| From: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> |
|---|---|
| To: | troy(at)frericks(dot)us, Pg Docs <pgsql-docs(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: I came here to determine how much storage a boolean variable uses |
| Date: | 2021-08-30 15:31:04 |
| Message-ID: | CAKFQuwbjzdq6X0LSPva6GS2PYiBchDdr-bJeOXyuWb87j+7uLw@mail.gmail.com |
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| Lists: | pgsql-docs |
On Sun, Aug 29, 2021 at 11:59 PM PG Doc comments form <
noreply(at)postgresql(dot)org> wrote:
> The following documentation comment has been logged on the website:
>
> Page: https://www.postgresql.org/docs/13/datatype.html
> Description:
>
> I'd like to see a fourth column added to Table 8-1 that contains the size
> or
> size range of the data type.
I would argue this is sufficiently provided by the pg_attribute catalog's
attlen and attalign fields, as pointed to on the same page linked below.
Maybe a note about the amount of space in the
> row that a NULL column uses vs a NOT NULL.
>
>
Implementation detail that is covered in the internals section:
https://www.postgresql.org/docs/current/storage-page-layout.html#STORAGE-TUPLE-LAYOUT
David J.
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