Carsten Kropf <ckropf2(at)fh-hof(dot)de> writes:
> I read somewhere, that this can be solved by preparing a operator class for btree and passing a comparison function for equality there. I did this with the following lines:
> CREATE OPERATOR CLASS pointnd_btree_class
> DEFAULT FOR TYPE pointnd USING btree AS
> OPERATOR 3 =(pointnd, pointnd)
> ;
You need an actual, usable btree operator class, not one-sixth of one ...
this is lacking the other four operators and the support function.
regards, tom lane