Guillaume Smet <guillaume_ml(at)smet(dot)org> writes:
>> If so, can we see the pg_stats rows for the object_id and
>> parent_application_id columns?
> See attached file.
Well, those stats certainly appear to justify the planner's belief that
the indexscan needn't run very far: the one value of
parent_application_id is 1031 and this is below the smallest value of
object_id seen by analyze. You might have better luck if you increase
the statistics target for acs_objects.object_id. (It'd be interesting
to know what fraction of acs_objects actually does have object_id < 1032.)
regards, tom lane