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#pragma once
#include <Functions/IFunctionCustomWeek.h>
namespace DB
{
namespace ErrorCodes
{
extern const int ILLEGAL_TYPE_OF_ARGUMENT;
}
/// See CustomWeekTransforms.h
template <typename ToDataType, typename Transform>
class FunctionCustomWeekToSomething : public IFunctionCustomWeek<Transform>
{
public:
static FunctionPtr create(ContextPtr) { return std::make_shared<FunctionCustomWeekToSomething>(); }
DataTypePtr getReturnTypeImpl(const ColumnsWithTypeAndName & arguments) const override
{
this->checkArguments(arguments);
return std::make_shared<ToDataType>();
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr & result_type, size_t input_rows_count) const override
{
const IDataType * from_type = arguments[0].type.get();
WhichDataType which(from_type);
if (which.isDate())
return CustomWeekTransformImpl<DataTypeDate, ToDataType>::execute(
arguments, result_type, input_rows_count, Transform{});
else if (which.isDate32())
return CustomWeekTransformImpl<DataTypeDate32, ToDataType>::execute(
arguments, result_type, input_rows_count, Transform{});
else if (which.isDateTime())
return CustomWeekTransformImpl<DataTypeDateTime, ToDataType>::execute(
arguments, result_type, input_rows_count, Transform{});
else if (which.isDateTime64())
{
return CustomWeekTransformImpl<DataTypeDateTime64, ToDataType>::execute(
arguments, result_type, input_rows_count,
TransformDateTime64<Transform>{assert_cast<const DataTypeDateTime64 *>(from_type)->getScale()});
}
else
throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
"Illegal type {} of argument of function {}",
arguments[0].type->getName(), this->getName());
}
};
}
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