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From: Tom Lane <[email protected]>
To: Bruce Momjian <[email protected]>
Cc: KES <[email protected]>
Cc: PostgreSQL-development <[email protected]>
Subject: Re: Typo in doc or wrong EXCLUDE implementation
Date: Wed, 08 Aug 2018 09:51:28 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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Bruce Momjian <[email protected]> writes:
> On Wed, Aug  8, 2018 at 01:55:53PM +0300, KES wrote:
>> If such exclusion constraint would be marked as UNIQUE we can use it for FK while implementing temporal/bi-temporal tables.

> Yes, it would work, but doing that only for equality would be surprising
> to many people because exclusion constraints are more general than
> equality comparisons.

In general, we should be discouraging people from using EXCLUDE syntax
with simple equality operators, not encouraging them to do so.  It's
less efficient and less portable than a regular btree-based uniqueness
constraint.  So I think this proposal is a bad idea regardless of
whether it'd be technically feasible or not.

			regards, tom lane

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