be/src/vec/aggregate_functions/aggregate_function_stddev.cpp

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// to you under the Apache License, Version 2.0 (the
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//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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#include "vec/aggregate_functions/aggregate_function_stddev.h"

#include <fmt/format.h>

#include <string>

#include "vec/aggregate_functions/aggregate_function_simple_factory.h"
#include "vec/aggregate_functions/helpers.h"
#include "vec/data_types/data_type.h"

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

template <template <typename> class Function, typename Name,
          template <PrimitiveType, typename, bool> class Data, bool is_stddev>
AggregateFunctionPtr create_function_single_value(const String& name,
                                                  const DataTypes& argument_types,
                                                  const DataTypePtr& result_type,
                                                  const bool result_is_nullable,
                                                  const AggregateFunctionAttr& attr) {
    return creator_without_type::create<Function<Data<TYPE_DOUBLE, Name, is_stddev>>>(
            argument_types, result_is_nullable, attr);
}

AggregateFunctionPtr create_aggregate_function_variance_samp(const std::string& name,
                                                             const DataTypes& argument_types,
                                                             const DataTypePtr& result_type,
                                                             const bool result_is_nullable,
                                                             const AggregateFunctionAttr& attr) {
    return create_function_single_value<AggregateFunctionSampVariance, VarianceSampName, SampData,
                                        false>(name, argument_types, result_type,
                                               result_is_nullable, attr);
}

AggregateFunctionPtr create_aggregate_function_variance_pop(const std::string& name,
                                                            const DataTypes& argument_types,
                                                            const DataTypePtr& result_type,
                                                            const bool result_is_nullable,
                                                            const AggregateFunctionAttr& attr) {
    return create_function_single_value<AggregateFunctionSampVariance, VarianceName, PopData,
                                        false>(name, argument_types, result_type,
                                               result_is_nullable, attr);
}

AggregateFunctionPtr create_aggregate_function_stddev_pop(const std::string& name,
                                                          const DataTypes& argument_types,
                                                          const DataTypePtr& result_type,
                                                          const bool result_is_nullable,
                                                          const AggregateFunctionAttr& attr) {
    return create_function_single_value<AggregateFunctionSampVariance, StddevName, PopData, true>(
            name, argument_types, result_type, result_is_nullable, attr);
}

AggregateFunctionPtr create_aggregate_function_stddev_samp(const std::string& name,
                                                           const DataTypes& argument_types,
                                                           const DataTypePtr& result_type,
                                                           const bool result_is_nullable,
                                                           const AggregateFunctionAttr& attr) {
    return create_function_single_value<AggregateFunctionSampVariance, StddevSampName, SampData,
                                        true>(name, argument_types, result_type, result_is_nullable,
                                              attr);
}

void register_aggregate_function_stddev_variance_pop(AggregateFunctionSimpleFactory& factory) {
    factory.register_function_both("variance", create_aggregate_function_variance_pop);
    factory.register_alias("variance", "var_pop");
    factory.register_alias("variance", "variance_pop");
    factory.register_function_both("stddev", create_aggregate_function_stddev_pop);
    factory.register_alias("stddev", "stddev_pop");
    factory.register_alias("stddev", "std");
}

void register_aggregate_function_stddev_variance_samp_old(AggregateFunctionSimpleFactory& factory) {
    BeExecVersionManager::registe_restrict_function_compatibility("variance_samp");
    BeExecVersionManager::registe_restrict_function_compatibility("stddev_samp");
}

void register_aggregate_function_stddev_variance_samp(AggregateFunctionSimpleFactory& factory) {
    factory.register_function_both("variance_samp", create_aggregate_function_variance_samp);
    factory.register_alias("variance_samp", "var_samp");
    factory.register_function_both("stddev_samp", create_aggregate_function_stddev_samp);
    register_aggregate_function_stddev_variance_samp_old(factory);
}
} // namespace doris::vectorized