ClickHouse/dbms/src/Functions/timezone.cpp
2018-09-09 01:04:39 +03:00

51 lines
1.1 KiB
C++

#include <Functions/IFunction.h>
#include <Functions/FunctionFactory.h>
#include <common/DateLUT.h>
#include <DataTypes/DataTypeString.h>
namespace DB
{
/** Returns the server time zone.
*/
class FunctionTimeZone : public IFunction
{
public:
static constexpr auto name = "timezone";
static FunctionPtr create(const Context &)
{
return std::make_shared<FunctionTimeZone>();
}
String getName() const override
{
return name;
}
size_t getNumberOfArguments() const override
{
return 0;
}
DataTypePtr getReturnTypeImpl(const DataTypes & /*arguments*/) const override
{
return std::make_shared<DataTypeString>();
}
bool isDeterministic() const override { return false; }
void executeImpl(Block & block, const ColumnNumbers &, size_t result, size_t input_rows_count) override
{
block.getByPosition(result).column = DataTypeString().createColumnConst(input_rows_count, DateLUT::instance().getTimeZone());
}
};
void registerFunctionTimeZone(FunctionFactory & factory)
{
factory.registerFunction<FunctionTimeZone>();
}
}