115 lines
6.0 KiB
C++
115 lines
6.0 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#include "vec/aggregate_functions/aggregate_function_stddev.h"
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#include "common/logging.h"
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#include "vec/aggregate_functions/aggregate_function_simple_factory.h"
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#include "vec/aggregate_functions/factory_helpers.h"
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#include "vec/aggregate_functions/helpers.h"
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namespace doris::vectorized {
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template <template <typename, bool> class AggregateFunctionTemplate,
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template <typename> class NameData, template <typename, typename> class Data,
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bool is_stddev, bool is_nullable = false>
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static IAggregateFunction* create_function_single_value(const String& name,
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const DataTypes& argument_types,
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const Array& parameters) {
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auto type = argument_types[0].get();
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if (type->is_nullable()) {
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type = assert_cast<const DataTypeNullable*>(type)->get_nested_type().get();
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}
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WhichDataType which(*type);
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#define DISPATCH(TYPE) \
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if (which.idx == TypeIndex::TYPE) \
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return new AggregateFunctionTemplate<NameData<Data<TYPE, BaseData<TYPE, is_stddev>>>, \
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is_nullable>(argument_types);
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FOR_NUMERIC_TYPES(DISPATCH)
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#undef DISPATCH
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if (which.is_decimal()) {
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return new AggregateFunctionTemplate<NameData<Data<Decimal128, BaseDatadecimal<is_stddev>>>,
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is_nullable>(argument_types);
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}
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DCHECK(false) << "with unknowed type, failed in create_aggregate_function_stddev_variance";
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return nullptr;
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}
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template <bool is_stddev, bool is_nullable>
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AggregateFunctionPtr create_aggregate_function_variance_samp(const std::string& name,
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const DataTypes& argument_types,
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const Array& parameters,
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const bool result_is_nullable) {
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return AggregateFunctionPtr(
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create_function_single_value<AggregateFunctionSamp, VarianceSampName, SampData,
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is_stddev, is_nullable>(name, argument_types, parameters));
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}
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template <bool is_stddev, bool is_nullable>
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AggregateFunctionPtr create_aggregate_function_stddev_samp(const std::string& name,
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const DataTypes& argument_types,
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const Array& parameters,
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const bool result_is_nullable) {
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return AggregateFunctionPtr(
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create_function_single_value<AggregateFunctionSamp, StddevSampName, SampData, is_stddev,
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is_nullable>(name, argument_types, parameters));
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}
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template <bool is_stddev>
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AggregateFunctionPtr create_aggregate_function_variance_pop(const std::string& name,
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const DataTypes& argument_types,
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const Array& parameters,
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const bool result_is_nullable) {
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return AggregateFunctionPtr(
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create_function_single_value<AggregateFunctionPop, VarianceName, PopData, is_stddev>(
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name, argument_types, parameters));
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}
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template <bool is_stddev>
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AggregateFunctionPtr create_aggregate_function_stddev_pop(const std::string& name,
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const DataTypes& argument_types,
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const Array& parameters,
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const bool result_is_nullable) {
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return AggregateFunctionPtr(
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create_function_single_value<AggregateFunctionPop, StddevName, PopData, is_stddev>(
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name, argument_types, parameters));
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}
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void register_aggregate_function_stddev_variance_pop(AggregateFunctionSimpleFactory& factory) {
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factory.register_function("variance", create_aggregate_function_variance_pop<false>);
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factory.register_alias("variance", "var_pop");
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factory.register_alias("variance", "variance_pop");
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factory.register_function("stddev", create_aggregate_function_stddev_pop<true>);
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factory.register_alias("stddev", "stddev_pop");
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}
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void register_aggregate_function_stddev_variance_samp(AggregateFunctionSimpleFactory& factory) {
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// _samp<bool, bool>: first indicate is stddev or variance function
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// second indicate is arg nullable column
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factory.register_function("variance_samp",
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create_aggregate_function_variance_samp<false, false>, false);
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factory.register_function("variance_samp", create_aggregate_function_variance_samp<false, true>,
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true);
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factory.register_alias("variance_samp", "var_samp");
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factory.register_function("stddev_samp", create_aggregate_function_stddev_samp<true, false>,
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false);
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factory.register_function("stddev_samp", create_aggregate_function_stddev_samp<true, true>,
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true);
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}
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} // namespace doris::vectorized
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