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.dataflow.data.common;
  
  import org.apache.asterix.om.functions.BuiltinFunctions;
  import org.apache.asterix.om.functions.FunctionInfo;
  import org.apache.hyracks.algebricks.common.exceptions.AlgebricksException;
  import org.apache.hyracks.algebricks.core.algebra.base.ILogicalExpression;
  import org.apache.hyracks.algebricks.core.algebra.expressions.AbstractFunctionCallExpression;
  import org.apache.hyracks.algebricks.core.algebra.expressions.AggregateFunctionCallExpression;
  import org.apache.hyracks.algebricks.core.algebra.expressions.IPartialAggregationTypeComputer;
  import org.apache.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment;
  import org.apache.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
  import org.apache.hyracks.algebricks.core.algebra.metadata.IMetadataProvider;
  
  public class PartialAggregationTypeComputer implements IPartialAggregationTypeComputer {
  
      @Override
      public Object getType(ILogicalExpression expr, IVariableTypeEnvironment env,
              IMetadataProvider<?, ?> metadataProvider) throws AlgebricksException {
          AggregateFunctionCallExpression agg = (AggregateFunctionCallExpression) expr;
          FunctionIdentifier partialFid = agg.getFunctionIdentifier();
          if (partialFid.equals(BuiltinFunctions.SERIAL_GLOBAL_AVG)) {
              partialFid = BuiltinFunctions.SERIAL_LOCAL_AVG;
          }
          AggregateFunctionCallExpression partialAgg =
                  BuiltinFunctions.makeAggregateFunctionExpression(partialFid, agg.getArguments());
          return getTypeForFunction(partialAgg, env, metadataProvider);
      }
  
      private Object getTypeForFunction(AbstractFunctionCallExpression expr, IVariableTypeEnvironment env,
              IMetadataProvider<?, ?> metadataProvider) throws AlgebricksException {
          return ((FunctionInfo) expr.getFunctionInfo()).getResultTypeComputer().computeType(expr, env, metadataProvider);
      }
  }
  