text: #include <Functions/IFunction.h>
  #include <Functions/FunctionFactory.h>
  #include <Functions/FunctionHelpers.h>
  #include <Columns/ColumnString.h>
  #include <Columns/ColumnsNumber.h>
  #include <Columns/ColumnsCommon.h>
  #include <DataTypes/DataTypesNumber.h>
  #include <IO/WriteHelpers.h>
  
  
  namespace DB
  {
  namespace ErrorCodes
  {
      extern const int ILLEGAL_COLUMN;
      extern const int ILLEGAL_TYPE_OF_ARGUMENT;
      extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
      extern const int FUNCTION_THROW_IF_VALUE_IS_NON_ZERO;
  }
  
  namespace
  {
  
  /// Throw an exception if the argument is non zero.
  class FunctionThrowIf : public IFunction
  {
  public:
      static constexpr auto name = "throwIf";
      static FunctionPtr create(ContextPtr)
      {
          return std::make_shared<FunctionThrowIf>();
      }
  
      String getName() const override
      {
          return name;
      }
  
      bool isVariadic() const override { return true; }
      bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & /*arguments*/) const override { return true; }
      size_t getNumberOfArguments() const override
      {
          return 0;
      }
  
      DataTypePtr getReturnTypeImpl(const DataTypes & arguments) const override
      {
          const size_t number_of_arguments = arguments.size();
  
          if (number_of_arguments < 1 || number_of_arguments > 2)
              throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
                  "Number of arguments for function {} doesn't match: passed {}, should be 1 or 2",
                  getName(),
                  toString(number_of_arguments));
  
          if (!isNativeNumber(arguments[0]))
              throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
                  "Argument for function {} must be number",
                  getName());
  
          if (number_of_arguments > 1 && !isString(arguments[1]))
              throw Exception(ErrorCodes::ILLEGAL_TYPE_OF_ARGUMENT,
                  "Illegal type {} of argument of function {}",
                  arguments[1]->getName(),
                  getName());
  
  
          return std::make_shared<DataTypeUInt8>();
      }
  
      bool useDefaultImplementationForConstants() const override { return false; }
      ColumnNumbers getArgumentsThatAreAlwaysConstant() const override { return {1}; }
  
      /** Prevent constant folding for FunctionThrowIf because for short circuit evaluation
        * it is unsafe to evaluate this function during DAG analysis.
        */
      bool isSuitableForConstantFolding() const override { return false; }
  
      ColumnPtr executeImpl(const ColumnsWithTypeAndName & arguments, const DataTypePtr & result_type, size_t input_rows_count) const override
      {
          if (input_rows_count == 0)
              return result_type->createColumn();
  
          std::optional<String> custom_message;
          if (arguments.size() == 2)
          {
              const auto * message_column = checkAndGetColumnConst<ColumnString>(arguments[1].column.get());
              if (!message_column)
                  throw Exception(ErrorCodes::ILLEGAL_COLUMN,
                      "Second argument for function {} must be constant String",
                      getName());
  
              custom_message = message_column->getValue<String>();
          }
  
          auto first_argument_column = arguments.front().column;
          const auto * in = first_argument_column.get();
  
          ColumnPtr res;
          if (!((res = execute<UInt8>(in, custom_message))
              || (res = execute<UInt16>(in, custom_message))
              || (res = execute<UInt32>(in, custom_message))
              || (res = execute<UInt64>(in, custom_message))
              || (res = execute<Int8>(in, custom_message))
              || (res = execute<Int16>(in, custom_message))
              || (res = execute<Int32>(in, custom_message))
              || (res = execute<Int64>(in, custom_message))
              || (res = execute<Float32>(in, custom_message))
              || (res = execute<Float64>(in, custom_message))))
          {
              throw Exception{"Illegal column " + in->getName() + " of first argument of function " + getName(), ErrorCodes::ILLEGAL_COLUMN};
          }
  
          return res;
      }
  
      template <typename T>
      ColumnPtr execute(const IColumn * in_untyped, const std::optional<String> & message) const
      {
          const auto * in = checkAndGetColumn<ColumnVector<T>>(in_untyped);
  
          if (!in)
              in = checkAndGetColumnConstData<ColumnVector<T>>(in_untyped);
  
          if (in)
          {
              const auto & in_data = in->getData();
              if (!memoryIsZero(in_data.data(), in_data.size() * sizeof(in_data[0])))
              {
                  throw Exception(ErrorCodes::FUNCTION_THROW_IF_VALUE_IS_NON_ZERO,
                      message.value_or("Value passed to '" + getName() + "' function is non zero"));
              }
  
              size_t result_size = in_untyped->size();
  
              /// We return non constant to avoid constant folding.
              return ColumnUInt8::create(result_size, 0);
          }
  
          return nullptr;
      }
  };
  
  }
  
  void registerFunctionThrowIf(FunctionFactory & factory)
  {
      factory.registerFunction<FunctionThrowIf>();
  }
  
  }
  