// add FloorFunction
generalFunctions.addAll((new FloorFunctionCluster()).getSupportedFunctions());
// add DateMathFunction
generalFunctions.addAll((new DateMathFunctionCluster()).getSupportedFunctions());
// add general functions from BagFunction
generalFunctions.addAll((new GeneralBagFunctionCluster()).getSupportedFunctions());
// add NumericConvertFunction
generalFunctions.addAll((new NumericConvertFunctionCluster()).getSupportedFunctions());
// add StringNormalizeFunction
generalFunctions.addAll((new StringNormalizeFunctionCluster()).getSupportedFunctions());
// add general functions from SetFunction