public long decodeLong(PositionedByteRange src) {
    return OrderedBytes.decodeNumericAsLong(src);
  }
Read a {@code long} value from the buffer {@code src}.
@param src the {@link PositionedByteRange} to read the {@code long} from
@return the {@code long} read from the buffer
hbase-common/src/main/java/org/apache/hadoop/hbase/types/OrderedNumeric.java