Alvaro Herrera <alvherre@2ndquadrant.com> writes:
> I'm not sure what your point is. We know that for some cases the
> optimization barrier semantics are useful, which is why the proposal is
> to add a keyword to install one explicitely:
> with materialized r as
> (
> select json_populate_record(null::mytype, myjson) as x
> from mytable
> )
> select (x).*
> from r;
> this would preserve the current semantics.
Uh, no, it wouldn't, until you had changed your query (and made it
non-SQL-compliant, and unable to work at all on pre-v11 PG).
This might be a good design, but surely it does not provide backwards
compatibility.
regards, tom lane
