Re: questions about how to implement a gist index

Hi Oleg,

On Tue, Jun 28, 2016 at 1:05 AM, Oleg Bartunov <obartunov(at)gmail(dot)com> wrote:

> On Tue, Jun 28, 2016 at 12:44 AM, Riccardo Vianello
> <riccardo(dot)vianello(at)gmail(dot)com> wrote:
> > Could you please also help me understand the difference (if any) between
> > using the GIST_LEAF macro or the leafkey attribute of the GISTENTRY data
> > structure?
>
> Yes, this is confused.
>
> GIST_LEAF is TRUE if key is in leaf page.
>
> bool leafkey points if TRUE that key contains value from heap.
>

I think I wrongly assumed that internal and leaf nodes are homogeneously
filled with union and indexed values respectively. Is it correct that
leafkey is always TRUE for the entries that populate a leaf page, and may
be either TRUE and FALSE if GIST_LEAF is FALSE?

Thanks,
Riccardo