org.neo4j.cypher.internal.logical.plans.AssertSameNode.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

/**
 * For every row in left, assert that all rows in right produce the same value
 * for the variable IdName. Produce the rows from left.
 *
 * for ( leftRow <- left )
 *   for ( rightRow <- right )
 *     assert( leftRow(node) == rightRow(node) )
 *   produce leftRow
 *
 * This operator is planned for merges using unique index seeks.
 */
case class AssertSameNode(node: String, override val left: LogicalPlan, override val right: LogicalPlan)(implicit idGen: IdGen) extends LogicalBinaryPlan(idGen) {

  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 + node
}