contrib/piggybank/java/src/main/java/org/apache/pig/piggybank/evaluation/stats/COV.java [103:163]:
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                    if(flag){
                        temp.set(0, schemaName.elementAt(i));
                        temp.set(1, schemaName.elementAt(j));
                    }
                    else{
                        temp.set(0, "var"+i);
                        temp.set(1, "var"+j);
                    }
                
                    Tuple tempResult = computeAll((DataBag)input.get(i), (DataBag)input.get(j));
                    double size = ((DataBag)input.get(i)).size();
                    double sum_x_y = (Double)tempResult.get(0);
                    double sum_x = (Double)tempResult.get(1);
                    double sum_y = (Double)tempResult.get(2);
                    double result = (size*sum_x_y - sum_x*sum_y)/(size*size);
                    temp.set(2, result);
                    output.add(temp);
                }
            }
        }catch(Exception e){
            System.err.println("Failed to process input; error - " + e.getMessage());
            return null;
        }

        return output;
    }
    

    //used to pass schema name to Final class constructor 
    /**
     * Function to return argument of constructor as string. It append ( and ) at starting and end or argument respectively.
     * If default constructor is called is returns empty string.
     * @return argument of constructor
     */
    @Override
    public String toString() {
        if(flag){
            StringBuilder sb = new StringBuilder();
            sb.append('(');
            if(schemaName!=null){
                for (String sch : schemaName) {
                    sb.append('\'' + sch + '\'' + ",");
                }
                sb.deleteCharAt(sb.length()-1);
            }
            sb.append(')');
            return sb.toString();
        }
        else return "";
    }
    public String getInitial() {
        return Initial.class.getName();
    }

    public String getIntermed() {
        return Intermed.class.getName();
    }

    public String getFinal() {
        //return Final.class.getName();
        return Final.class.getName() + toString();
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src/org/apache/pig/builtin/COV.java [77:137]:
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                    if(flag){
                        temp.set(0, schemaName.elementAt(i));
                        temp.set(1, schemaName.elementAt(j));
                    }
                    else{
                        temp.set(0, "var"+i);
                        temp.set(1, "var"+j);
                    }
                
                    Tuple tempResult = computeAll((DataBag)input.get(i), (DataBag)input.get(j));
                    double size = ((DataBag)input.get(i)).size();
                    double sum_x_y = (Double)tempResult.get(0);
                    double sum_x = (Double)tempResult.get(1);
                    double sum_y = (Double)tempResult.get(2);
                    double result = (size*sum_x_y - sum_x*sum_y)/(size*size);
                    temp.set(2, result);
                    output.add(temp);
                }
            }
        }catch(Exception e){
            System.err.println("Failed to process input; error - " + e.getMessage());
            return null;
        }

        return output;
    }
    

    //used to pass schema name to Final class constructor 
    /**
     * Function to return argument of constructor as string. It append ( and ) at starting and end or argument respectively.
     * If default constructor is called is returns empty string.
     * @return argument of constructor
     */
    @Override
    public String toString() {
        if(flag){
            StringBuilder sb = new StringBuilder();
            sb.append('(');
            if(schemaName!=null){
                for (String sch : schemaName) {
                    sb.append('\'' + sch + '\'' + ",");
                }
                sb.deleteCharAt(sb.length()-1);
            }
            sb.append(')');
            return sb.toString();
        }
        else return "";
    }
    public String getInitial() {
        return Initial.class.getName();
    }

    public String getIntermed() {
        return Intermed.class.getName();
    }

    public String getFinal() {
        //return Final.class.getName();
        return Final.class.getName() + toString();
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