Method fixQualifierFlags

src/core/Internal.java:535–544

Fix the flags inside the last byte of a qualifier. OpenTSDB used to not rely on the size recorded in the flags being correct, and so for a long time it was setting the wrong size for floating point values (pretending they were encoded on 8 bytes when in fact they were on 4). So overwrite these

(byte flags, final int val_len)

   * @return The least significant byte of the qualifier with correct flags.
   */
  public static byte fixQualifierFlags(byte flags, final int val_len) {
    // Explanation:
    //   (1) Take the last byte of the qualifier.
    //   (2) Zero out all the flag bits but one.
    //       The one we keep is the type (floating point vs integer value).
    //   (3) Set the length properly based on the value we have.
    return (byte) ((flags & ~(Const.FLAGS_MASK >>> 1)) | (val_len - 1));
    //              ^^^^^   ^^^^^^^^^^^^^^^^^^^^^^^^^    ^^^^^^^^^^^^^
    //               (1)               (2)                    (3)
  }
  
  /**
   * Returns whether or not this is a floating value that needs to be fixed.