#include #include #include #include #include #include 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(const Context &) { return std::make_shared(); } String getName() const override { return name; } size_t getNumberOfArguments() const override { return 1; } bool useDefaultImplementationForConstants() const override { return true; } 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(std::make_shared()); } ColumnPtr executeImpl(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(error_code); col_res->insertData(error_name.data(), error_name.size()); } return col_res; } }; void registerFunctionErrorCodeToName(FunctionFactory & factory) { factory.registerFunction(); } }