Re: any way for ORDER BY x to imply NULLS FIRST in 8.3? - Mailing list pgsql-general

From Gregory Stark
Subject Re: any way for ORDER BY x to imply NULLS FIRST in 8.3?
Date
Msg-id 87640dx4ek.fsf@oxford.xeocode.com
Whole thread Raw
In response to Re: any way for ORDER BY x to imply NULLS FIRST in 8.3?  (Tom Lane <tgl@sss.pgh.pa.us>)
Responses Re: any way for ORDER BY x to imply NULLS FIRST in 8.3?  (Tom Lane <tgl@sss.pgh.pa.us>)
List pgsql-general
"Tom Lane" <tgl@sss.pgh.pa.us> writes:

> Simon Riggs <simon@2ndquadrant.com> writes:
>> Perhaps we can have a parameter?
>> default_null_sorting = 'last' # may alternatively be set to 'first'
>
> Not unless it's locked down at initdb time.  Otherwise flipping the
> value bars you from using every existing index ... including those
> on the system catalogs ... which were made with the other setting.

Surely if we added this we would also add explicit NULLS LAST clauses to all
system catalog indexes and system views and make explicitly constructed scans
in the backend use NULLS LAST.

--
  Gregory Stark
  EnterpriseDB          http://www.enterprisedb.com
  Ask me about EnterpriseDB's 24x7 Postgres support!

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