| From: | Sergey Zaharchenko <doublef(dot)mobile(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Query plan optimization: sorting vs. partitioning |
| Date: | 2011-02-02 15:30:00 |
| Message-ID: | AANLkTi=byszq8WwPq6Tn7=h90+eHLdMCteyA2PQ4Wt2p@mail.gmail.com |
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| Lists: | pgsql-general |
2011/2/2, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>:
>> I see the database doesn't understand that there are no entries in the
>> main table, so it has to assume the Append data is not ordered. Is
>> there a way to avoid sorting?
>
> No. In existing releases there is no plan type that can produce
> presorted output from an append relation (ie, an inheritance tree).
> 9.1 will be able to do that, but it wasn't exactly a small fix:
> http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=11cad29c91524aac1d0b61e0ea0357398ab79bf8
OK, I hope I'll be able to come up with a stored procedure to query
the tables directly, then. Thanks!
--
DoubleF
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