public static long addContent(final Region r, final byte[] columnFamily, final byte[] column)
    throws IOException {
    byte[] startKey = r.getRegionInfo().getStartKey();
    byte[] endKey = r.getRegionInfo().getEndKey();
    byte[] startKeyBytes = startKey;
    if (startKeyBytes == null || startKeyBytes.length == 0) {
      startKeyBytes = START_KEY_BYTES;
    }
    return addContent(new RegionAsTable(r), Bytes.toString(columnFamily), Bytes.toString(column),
      startKeyBytes, endKey, -1);
  }
Add content to region <code>r</code> on the passed column <code>column</code>. Adds data of the
from 'aaa', 'aab', etc where key and value are the same.
@return count of what we added.
hbase-server/src/test/java/org/apache/hadoop/hbase/HTestConst.java