Method getMemorySize

src/org/apache/pig/data/DefaultTuple.java:164–183

Determine the size of tuple in memory. This is used by data bags to determine their memory size. This need not be exact, but it should be a decent estimation. @return estimated memory size.

()

     * @return estimated memory size.
     */
    @Override
    public long getMemorySize() {
        Iterator<Object> i = mFields.iterator();

        // rest of the fixed portion of mfields size is accounted within empty_tuple_size
        long mfields_var_size = SizeUtil.roundToEight(4 + 4 * mFields.size());
        // in java hotspot 32bit vm, there seems to be a minimum tuple size of 96
        // which is probably from the minimum size of this array list
        mfields_var_size = Math.max(40, mfields_var_size);

        // fixed overhead = 48 bytes
        //8 - tuple object header
        //8 - mFields reference
        //32 - mFields array list fixed size
        long sum = 48 + mfields_var_size;
        while (i.hasNext()) {
            sum += SizeUtil.getPigObjMemSize(i.next());
        }
        return sum;
    }

    @Override
    public int compareTo(Object other) {