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