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help / color / mirror / Atom feedFrom: Peter Eisentraut <[email protected]>
To: David Rowley <[email protected]>
To: Tom Lane <[email protected]>
Cc: Chao Li <[email protected]>
Cc: PostgreSQL Developers <[email protected]>
Subject: Re: Add bms_offset_members() function for bitshifting Bitmapsets
Date: Wed, 15 Apr 2026 21:17:12 +0200
Message-ID: <[email protected]> (raw)
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On 15.04.26 04:33, David Rowley wrote:
> On Wed, 15 Apr 2026 at 14:30, Tom Lane <[email protected]> wrote:
>>
>> David Rowley <[email protected]> writes:
>>> I'd not considered surprise-prone as an aspect. I understand we have
>>> bms_join and bms_union, which do the same thing if you only care about
>>> the value of the result and not what happens to the inputs.
>>
>> Sure, but bms_join is an optional optimization of the far safer
>> bms_union operation. It bothers me to create the optimized case
>> but not the base case.
>
> Hmm, yeah. That seems like a good argument for making a new set. I'll
> go make it so.
Depending on what you end up doing, maybe a sprinkling of pg_nodiscard
could be appropriate.
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Subject: Re: Add bms_offset_members() function for bitshifting Bitmapsets
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