int columnCount = ((Integer)row.get(COLUMN_COUNT_FIELD_INDEX)).intValue();
int itemNumber = ((Integer)row.get(ITEM_NUMBER_FIELD_INDEX)).intValue();
String keyString = (String)row.get(KEY_STRING_FIELD_INDEX);
WrappingByteSource byteSource = (WrappingByteSource)row.get(KEY_BYTES_FIELD_INDEX);
byte[] keyBytes = byteSource.toByteSubarray();
long eqCount = (Long)row.get(EQ_COUNT_FIELD_INDEX);
long ltCount = (Long)row.get(LT_COUNT_FIELD_INDEX);
long distinctCount = (Long)row.get(DISTINCT_COUNT_FIELD_INDEX);