Re: Comparing Datum's at aminsert() stage

* Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> [19.04.2005 19:48]:
> That's probably what you *have* to use, since the normal deconstructors
> assume they are working with heap tuples, which are different. But I
> don't understand why you are waiting till after the index tuple is
> formed. The aminsert function gets an array of Datums to start with.
> Why not do it there?

Well, I need that exactly in aminsert.

Each value is stored only once in the index (along with it's own
series-of-bits). Thus, I need to compare each Datum from aminsert()'s
array with the existing ones.

Also, I cannot form tuple the ordinary way (I need all values separated),
so I copy each TuplDesc->attrs[i] into temporary TupleDesc (1 attribute big)
and call heap_fill_tuple(). Actually, I'm not sure this is the right way...

I think, storing some kind of hash-value from the Datum is a good idea, but
it's need to be unique. Is it possible with any existing API?

--

Victor Y. Yegorov