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CoalesceFunction.scala
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CoalesceFunction.scala
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/*
* Copyright (c) 2002-2017 "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.compatibility.v3_3.runtime.commands.expressions
import org.neo4j.cypher.internal.compatibility.v3_3.runtime.ExecutionContext
import org.neo4j.cypher.internal.compatibility.v3_3.runtime.pipes.QueryState
import org.neo4j.cypher.internal.frontend.v3_3.symbols._
import org.neo4j.values.AnyValue
import org.neo4j.values.storable.Values
case class CoalesceFunction(arguments: Expression*) extends Expression {
def apply(ctx: ExecutionContext)(implicit state: QueryState): AnyValue =
arguments.
view.
map(expression => expression(ctx)).
find(value => value != Values.NO_VALUE) match {
case None => Values.NO_VALUE
case Some(x) => x
}
def innerExpectedType: Option[CypherType] = None
val argumentsString: String = children.mkString(",")
override def toString = "coalesce(" + argumentsString + ")"
def rewrite(f: (Expression) => Expression) = f(CoalesceFunction(arguments.map(e => e.rewrite(f)): _*))
def symbolTableDependencies = arguments.flatMap(_.symbolTableDependencies).toSet
}