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From: davies <git@git.apache.org>
To: reviews@spark.apache.org
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Subject: [GitHub] spark pull request: [SPARK-13306] [SQL] uncorrelated scalar
 subque...
Content-Type: text/plain
Message-Id: <20160220071742.81882E0104@git1-us-west.apache.org>
Date: Sat, 20 Feb 2016 07:17:42 +0000 (UTC)

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

    https://github.com/apache/spark/pull/11190#discussion_r53546398
  
    --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/subquery.scala ---
    @@ -0,0 +1,81 @@
    +/*
    + * 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.catalyst.expressions
    +
    +import org.apache.spark.sql.catalyst.analysis.TypeCheckResult
    +import org.apache.spark.sql.catalyst.plans.QueryPlan
    +import org.apache.spark.sql.catalyst.plans.logical.{LogicalPlan, Subquery}
    +import org.apache.spark.sql.types.DataType
    +
    +/**
    + * An interface for subquery that is used in expressions.
    + */
    +abstract class SubqueryExpression extends LeafExpression{
    +
    +  /**
    +   * The logical plan of the query.
    +   */
    +  def query: LogicalPlan
    +
    +  /**
    +   * The underline plan for the query, could be logical plan or physical plan.
    +   *
    +   * This is used to generate tree string.
    +   */
    +  def plan: QueryPlan[_]
    +
    +  /**
    +   * Updates the query with new logical plan.
    +   */
    +  def withNewPlan(plan: LogicalPlan): SubqueryExpression
    --- End diff --
    
    We will have ExistsSubquery, InSubquery shortly (or next release). 


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