| From: | John Naylor <john(dot)naylor(at)enterprisedb(dot)com> |
|---|---|
| To: | Bauyrzhan Sakhariyev <baurzhansahariev(at)gmail(dot)com> |
| Cc: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: truncating timestamps on arbitrary intervals |
| Date: | 2021-07-22 17:28:38 |
| Message-ID: | CAFBsxsE1D8buF1xeGFi6FYghxEhnoBGHAngDE52KK-8O2KOd4g@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, Jul 22, 2021 at 12:24 PM Bauyrzhan Sakhariyev <
baurzhansahariev(at)gmail(dot)com> wrote:
>
> Is date_bin supposed to return the beginning of the bin?
Thanks for testing! And yes.
> And does the sign of an interval define the "direction" of the bin?
No, the boundary is intentionally the earlier one:
/*
* Make sure the returned timestamp is at the start of the bin, even if
* the origin is in the future.
*/
if (origin > timestamp && stride_usecs > 1)
tm_delta -= stride_usecs;
I wonder if we should just disallow negative intervals here.
--
John Naylor
EDB: http://www.enterprisedb.com
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