| /* |
| * Copyright 2009-2013 by The Regents of the University of California |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * you may obtain a copy of the License from |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package edu.uci.ics.asterix.om.typecomputer.impl; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import edu.uci.ics.asterix.common.exceptions.AsterixException; |
| import edu.uci.ics.asterix.om.typecomputer.base.IResultTypeComputer; |
| import edu.uci.ics.asterix.om.types.ARecordType; |
| import edu.uci.ics.asterix.om.types.AUnionType; |
| import edu.uci.ics.asterix.om.types.BuiltinType; |
| import edu.uci.ics.asterix.om.types.IAType; |
| import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.ILogicalExpression; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.metadata.IMetadataProvider; |
| |
| public class NonTaggedLocalAvgTypeComputer implements IResultTypeComputer { |
| |
| public static final NonTaggedLocalAvgTypeComputer INSTANCE = new NonTaggedLocalAvgTypeComputer(); |
| |
| @Override |
| public IAType computeType(ILogicalExpression expression, IVariableTypeEnvironment env, |
| IMetadataProvider<?, ?> metadataProvider) throws AlgebricksException { |
| List<IAType> unionList = new ArrayList<IAType>(); |
| unionList.add(BuiltinType.ANULL); |
| unionList.add(BuiltinType.ADOUBLE); |
| try { |
| return new ARecordType(null, new String[] { "sum", "count" }, new IAType[] { |
| new AUnionType(unionList, "OptionalDouble"), BuiltinType.AINT32 }, false); |
| } catch (AsterixException e) { |
| throw new AlgebricksException(e); |
| } |
| } |
| } |