Jim Nasby escribió:
> One thing users will lose in this patch is the ability to reliably see if a 
> tuple is frozen via SQL. Today you can do that just by selecting xmin from 
> the table.
> Obviously people don't generally need to do that... but it's one of those 
> things that when you do need it it's incredibly handy to have... would it be 
> difficult to expose infomask(2) via SQL, the same way xmin et all are?

It's already exposed via the pageinspect extension.  It's doubtful that
there are many valid cases where you need infomask but don't have access
to that module.

The real fix seems to ensure that the module is always available.

Álvaro Herrera                http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services

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