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100 lines (81 loc) · 3.78 KB
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// 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/Functions/FunctionConst.h
// and modified by Doris
#pragma once
#include "core/column/column_const.h"
#include "core/data_type/data_type_number.h"
#include "exprs/function/function.h"
namespace doris {
template <typename Impl, bool use_field = true>
class FunctionConst : public IFunction {
public:
static constexpr auto name = Impl::name;
static FunctionPtr create() { return std::make_shared<FunctionConst>(); }
public:
String get_name() const override { return name; }
size_t get_number_of_arguments() const override { return 0; }
DataTypePtr get_return_type_impl(const DataTypes& /*arguments*/) const override {
return Impl::get_return_type();
}
Status execute_impl(FunctionContext* context, Block& block, const ColumnNumbers& arguments,
uint32_t result, size_t input_rows_count) const override {
block.get_by_position(result).column =
block.get_by_position(result).type->create_column_const(input_rows_count,
Impl::init_value());
return Status::OK();
}
};
template <typename Impl>
class FunctionConst<Impl, false> : public IFunction {
public:
static constexpr auto name = Impl::name;
static FunctionPtr create() { return std::make_shared<FunctionConst>(); }
String get_name() const override { return name; }
size_t get_number_of_arguments() const override { return 0; }
DataTypePtr get_return_type_impl(const DataTypes& /*arguments*/) const override {
return Impl::get_return_type();
}
Status execute_impl(FunctionContext* context, Block& block, const ColumnNumbers& arguments,
uint32_t result, size_t input_rows_count) const override {
auto column = Impl::ReturnColVec::create();
column->get_data().emplace_back(Impl::init_value());
block.replace_by_position(result, ColumnConst::create(std::move(column), input_rows_count));
return Status::OK();
}
};
template <typename Impl>
class FunctionMathConstFloat64 : public IFunction {
public:
static constexpr auto name = Impl::name;
static FunctionPtr create() { return std::make_shared<FunctionMathConstFloat64>(); }
private:
String get_name() const override { return name; }
size_t get_number_of_arguments() const override { return 0; }
DataTypePtr get_return_type_impl(const DataTypes& /*arguments*/) const override {
return std::make_shared<DataTypeFloat64>();
}
Status execute_impl(FunctionContext* context, Block& block, const ColumnNumbers& arguments,
uint32_t result, size_t input_rows_count) const override {
block.get_by_position(result).column =
block.get_by_position(result).type->create_column_const(
input_rows_count, Field::create_field<TYPE_DOUBLE>(Impl::value));
return Status::OK();
}
};
} // namespace doris