czzmmc commented on code in PR #22020: URL: https://github.com/apache/doris/pull/22020#discussion_r1268974159
########## be/src/vec/aggregate_functions/aggregate_function_count_by_enum.h: ########## @@ -0,0 +1,202 @@ +// 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.h +// and modified by Doris + +#pragma once + +#include <array> + +#include "common/logging.h" +#include "vec/aggregate_functions/aggregate_function.h" +#include "vec/columns/column_nullable.h" +#include "vec/common/assert_cast.h" +#include "vec/data_types/data_type_number.h" +#include "vec/io/io_helper.h" +#include "vec/utils/count_by_enum_helpers.hpp" + +namespace doris::vectorized { + +struct AggregateFunctionCountByEnumData { + using MapType = std::unordered_map<std::string, uint64_t>; + + void reset() { data_vec.clear(); } + + void add(int idx, const StringRef& value, const UInt64& number = 1) { + if (data_vec.size() <= idx) { + data_vec.emplace_back(); + } + + std::string key = value.to_string(); + CountByEnumData& data = data_vec[idx]; + MapType& unordered_map = data.cbe; + auto it = unordered_map.find(key); + if (it != unordered_map.end()) { + it->second += number; + } else { + unordered_map.emplace(key, number); + } + data.not_null += number; + data.all += number; + } + + void add(int idx, const UInt64& number = 1) { + if (data_vec.size() <= idx) { + data_vec.emplace_back(); + } + + data_vec[idx].null += number; + data_vec[idx].all += number; + } + + void merge(const AggregateFunctionCountByEnumData& rhs) { + for (int idx = 0; idx < rhs.data_vec.size(); idx++) { + CountByEnumData& data = data_vec.size() <= idx ? data_vec.emplace_back() : data_vec[idx]; + const CountByEnumData& rhs_data = rhs.data_vec[idx]; + const MapType& rhs_unordered_map = rhs_data.cbe; + MapType& lhs_unordered_map = data.cbe; + + for (auto rhs_it : rhs_unordered_map) { + auto lhs_it = lhs_unordered_map.find(rhs_it.first); + if (lhs_it != lhs_unordered_map.end()) { + lhs_it->second += rhs_it.second; + } else { + lhs_unordered_map.emplace(rhs_it.first, rhs_it.second); + } + } + + data.not_null += rhs_data.not_null; + data.null += rhs_data.null; + data.all += rhs_data.all; + } + } + + void write(BufferWritable& buf) const { + write_binary(data_vec.size(), buf); + + for (const auto& data : data_vec) { + const MapType& unordered_map = data.cbe; + write_binary(unordered_map.size(), buf); + + for (const auto& [key, value] : unordered_map) { + write_binary(value, buf); + write_binary(key, buf); + } + + write_binary(data.not_null, buf); + write_binary(data.null, buf); + write_binary(data.all, buf); + } + } + + void read(BufferReadable& buf) { + data_vec.clear(); + + uint64_t vec_size_number = 0; + read_binary(vec_size_number, buf); + + for (int idx = 0; idx < vec_size_number; idx++) { + uint64_t element_number = 0; + read_binary(element_number, buf); + + MapType unordered_map; + unordered_map.reserve(element_number); + for (auto i = 0; i < element_number; i++) { + std::string key; + uint64_t value; + read_binary(value, buf); + read_binary(key, buf); + unordered_map.emplace(std::move(key), value); + } + + CountByEnumData data; + data.cbe = std::move(unordered_map); + read_binary(data.not_null, buf); + read_binary(data.null, buf); + read_binary(data.all, buf); + data_vec.emplace_back(std::move(data)); + } + } + + std::string get() const { + rapidjson::StringBuffer buffer; + build_json_from_vec(buffer, data_vec); + return std::string(buffer.GetString()); + } + +private: + std::vector<CountByEnumData> data_vec; +}; + +template <typename Data> +class AggregateFunctionCountByEnum final + : public IAggregateFunctionDataHelper<Data, AggregateFunctionCountByEnum<Data>> { +public: + AggregateFunctionCountByEnum() = default; + AggregateFunctionCountByEnum(const DataTypes& argument_types_) + : IAggregateFunctionDataHelper< + Data, + AggregateFunctionCountByEnum<Data>>(argument_types_, {}), _argument_type(argument_types_[0]) { + arg_count = argument_types_.size(); + } + + std::string get_name() const override { return "count_by_enum"; } + + DataTypePtr get_return_type() const override { return std::make_shared<DataTypeString>(); } + + void add(AggregateDataPtr __restrict place, const IColumn** columns, size_t row_num, + Arena* arena) const override { + + for (int i = 0; i < arg_count; i++) { + const auto* nullable_column = check_and_get_column<ColumnNullable>(columns[i]); Review Comment: We wanna count all rows including not null rows and null rows. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
