Re: Add bms_offset_members() function for bitshifting Bitmapsets - Mailing list pgsql-hackers

From David Rowley
Subject Re: Add bms_offset_members() function for bitshifting Bitmapsets
Date
Msg-id CAApHDvp=fhr8ksuGyXkwYPXQpYvJ38YMhHvx6JmdD39cAvNRhw@mail.gmail.com
Whole thread
In response to Re: Add bms_offset_members() function for bitshifting Bitmapsets  (Tom Lane <tgl@sss.pgh.pa.us>)
Responses Re: Add bms_offset_members() function for bitshifting Bitmapsets
Re: Add bms_offset_members() function for bitshifting Bitmapsets
List pgsql-hackers
On Wed, 15 Apr 2026 at 14:30, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>
> David Rowley <dgrowleyml@gmail.com> 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.

David



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