNode) extends BinaryLocalNode {
    +
    +  override def output: Seq[Attribute] = left.output
    +
    +  private[this] var leftRows: mutable.HashSet[InternalRow] = _
    +
    +  private[this] var currentRow: InternalRow = _
    +
    +  override def open(): Unit = {
    +    left.open()
    +    leftRows = mutable.HashSet[InternalRow]()
    +    while (left.next()) {
    +      leftRows += left.fetch().copy()
    +    }
    +    left.close()
    +    right.open()
    +  }
    +
    +  override def next(): Boolean = {
    +    currentRow = null
    +    while (currentRow == null && right.next()) {
    +      currentRow = right.fetch()
    +      if (!leftRows.contains(currentRow)) {
    +        currentRow = null
    +      }
    +    }
    --- End diff --
    
    can this be:
    ```
    currentRow = null
    while (!leftRows.contains(currentRow) && right.next()) {
      currentRow = right.fetch()
    }
    ```


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