Robert Haas <robertmhaas@gmail.com> writes:
> On Tue, Jun 13, 2017 at 11:53 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> But it needs to be changeable, unless you like the proposition that we
>> can never replan a query inside a trigger on the basis of new information
>> about how big the transition table is. Even if you're okay with that
>> particular restriction, the NamedTupleStore stuff is supposed to be
>> flexible enough to accommodate other use-cases, and some of them will
>> surely not be okay with an immutable estimate for the store's size.
> Hmm, true. But even if we extracted enrtuples from the
> RangeTbleEntry, there wouldn't be any mechanism to actually trigger
> such a replan, would there?
You're just pointing out that there's a lot of unfinished work around
this mechanism. I don't think anybody has claimed otherwise.
regards, tom lane