public String getCellVisibility() {
        if (!hasCellVisibility()) {
          return null;
        } else {
          return Bytes.toString(lineBytes, getColumnOffset(cellVisibilityColumnIndex),
            getColumnLength(cellVisibilityColumnIndex));
        }
      }
@param columnsSpecification the list of columns to parser out, comma separated. The row key
                            should be the special token TsvParser.ROWKEY_COLUMN_SPEC
hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/ImportTsv.java