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ForeachApply.scala
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ForeachApply.scala
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/*
* Copyright (c) 2002-2018 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.cypher.internal.v3_5.logical.plans
import org.opencypher.v9_0.expressions.Expression
import org.opencypher.v9_0.util.attribution.IdGen
/**
* ForeachApply is a side-effect type apply, which operates on a list value. Each left row is used to compute a
* list, and each value in this list applied as the argument to right. Left rows are produced unchanged.
*
* for ( leftRow <- left)
* list <- expression.evaluate( leftRow )
* for ( value <- list )
* right.setArgument( value )
* for ( rightRow <- right )
* // just consume
*
* produce leftRow
*/
case class ForeachApply(left: LogicalPlan, right: LogicalPlan, variable: String, expression: Expression)(implicit idGen: IdGen)
extends LogicalPlan(idGen) with LazyLogicalPlan {
val lhs = Some(left)
val rhs = Some(right)
override val availableSymbols: Set[String] = left.availableSymbols // NOTE: right.availableSymbols and variable are not available outside
}