org.neo4j.cypher.internal.logical.plans.ConditionalApply.scala Maven / Gradle / Ivy

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Cypher logical plans

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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.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 .
 */
package org.neo4j.cypher.internal.logical.plans

import org.neo4j.cypher.internal.util.attribution.IdGen

/**
 * This is a variation of apply, which only executes 'right' if all variables in 'items' != NO_VALUE.
 *
 * for ( leftRow <- left ) {
 *   if ( condition( leftRow ) ) {
 *     produce leftRow
 *   } else {
 *     right.setArgument( leftRow )
 *     for ( rightRow <- right ) {
 *       produce rightRow
 *     }
 *   }
 * }
 */
case class ConditionalApply(override val left: LogicalPlan, override val right: LogicalPlan, items: Seq[String])
                           (implicit idGen: IdGen) extends LogicalBinaryPlan(idGen) with ApplyPlan {

  override def withLhs(newLHS: LogicalPlan)(idGen: IdGen): LogicalBinaryPlan = copy(left = newLHS)(idGen)
  override def withRhs(newRHS: LogicalPlan)(idGen: IdGen): LogicalBinaryPlan = copy(right = newRHS)(idGen)

  override val availableSymbols: Set[String] = left.availableSymbols ++ right.availableSymbols ++ items
}