> I'm not sure it is usefull in release notes since it is more about API, and not > user-facing change. Just in case. > GiST opclasses now can omit compress and decompress functions. If compress > function is omited, IndexOnlyScan is enabled for opclass without any extra > change. > https://github.com/postgres/postgres/commit/ > d3a4f89d8a3e500bd7c0b7a8a8a5ce1b47859128
Uh, we do have this for SP-GiST:
Allow SP-GiST indexes to optionally use compression (Teodor Sigaev, Heikki Linnakangas, Alexander Korotkov, Nikita Glukhov)
I am unclear how far downt the API stack I should go in documenting changes like this.
It is also a bit misleading - the idea in that change is that now index representation can be a lossy version of actual data type (a box instead of polygon as a referende, so a changelog entry can tell "Allow SP-GiST index creation for polygon datatype."). There is no "decompression" for such thing. "compression" sounds like gzip for me in user-facing context.
