@Override
    public ExtendedCell peek() {
      this.count.incrementAndGet();
      return super.peek();
    }
Five rows by four columns distinguished by column qualifier (column qualifier is one of the
four rows... ONE, TWO, etc.). Exceptions are a weird row after TWO; it is TWO_POINT_TWO. And
then row FOUR has five columns finishing w/ row FIVE having a single column. We will use this
to test scan does the right thing as it we do Gets, StoreScanner#optimize, and what we do on
(faked) block boundaries.
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestStoreScanner.java