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From: Laurenz Albe <[email protected]>
To: Kim Johan Andersson <[email protected]>
To: [email protected]
Subject: Re: [PATCH] Add support function for containment operators
Date: Fri, 07 Jul 2023 13:20:41 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>

I wrote:
> You implement both "SupportRequestIndexCondition" and "SupportRequestSimplify",
> but when I experimented, the former was never called.  That does not
> surprise me, since any expression of the shape "expr <@ range constant"
> can be simplified.  Is the "SupportRequestIndexCondition" branch dead code?
> If not, do you have an example that triggers it?

I had an idea about this:
So far, you only consider constant ranges.  But if we have a STABLE range
expression, you could use an index scan for "expr <@ range", for example
Index Cond (expr >= lower(range) AND expr < upper(range)).

Yours,
Laurenz Albe

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