Re: Add support for AT LOCAL - Mailing list pgsql-hackers

From Alvaro Herrera
Subject Re: Add support for AT LOCAL
Date
Msg-id 20230612153707.sddawpenlaxo73aw@alvherre.pgsql
Whole thread Raw
In response to Re: Add support for AT LOCAL  (Laurenz Albe <laurenz.albe@cybertec.at>)
Responses Re: Add support for AT LOCAL
List pgsql-hackers
On 2023-Jun-06, Laurenz Albe wrote:

> At a quick glance, it looks like you resolve "timezone" at the time
> the query is parsed.  Shouldn't the resolution happen at query
> execution time?

Sounds like it -- consider the case where the timestamp value is a
partition key and one of the partition boundaries falls in between two
timezone offsets for some particular ts value; then you use a prepared
query to read from a view defined with AT LOCAL.  Partition pruning
would need to compute partitions to read from at runtime, not plan time.

-- 
Álvaro Herrera        Breisgau, Deutschland  —  https://www.EnterpriseDB.com/



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