Re: Curiosity with catalog table array attribute index dimensions

From: Erik Jones <erik(at)myemma(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: PostgreSQL General <pgsql-general(at)postgresql(dot)org>
Subject: Re: Curiosity with catalog table array attribute index dimensions
Date: 2008-04-16 21:34:15
Message-ID: 0C0FE45A-BBE8-4D81-A4C5-A0E896E323DB@myemma.com
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On Apr 16, 2008, at 4:26 PM, Tom Lane wrote:
> Erik Jones <erik(at)myemma(dot)com> writes:
>> So, I noticed today that pg_index.indkey index values start at 0
>> instead of 1 as I'd expected. Are there other cases of this?
>> Shouldn't that be documented somewhere?
>
> Well, the CREATE TYPE manual page has
>
> For historical reasons (i.e., this is clearly wrong but it's far
> too
> late to change it), subscripting of fixed-length array types
> starts from
> zero, rather than from one as for variable-length arrays.
>
> oidvector and int2vector aren't fixed-length anymore, but they
> maintain
> their old behavior in this respect for backward compatibility.

Ah, thanks, at least now I know what to look for instead of using
trial and error.

Erik Jones

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erik(at)myemma(dot)com
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