putFunction(new SubstractFunction(), reservedFunctions);
putFunction(new PowerFunction(), reservedFunctions);
putFunction(new PowerCharFunction(), reservedFunctions);
putFunction(new DateAddFunction(), reservedFunctions);
putFunction(new DateDiffFunction(), reservedFunctions);
putFunction(new LengthFunction(), reservedFunctions);
putFunction(new SubStringFunction(), reservedFunctions);
putFunction(new ToLowerFunction(), reservedFunctions);
putFunction(new ToUpperFunction(), reservedFunctions);