content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 at
   *
   *   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 org.apache.asterix.om.typecomputer.impl;
  
  import org.apache.asterix.om.types.ATypeTag;
  import org.apache.asterix.om.types.AUnionType;
  import org.apache.asterix.om.types.BuiltinType;
  import org.apache.asterix.om.types.IAType;
  import org.apache.hyracks.algebricks.common.exceptions.AlgebricksException;
  import org.apache.hyracks.algebricks.core.algebra.base.ILogicalExpression;
  
  public class NumericSumAggTypeComputer extends AggregateResultTypeComputer {
      public static final NumericSumAggTypeComputer INSTANCE = new NumericSumAggTypeComputer();
  
      private NumericSumAggTypeComputer() {
      }
  
      @Override
      protected IAType getResultType(ILogicalExpression expr, IAType... strippedInputTypes) throws AlgebricksException {
          ATypeTag tag = strippedInputTypes[0].getTypeTag();
          switch (tag) {
              case TINYINT:
              case SMALLINT:
              case INTEGER:
              case BIGINT:
                  return AUnionType.createNullableType(BuiltinType.AINT64);
              case FLOAT:
              case DOUBLE:
                  return AUnionType.createNullableType(BuiltinType.ADOUBLE);
              case ANY:
                  return BuiltinType.ANY;
              default:
                  // All other possible cases.
                  return BuiltinType.ANULL;
          }
  
      }
  }
  