Josh, Tom,

Thanks for your explanations.

In the meantime it seems like the quickest answer for Guillaume might
be to try to avoid keeping any NULLs in parent_application_id.

I can't do that as the majority of the applications don't have any parent one. Moreover, we use a third party application and we cannot modify all its internals.

Anyway, I tried to work on the statistics as you told me and here are the results:
ccm_perf=# ALTER TABLE acs_objects ALTER COLUMN object_id SET STATISTICS 30;
ccm_perf=# ANALYZE acs_objects;

ccm_perf=# \i query_section.sql
... correct plan ...
 Total runtime: 0.555 ms

So I think I will use this solution for the moment.

Thanks a lot for your help.



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