146 lines
6.1 KiB
C++
146 lines
6.1 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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#pragma once
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#include <stddef.h>
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#include <algorithm>
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#include <boost/iterator/iterator_facade.hpp>
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#include <memory>
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#include <string>
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#include <utility>
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#include "common/status.h"
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#include "vec/aggregate_functions/aggregate_function.h"
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#include "vec/columns/column.h"
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#include "vec/common/string_ref.h"
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#include "vec/core/block.h"
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#include "vec/core/column_numbers.h"
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#include "vec/core/column_with_type_and_name.h"
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#include "vec/core/columns_with_type_and_name.h"
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#include "vec/core/types.h"
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#include "vec/data_types/data_type.h"
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#include "vec/data_types/data_type_nullable.h"
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#include "vec/data_types/data_type_number.h"
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#include "vec/data_types/data_type_time.h"
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#include "vec/data_types/number_traits.h"
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#include "vec/functions/function.h"
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#include "vec/functions/simple_function_factory.h"
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namespace doris {
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class FunctionContext;
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} // namespace doris
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namespace doris::vectorized {
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class FunctionRunningDifference : public IFunction {
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public:
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static constexpr auto name = "running_difference";
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static FunctionPtr create() { return std::make_shared<FunctionRunningDifference>(); }
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String get_name() const override { return name; }
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size_t get_number_of_arguments() const override { return 1; }
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bool use_default_implementation_for_nulls() const override { return false; }
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template <typename SrcFieldType>
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using DstFieldType =
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typename NumberTraits::ResultOfSubtraction<SrcFieldType, SrcFieldType>::Type;
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DataTypePtr get_return_type_impl(const DataTypes& arguments) const override {
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bool is_nullable = arguments[0]->is_nullable();
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auto nested_type = remove_nullable(arguments[0]);
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WhichDataType which(nested_type);
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//return type is promoted to prevent result overflow
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//like: input is int32 ---> return type will be int64
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DataTypePtr return_type = nullptr;
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if (which.is_uint8() || which.is_int8()) {
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return_type = std::make_shared<DataTypeInt16>();
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} else if (which.is_uint16() || which.is_int16()) {
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return_type = std::make_shared<DataTypeInt32>();
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} else if (which.is_uint32() || which.is_uint64() || which.is_int32() || which.is_int64()) {
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return_type = std::make_shared<DataTypeInt64>();
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} else if (which.is_int128()) {
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return_type = std::make_shared<DataTypeInt128>();
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} else if (which.is_float32() || which.is_float64()) {
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return_type = std::make_shared<DataTypeFloat64>();
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} else if (which.is_decimal()) {
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return_type = nested_type;
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} else if (which.is_date_time() || which.is_date_time_v2()) {
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return_type = std::make_shared<DataTypeTime>();
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} else if (which.is_date() || which.is_date_v2()) {
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return_type = std::make_shared<DataTypeInt32>();
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}
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return_type = is_nullable ? make_nullable(return_type) : return_type;
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const ColumnsWithTypeAndName subtract_cols {{nullptr, arguments[0], "first_arg"},
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{nullptr, arguments[0], "second_arg"}};
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if (which.is_date_time() || which.is_date_time_v2()) {
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func_subtract = SimpleFunctionFactory::instance().get_function(
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"timediff", subtract_cols, return_type);
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} else if (which.is_date() || which.is_date_v2()) {
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func_subtract = SimpleFunctionFactory::instance().get_function(
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"datediff", subtract_cols, return_type);
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} else {
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func_subtract = SimpleFunctionFactory::instance().get_function(
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"subtract", subtract_cols, return_type);
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}
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func_return_type = return_type;
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return return_type;
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}
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Status execute_impl(FunctionContext* context, Block& block, const ColumnNumbers& arguments,
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size_t result, size_t input_rows_count) override {
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if (is_column_const(*block.get_by_position(arguments[0]).column)) {
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auto res = func_return_type->create_column_const_with_default_value(input_rows_count);
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block.replace_by_position(result, std::move(res));
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return Status::OK();
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}
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auto arg_first = block.get_by_position(arguments[0]).column;
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auto arg_type = block.get_by_position(arguments[0]).type;
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auto arg_second = arg_type->create_column();
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if (is_first_block) {
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arg_second->insert_from(*arg_first, 0);
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is_first_block = false;
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} else {
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arg_second->insert_data(last_value.c_str(), last_value.length());
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}
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arg_second->insert_range_from(*arg_first, 0, input_rows_count - 1);
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last_value = arg_first->get_data_at(input_rows_count - 1).to_string();
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Block temporary_block {
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ColumnsWithTypeAndName {block.get_by_position(arguments[0]),
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{std::move(arg_second), arg_type, "second_arg"},
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block.get_by_position(result)}};
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func_subtract->execute(context, temporary_block, {0, 1}, 2, input_rows_count);
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block.get_by_position(result).column = temporary_block.get_by_position(2).column;
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return Status::OK();
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}
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private:
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mutable FunctionBasePtr func_subtract;
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mutable DataTypePtr func_return_type;
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bool is_first_block = true;
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std::string last_value;
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};
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} // namespace doris::vectorized
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