Alvaro Herrera <alvherre@2ndquadrant.com> writes:
> On 2018-Nov-28, Tom Lane wrote:
>> This would also entail rather significant overhead to find out schema
>> names and interpolate them into the text.
> True. I was thinking that the qualified-names version of the query
> would be obtained via ruleutils or some similar mechanism to deparse
> from the parsed query tree (not from the original query text), where
> only pg_catalog is considered visible. This would be enabled using a
> GUC that defaults to off.
Color me skeptical --- ruleutils has never especially been designed
to be fast, and I can't see that the overhead of this is going to be
acceptable to anybody who needs pg_stat_statements in production.
(Some admittedly rough experiments suggest that we might be
talking about an order-of-magnitude slowdown for simple queries.)
regards, tom lane