102 lines
3.8 KiB
C++
102 lines
3.8 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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// This file is copied from
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// https://github.com/ClickHouse/ClickHouse/blob/master/src/Functions/FunctionConst.h
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// and modified by Doris
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#pragma once
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#include "vec/columns/column_const.h"
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#include "vec/columns/columns_number.h"
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#include "vec/data_types/data_type_number.h"
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#include "vec/functions/function.h"
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namespace doris::vectorized {
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template <typename Impl, bool use_field = true>
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class FunctionConst : public IFunction {
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public:
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static constexpr auto name = Impl::name;
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static FunctionPtr create() { return std::make_shared<FunctionConst>(); }
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public:
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String get_name() const override { return name; }
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size_t get_number_of_arguments() const override { return 0; }
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DataTypePtr get_return_type_impl(const DataTypes& /*arguments*/) const override {
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return Impl::get_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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block.get_by_position(result).column =
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block.get_by_position(result).type->create_column_const(input_rows_count,
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Impl::init_value());
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return Status::OK();
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}
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};
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template <typename Impl>
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class FunctionConst<Impl, false> : public IFunction {
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public:
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static constexpr auto name = Impl::name;
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static FunctionPtr create() { return std::make_shared<FunctionConst>(); }
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String get_name() const override { return name; }
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size_t get_number_of_arguments() const override { return 0; }
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DataTypePtr get_return_type_impl(const DataTypes& /*arguments*/) const override {
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return Impl::get_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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auto column = Impl::ReturnColVec::create();
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column->get_data().emplace_back(Impl::init_value());
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block.replace_by_position(result, ColumnConst::create(std::move(column), input_rows_count));
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return Status::OK();
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}
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};
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template <typename Impl>
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class FunctionMathConstFloat64 : public IFunction {
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public:
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static constexpr auto name = Impl::name;
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static FunctionPtr create() { return std::make_shared<FunctionMathConstFloat64>(); }
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private:
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String get_name() const override { return name; }
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size_t get_number_of_arguments() const override { return 0; }
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DataTypePtr get_return_type_impl(const DataTypes& /*arguments*/) const override {
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return std::make_shared<DataTypeFloat64>();
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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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block.get_by_position(result).column =
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block.get_by_position(result).type->create_column_const(
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input_rows_count == 0 ? 1 : input_rows_count, Impl::value);
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return Status::OK();
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}
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};
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} // namespace doris::vectorized
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