| From: | hubert depesz lubaczewski <depesz(at)depesz(dot)com> |
|---|---|
| To: | Jeff Amiel <becauseimjeff(at)yahoo(dot)com> |
| Cc: | "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: Why does row estimation on nested loop make no sense to me |
| Date: | 2013-05-18 08:39:29 |
| Message-ID: | 20130518083929.GA9335@depesz.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
Not sure if it helps, but it's apparently not a very rare thing.
Quick analysis on data from explain.depesz.com showed that > 12% of
plans with nested loop have such estimate.
Couple of examples:
http://explain.depesz.com/s/Qm4
http://explain.depesz.com/s/qmW
http://explain.depesz.com/s/qnG
http://explain.depesz.com/s/QO
http://explain.depesz.com/s/qov
http://explain.depesz.com/s/qqb
http://explain.depesz.com/s/QqF
http://explain.depesz.com/s/qQO
http://explain.depesz.com/s/qrI
http://explain.depesz.com/s/QRK
http://explain.depesz.com/s/QUX9
http://explain.depesz.com/s/QvN
http://explain.depesz.com/s/QWL
http://explain.depesz.com/s/r4F
http://explain.depesz.com/s/R7q
http://explain.depesz.com/s/r8
http://explain.depesz.com/s/R8
http://explain.depesz.com/s/RaB
http://explain.depesz.com/s/RbV
http://explain.depesz.com/s/Rc7
all these plans are public and not anonymized.
depesz
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