getSupportedFunctions());
// add AbsFunction
generalFunctions.addAll((new AbsFunctionCluster()).
getSupportedFunctions());
// add RoundFunction
generalFunctions.addAll((new RoundFunctionCluster()).
getSupportedFunctions());
// add FloorFunction
generalFunctions.addAll((new FloorFunctionCluster()).
getSupportedFunctions());
// add DateMathFunction