code: public static PredicateDef cmp(CompareOperation eq, Expression left, Expression right) {
  		return new PredicateDefCmp(eq, left, right);
  	}
docs: Compares arguments
  
  @param eq    operation which will be used for the arguments
  @param left  first argument which will be compared
  @param right second argument which will be compared
  @return new instance of the PredicateDefCmp