datafu-pig/src/main/java/datafu/pig/stats/DoubleVAR.java [262:291]:
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                if (d == null) continue;
                sawNonNull = true;
                sum += d;
            }catch(RuntimeException exp) {
                int errCode = 2103;
                String msg = "Problem while computing sum of values.";
                throw new ExecException(msg, errCode, PigException.BUG, exp);
            }
        }

        if(sawNonNull) {
            return new Double(sum);
        } else {
            return null;
        }
    }
    
    static protected Double sumSquare(Tuple input) throws ExecException, IOException {
        DataBag values = (DataBag)input.get(0);
        
        // if we were handed an empty bag, return NULL
        if(values.size() == 0) {
            return null;
        }

        double sumSquare = 0;
        boolean sawNonNull = false;
        for (Iterator<Tuple> it = values.iterator(); it.hasNext();) {
            Tuple t = it.next();
            try{
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datafu-pig/src/main/java/datafu/pig/stats/VAR.java [279:308]:
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                if (d == null) continue;
                sawNonNull = true;
                sum += d;
            }catch(RuntimeException exp) {
                int errCode = 2103;
                String msg = "Problem while computing sum of values.";
                throw new ExecException(msg, errCode, PigException.BUG, exp);
            }
        }

        if(sawNonNull) {
            return new Double(sum);
        } else {
            return null;
        }
    }
    
    static protected Double sumSquare(Tuple input) throws ExecException, IOException {
        DataBag values = (DataBag)input.get(0);
        
        // if we were handed an empty bag, return NULL
        if(values.size() == 0) {
            return null;
        }

        double sumSquare = 0;
        boolean sawNonNull = false;
        for (Iterator<Tuple> it = values.iterator(); it.hasNext();) {
            Tuple t = it.next();
            try{
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