From: Tom Lane <tgl@sss.pgh.pa.us>
To: Bruce Momjian <bruce@momjian.us>
Cc: pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: doc: add examples of creative use of unique expression indexes
Date: Fri, 10 Apr 2020 19:21:29 -0400
Message-ID: <13031.1586560889@sss.pgh.pa.us> (raw)
In-Reply-To: <20200410214821.GC24988@momjian.us>
References: <E1ikvbp-0005jW-E9@gemulon.postgresql.org>
<2304.1586532634@sss.pgh.pa.us>
<20200410214821.GC24988@momjian.us>
Bruce Momjian <bruce@momjian.us> writes:
> I agree with your analysis. I still want to have some mention that
> partial indexes can be used to create single-NULL columns, which might
> be required for compatibility with other databases. Attached is an
> updated patch which removes the previous commit but adds a mention of
> this.
The single-null thing is probably a useful example, but please make
it an actual separate example, or at least its own para outside the
existing <example> sections.
Also, the existing example demonstrating that seems overcomplicated;
why not just
create unique index ... (1) where (foo is null);
regards, tom lane
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To: pgsql-committers@postgresql.org
Cc: tgl@sss.pgh.pa.us, bruce@momjian.us, pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: doc: add examples of creative use of unique expression indexes
In-Reply-To: <13031.1586560889@sss.pgh.pa.us>
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