be/src/exprs/aggregate/aggregate_function_count_by_enum.cpp

// 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.
// This file is copied from
// https://github.com/ClickHouse/ClickHouse/blob/master/src/AggregateFunctions/AggregateFunctionCount.cpp
// and modified by Doris

#include "exprs/aggregate/aggregate_function_count_by_enum.h"

#include "core/types.h"
#include "exprs/aggregate/aggregate_function_simple_factory.h"
#include "exprs/aggregate/factory_helpers.h"
#include "exprs/aggregate/helpers.h"

namespace doris {
#include "common/compile_check_begin.h"

AggregateFunctionPtr create_aggregate_function_count_by_enum(const std::string& name,
                                                             const DataTypes& argument_types,
                                                             const DataTypePtr& result_type,
                                                             const bool result_is_nullable,
                                                             const AggregateFunctionAttr& attr) {
    assert_arity_range(name, argument_types, 1, 1024);

    const auto* type = argument_types[0].get();
    if (type->is_nullable()) {
        type = assert_cast<const DataTypeNullable*>(type)->get_nested_type().get();
    }

    if (is_string_type(type->get_primitive_type())) {
        return std::make_shared<AggregateFunctionCountByEnum<AggregateFunctionCountByEnumData>>(
                argument_types);
    }

    LOG(WARNING) << fmt::format("unsupported input type {} for aggregate function {}",
                                argument_types[0]->get_name(), name);
    return nullptr;
}

void register_aggregate_function_count_by_enum(AggregateFunctionSimpleFactory& factory) {
    factory.register_function("count_by_enum", create_aggregate_function_count_by_enum, true);
    factory.register_function("count_by_enum", create_aggregate_function_count_by_enum, false);
}

} // namespace doris