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#include <Functions/IFunction.h>
#include <Functions/FunctionFactory.h>
#include <DataTypes/DataTypeLowCardinality.h>
#include <DataTypes/DataTypeString.h>
#include <Columns/ColumnString.h>
#include <Common/ErrorCodes.h>
namespace DB
{
namespace ErrorCodes
{
extern const int BAD_ARGUMENTS;
}
/** errorCodeToName() - returns the variable name for the error code.
*/
class FunctionErrorCodeToName : public IFunction
{
public:
static constexpr auto name = "errorCodeToName";
static FunctionPtr create(ContextPtr)
{
return std::make_shared<FunctionErrorCodeToName>();
}
String getName() const override { return name; }
size_t getNumberOfArguments() const override { return 1; }
bool useDefaultImplementationForConstants() const override { return true; }
bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return false; }
DataTypePtr getReturnTypeImpl(const DataTypes & types) const override
{
if (!isNumber(types.at(0)))
throw Exception(ErrorCodes::BAD_ARGUMENTS, "The argument of function {} must have simple numeric type, possibly Nullable", name);
return std::make_shared<DataTypeLowCardinality>(std::make_shared<DataTypeString>());
}
ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr & res_type, size_t input_rows_count) const override
{
const auto & input_column = *arguments[0].column;
auto col_res = res_type->createColumn();
for (size_t i = 0; i < input_rows_count; ++i)
{
const Int64 error_code = input_column.getInt(i);
std::string_view error_name =
ErrorCodes::getName(static_cast<ErrorCodes::ErrorCode>(error_code));
col_res->insertData(error_name.data(), error_name.size());
}
return col_res;
}
};
REGISTER_FUNCTION(ErrorCodeToName)
{
factory.registerFunction<FunctionErrorCodeToName>();
}
}
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