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From: Tom Lane <[email protected]>
To: Michael Paquier <[email protected]>
Cc: jian he <[email protected]>
Cc: Kirill Reshke <[email protected]>
Cc: Peter Eisentraut <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: CREATE SCHEMA ... CREATE DOMAIN support
Date: Sun, 01 Dec 2024 21:15:23 -0500
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
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Michael Paquier <[email protected]> writes:
> If I'm parsing the spec right, the doc mentions in its 5)~6) of the
> syntax rules in CREATE SCHEMA that non-schema-qualified objects should
> use the new schema name defined in the CREATE SCHEMA query.  So that
> pretty much settles the rules to use when having a new object that has
> a reference to a non-qualified object created in the same CREATE
> SCHEMA query?

I don't see where you're getting that from?  DB2 says that unqualified
reference names (not to be confused with unqualified creation-target
names) are taken to be in the new schema, but I don't see any
corresponding restriction in the spec.

What I do see (11.1 SR 6 in SQL:2021) is:

    If <schema path specification> is not specified, then a <schema
    path specification> containing an implementation-defined <schema
    name list> that contains the <schema name> contained in <schema
    name clause> is implicit.

What I read this as is that the "search path" during schema-element
creation must include at least the new schema, but can also include
some other schemas as defined by the implementation.  That makes
our behavior compliant, because we can define the other schemas
as those in the session's prevailing search_path.  (DB2's behavior
is also compliant, but they're defining the path as containing only
the new schema.)

Also, if SQL intended to constrain the search path for unqualified
identifiers to be only the new schema, they'd hardly need a concept
of <schema path specification> at all.

			regards, tom lane

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