(2014/07/01 16:04), Ashutosh Bapat wrote:
> On Tue, Jul 1, 2014 at 12:25 PM, Etsuro Fujita
> <fujita.etsuro@lab.ntt.co.jp <mailto:fujita.etsuro@lab.ntt.co.jp>> wrote:
> Maybe I'm missing something, but what's the point of using the
> tlist, not reltargetlist?
> Compliance with other create_*scan_plan() functions. The tlist passed to
> those functions is sometimes preprocessed in create_scan_plan() and some
> of the function it calls. If we use reltargetlist directly, we loose
> that preprocessing. I have not see any of create_*scan_plan() fetch the
> targetlist directly from RelOptInfo. It is always the one supplied by
> build_path_tlist() or disuse_physical_tlist() (which in turn calls
> build_path_tlist()) or build_physical_tlist().
I've got the point.
As I said upthread, I'll work on calculating attr_needed for child rels,
and I hope that that will eliminate your concern.
Thanks,
Best regards,
Etsuro Fujita