public double decodeDouble(PositionedByteRange src) {
    return OrderedBytes.decodeFloat64(src);
  }
Read a {@code double} value from the buffer {@code src}.
@param src the {@link PositionedByteRange} to read the {@code double} from
@return the {@code double} floating-point value with the same bit pattern
hbase-common/src/main/java/org/apache/hadoop/hbase/types/OrderedFloat64.java