| From: | Surafel Temesgen <surafel3000(at)gmail(dot)com> |
|---|---|
| To: | Simon Riggs <simon(dot)riggs(at)enterprisedb(dot)com> |
| Cc: | Ryan Lambert <ryan(at)rustprooflabs(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, Rémi Lapeyre <remi(dot)lapeyre(at)lenstra(dot)fr>, Eli Marmor <eli(at)netmask(dot)it>, David Steele <david(at)pgmasters(dot)net>, Vik Fearing <vik(dot)fearing(at)2ndquadrant(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Georgios <gkokolatos(at)protonmail(dot)com> |
| Subject: | Re: WIP: System Versioned Temporal Table |
| Date: | 2021-01-15 16:56:42 |
| Message-ID: | CALAY4q8Pp699qv-pJZc4toS-e2NzRJKrvaX-xqG1aqj2Q+Ww-w@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Jan 15, 2021 at 12:22 AM Simon Riggs <simon(dot)riggs(at)enterprisedb(dot)com>
wrote:
> SELECT * FROM foo FOR SYSTEM_TIME AS OF ...
> should NOT include the Start and End timestamp columns
> because this acts like a normal query just with a different snapshot
> timestamp
>
> SELECT * FROM foo FOR SYSTEM_TIME BETWEEN x AND y
> SHOULD include the Start and End timestamp columns
> since this form of query can include multiple row versions for the
> same row, so it makes sense to see the validity times
>
>
One disadvantage of returning system time columns is it
breaks upward compatibility. if an existing application wants to
switch to system versioning it will break.
regards
Surafel
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