Blob equals issue

[msosnicki]

Currently Blob has three variants, two of which define equals in the following way:

    override def equals(other: Any): Boolean = {
      other.isInstanceOf[ByteBufferBlob] &&
      buf.compareTo(other.asInstanceOf[ByteBufferBlob].buf) == 0
    }

meaning that ArraySliceBlob will never be equal to ByteBufferBlob.

In addition to that, QueueBlob does not define equals and hashCode at all.

[Olivier Mélois]

The absence of equals and hashCode in QueueBlob is indeed a bug.

However, the fact that equals takes into consideration the underlying structure is by design. If you're looking to compare the bytes of two blobs, you should use sameBytesAs

[msosnicki]

Do you have an example of scenario where it is useful to know the exact underlying type of a Blob and take it into consideration when using equals? Noticed that the types themselves are not hidden as well, so it's visible now that it didn't happen by accident. Thanks

[Olivier Mélois]

I suppose we could implement the equals method using sameBytesAs, it would be less of a surprising behaviour for users. Comparisons that need to be structure aware can inspect the structure.

PR away, if you want

[msosnicki]

Ok, will raise one today