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From: Peter Eisentraut <[email protected]>
To: Tom Lane <[email protected]>
Cc: Susanne Ebrecht <[email protected]>
Cc: Ingmar Brouns <[email protected]>
Cc: [email protected]
Subject: Re: BUG #5926: information schema dtd_identifier for element_types, columns, parameters views inconsistent
Date: Thu, 09 Jun 2011 18:00:30 +0300
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>
	<[email protected]>

On ons, 2011-06-08 at 11:09 -0400, Tom Lane wrote:
> As far as I can tell from the spec, dtd_identifier
> ought to be the identifier of the element type, while
> collection_type_identifier should be a made-up identifier for the
> array type.  That would make the sample query given in the docs
> correct.

But it's collection_type_identifier that you join against, say, columns,
so you can resolve the element type of column types.  So
collection_type_identifier must match the dtd_identifier schema of
columns etc., whereas element_types.dtd_identifier is not joinable
against anything.

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