Alexander Korotkov <a.korotkov@postgrespro.ru> writes:
> I think Connor struggles to implement just an operator class. Advising him
> to implement an index access method is a good way to get him away of
> PostgreSQL hacking for a long time :)
Yeah. To answer the question a bit more directly: there are not any
contrib modules that add SP-GiST opclasses, but there are some that add
GiST or GIN opclasses, so any one of those would serve as a model for the
basic mechanism of writing an extension. Just replace the AM-specific
support functions for those AMs with the ones SP-GiST uses. (You can crib
some code details from the in-core SP-GiST support functions.)
regards, tom lane
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