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Re: Query plan optimization: sorting vs. partitioning

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2011/2/2, Tom Lane <tgl@xxxxxxxxxxxxx>:

>> 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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