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.typecomputer.base.AbstractResultTypeComputer;
  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;
  
  /**
   * Returns double if both operands are integers
   */
  public class NumericDivideTypeComputer extends AbstractResultTypeComputer {
      public static final NumericDivideTypeComputer INSTANCE = new NumericDivideTypeComputer();
  
      private NumericDivideTypeComputer() {
      }
  
      @Override
      protected IAType getResultType(ILogicalExpression expr, IAType... strippedInputTypes) throws AlgebricksException {
          IAType t1 = strippedInputTypes[0];
          IAType t2 = strippedInputTypes[1];
          ATypeTag tag1 = t1.getTypeTag();
          ATypeTag tag2 = t2.getTypeTag();
  
          IAType type;
          switch (tag1) {
              case DOUBLE:
                  switch (tag2) {
                      case TINYINT:
                      case SMALLINT:
                      case INTEGER:
                      case BIGINT:
                      case FLOAT:
                      case DOUBLE:
                          type = BuiltinType.ADOUBLE;
                          break;
                      case ANY:
                          type = BuiltinType.ANY;
                          break;
                      default:
                          return BuiltinType.ANULL;
                  }
                  break;
              case FLOAT:
                  switch (tag2) {
                      case TINYINT:
                      case SMALLINT:
                      case INTEGER:
                      case BIGINT:
                      case FLOAT:
                          type = BuiltinType.AFLOAT;
                          break;
                      case DOUBLE:
                          type = BuiltinType.ADOUBLE;
                          break;
                      case ANY:
                          type = BuiltinType.ANY;
                          break;
                      default:
                          return BuiltinType.ANULL;
                  }
                  break;
              case BIGINT:
              case INTEGER:
              case SMALLINT:
              case TINYINT:
                  switch (tag2) {
                      case TINYINT:
                      case SMALLINT:
                      case INTEGER:
                      case BIGINT:
                      case DOUBLE:
                          type = BuiltinType.ADOUBLE;
                          break;
                      case FLOAT:
                          type = BuiltinType.AFLOAT;
                          break;
                      case ANY:
                          type = BuiltinType.ANY;
                          break;
                      default:
                          return BuiltinType.ANULL;
                  }
                  break;
              case ANY:
                  switch (tag2) {
                      case TINYINT:
                      case SMALLINT:
                      case INTEGER:
                      case BIGINT:
                      case FLOAT:
                      case ANY:
                      case DOUBLE:
                          type = BuiltinType.ANY;
                          break;
                      default:
                          return BuiltinType.ANULL;
                  }
                  break;
              default:
                  return BuiltinType.ANULL;
          }
  
          if (type.getTypeTag() != ATypeTag.ANY) {
              // returns NULL if division by 0
              type = AUnionType.createNullableType(type);
          }
  
          return type;
      }
  }
  