On 14.11.24 15:35, Noah Misch wrote: > The postgr.es/c/e54a42a standard would have us stop here. But I'm open to > treating the standard as mistaken and changing things.
That text explicitly calls out that adding struct members at the end of a struct is considered okay. But thinking about it now, even adding fields to the end of a node struct that extensions allocate using makeNode() is an ABI break that is liable to cause all affected extensions to break in a crashing way.
I think it was mentioned elsewhere, but this wouldn't be a problem if makeNode was not a macro.