static CellComparator getInstance() {
    return CellComparatorImpl.COMPARATOR;
  }
A comparator for ordering cells in user-space tables. Useful when writing cells in sorted order
as necessary for bulk import (i.e. via MapReduce).
<p>
CAUTION: This comparator may provide inaccurate ordering for cells from system tables, and
should not be relied upon in that case.
hbase-common/src/main/java/org/apache/hadoop/hbase/CellComparator.java