BUG #17502: View based on window functions returns wrong results when queried

From: PG Bug reporting form <noreply(at)postgresql(dot)org>
To: pgsql-bugs(at)lists(dot)postgresql(dot)org
Cc: daniel(dot)farkas(at)datoris(dot)com
Subject: BUG #17502: View based on window functions returns wrong results when queried
Date: 2022-05-28 22:54:18
Message-ID: 17502-281a7aaacfaa872a@postgresql.org
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The following bug has been logged on the website:

Bug reference: 17502
Logged by: Daniel Farkaš
Email address: daniel(dot)farkas(at)datoris(dot)com
PostgreSQL version: 10.10
Operating system: Linux


Please be gentle, I've never been in contact with Postgres developers.
In short, I've created a view, which has rather sketchy window functions,
but it gives me results I need.
When I do select * on it, it gives me what I expect. One of the columns has
five distinct values.
But when I do group by on that column, it gives me only one of the values.
When I drop the view and create materialized view, all is good, I get all
five values.

My guess is that some parts of the inner select are affecting outer, view's
select, which is not something I would expect.
My current Postgres is PostgreSQL 10.10 on x86_64-pc-linux-musl, compiled by
gcc (Alpine 8.3.0) 8.3.0, 64-bit.
If you think this is worth investigating further, I will try composing a
simpler example, and test it in a more recent Postgres version.
Maybe it's a known limitation I'm not aware of.

Let me know what you think.



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