ClickHouse/dbms/src/Functions/FunctionMathConstFloat64.h
alexey-milovidov f6c264b70b
Every function in its own file, part 9 (#3733)
* Every function in its own file, part 9 [#CLICKHOUSE-2]

* Every function in its own file, part 9 [#CLICKHOUSE-2]
2018-12-03 06:17:06 +03:00

35 lines
903 B
C++

#pragma once
#include <DataTypes/DataTypesNumber.h>
#include <Columns/ColumnsNumber.h>
#include <Functions/IFunction.h>
namespace DB
{
template <typename Impl>
class FunctionMathConstFloat64 : public IFunction
{
public:
static constexpr auto name = Impl::name;
static FunctionPtr create(const Context &) { return std::make_shared<FunctionMathConstFloat64>(); }
private:
String getName() const override { return name; }
size_t getNumberOfArguments() const override { return 0; }
DataTypePtr getReturnTypeImpl(const DataTypes & /*arguments*/) const override
{
return std::make_shared<DataTypeFloat64>();
}
void executeImpl(Block & block, const ColumnNumbers &, size_t result, size_t input_rows_count) override
{
block.getByPosition(result).column = block.getByPosition(result).type->createColumnConst(input_rows_count, Impl::value);
}
};
}