be/src/vec/aggregate_functions/aggregate_function_topn.cpp

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// to you under the Apache License, Version 2.0 (the
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// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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#include "vec/aggregate_functions/aggregate_function_topn.h"

#include <fmt/format.h>
#include <glog/logging.h>

#include "runtime/define_primitive_type.h"
#include "vec/aggregate_functions/helpers.h"
#include "vec/data_types/data_type.h"

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

AggregateFunctionPtr create_aggregate_function_topn(const std::string& name,
                                                    const DataTypes& argument_types,
                                                    const DataTypePtr& result_type,
                                                    const bool result_is_nullable,
                                                    const AggregateFunctionAttr& attr) {
    if (argument_types.size() == 2) {
        return creator_without_type::create<AggregateFunctionTopN<AggregateFunctionTopNImplInt>>(
                argument_types, result_is_nullable, attr);
    } else if (argument_types.size() == 3) {
        return creator_without_type::create<AggregateFunctionTopN<AggregateFunctionTopNImplIntInt>>(
                argument_types, result_is_nullable, attr);
    }
    return nullptr;
}

template <PrimitiveType T>
using ImplArray = AggregateFunctionTopNImplArray<T, false>;
template <PrimitiveType T>
using ImplArrayWithDefault = AggregateFunctionTopNImplArray<T, true>;

using creator =
        creator_with_type_list<TYPE_TINYINT, TYPE_SMALLINT, TYPE_INT, TYPE_BIGINT, TYPE_LARGEINT,
                               TYPE_FLOAT, TYPE_DOUBLE, TYPE_DECIMAL32, TYPE_DECIMAL64,
                               TYPE_DECIMAL128I, TYPE_DECIMAL256, TYPE_VARCHAR, TYPE_DATEV2,
                               TYPE_DATETIMEV2, TYPE_TIMESTAMPTZ, TYPE_IPV4, TYPE_IPV6>;

AggregateFunctionPtr create_aggregate_function_topn_array(const std::string& name,
                                                          const DataTypes& argument_types,
                                                          const DataTypePtr& result_type,
                                                          const bool result_is_nullable,
                                                          const AggregateFunctionAttr& attr) {
    bool has_default_param = (argument_types.size() == 3);
    if (has_default_param) {
        return creator::create<AggregateFunctionTopNArray, ImplArrayWithDefault>(
                argument_types, result_is_nullable, attr);
    } else {
        return creator::create<AggregateFunctionTopNArray, ImplArray>(argument_types,
                                                                      result_is_nullable, attr);
    }
}

template <PrimitiveType T>
using ImplWeight = AggregateFunctionTopNImplWeight<T, false>;
template <PrimitiveType T>
using ImplWeightWithDefault = AggregateFunctionTopNImplWeight<T, true>;

AggregateFunctionPtr create_aggregate_function_topn_weighted(const std::string& name,
                                                             const DataTypes& argument_types,
                                                             const DataTypePtr& result_type,
                                                             const bool result_is_nullable,
                                                             const AggregateFunctionAttr& attr) {
    bool has_default_param = (argument_types.size() == 4);
    if (has_default_param) {
        return creator::create<AggregateFunctionTopNArray, ImplWeightWithDefault>(
                argument_types, result_is_nullable, attr);
    } else {
        return creator::create<AggregateFunctionTopNArray, ImplWeight>(argument_types,
                                                                       result_is_nullable, attr);
    }
}

void register_aggregate_function_topn(AggregateFunctionSimpleFactory& factory) {
    factory.register_function_both("topn", create_aggregate_function_topn);
    factory.register_function_both("topn_array", create_aggregate_function_topn_array);
    factory.register_function_both("topn_weighted", create_aggregate_function_topn_weighted);
}

} // namespace doris::vectorized