Re: index prefetching

On Wed, Jul 16, 2025 at 10:20 AM Tomas Vondra <tomas@vondra.me> wrote:
> The read stream can only return blocks generated by the "next" callback.
> When we return the block for the last item on a leaf page, we can only
> return "InvalidBlockNumber" which means "no more blocks in the stream".
> And once we advance to the next leaf, we say "hey, there's more blocks".
> Which is what read_stream_reset() does.
>
> It's a bit like what rescan does.

That sounds weird.

> In an ideal world we'd have a function that'd "pause" the stream,
> without resetting the distance etc. But we don't have that, and the
> reset thing was suggested to me as a workaround.

Does the "complex" patch require a similar workaround? Why or why not?

--
Peter Geoghegan