text: // 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.
  
  #include "vec/aggregate_functions/aggregate_function_min_max.h"
  
  #include "vec/aggregate_functions/aggregate_function_simple_factory.h"
  #include "vec/aggregate_functions/factory_helpers.h"
  #include "vec/aggregate_functions/helpers.h"
  
  namespace doris::vectorized {
  
  namespace {
  
  /// min, max
  template <template <typename, bool> class AggregateFunctionTemplate, template <typename> class Data>
  static IAggregateFunction* create_aggregate_function_single_value(const String& name,
                                                                    const DataTypes& argument_types,
                                                                    const Array& parameters) {
      assert_no_parameters(name, parameters);
      assert_unary(name, argument_types);
  
      const DataTypePtr& argument_type = argument_types[0];
  
      WhichDataType which(argument_type);
  #define DISPATCH(TYPE)                                                                 \
      if (which.idx == TypeIndex::TYPE)                                                  \
          return new AggregateFunctionTemplate<Data<SingleValueDataFixed<TYPE>>, false>( \
                  argument_type);
      FOR_NUMERIC_TYPES(DISPATCH)
  #undef DISPATCH
      if (which.idx == TypeIndex::String) {
          return new AggregateFunctionTemplate<Data<SingleValueDataString>, false>(argument_type);
      }
      if (which.idx == TypeIndex::DateTime || which.idx == TypeIndex::Date) {
          return new AggregateFunctionTemplate<Data<SingleValueDataFixed<Int64>>, false>(argument_type);
      }
      if (which.idx == TypeIndex::Decimal128) {
          return new AggregateFunctionTemplate<Data<SingleValueDataFixed<DecimalV2Value>>, false>(argument_type);
      }
      return nullptr;
  }
  
  AggregateFunctionPtr create_aggregate_function_max(const std::string& name,
                                                     const DataTypes& argument_types,
                                                     const Array& parameters,
                                                     const bool result_is_nullable) {
      return AggregateFunctionPtr(
              create_aggregate_function_single_value<AggregateFunctionsSingleValue,
                                                     AggregateFunctionMaxData>(name, argument_types,
                                                                               parameters));
  }
  
  AggregateFunctionPtr create_aggregate_function_min(const std::string& name,
                                                     const DataTypes& argument_types,
                                                     const Array& parameters,
                                                     const bool result_is_nullable) {
      return AggregateFunctionPtr(
              create_aggregate_function_single_value<AggregateFunctionsSingleValue,
                                                     AggregateFunctionMinData>(name, argument_types,
                                                                               parameters));
  }
  
  } // namespace
  
  void register_aggregate_function_minmax(AggregateFunctionSimpleFactory& factory) {
      factory.register_function("max", create_aggregate_function_max);
      factory.register_function("min", create_aggregate_function_min);
  }
  
  } // namespace doris::vectorized