forked from eldersantos/community
/
CountStar.scala
38 lines (32 loc) · 1.34 KB
/
CountStar.scala
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/**
* Copyright (c) 2002-2012 "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.commands.expressions
import org.neo4j.cypher.internal.symbols.{SymbolTable, CypherType, LongType}
import org.neo4j.cypher.internal.pipes.aggregation.CountStarFunction
case class CountStar() extends AggregationExpression {
def rewrite(f: (Expression) => Expression) = f(CountStar())
def createAggregationFunction = new CountStarFunction
def filter(f: (Expression) => Boolean) = if (f(this))
Seq(this)
else
Seq()
def calculateType(symbols: SymbolTable): CypherType = LongType()
def symbolTableDependencies = Set()
}