BUG #18523: String compare not consistent

From: PG Bug reporting form <noreply(at)postgresql(dot)org>
To: pgsql-bugs(at)lists(dot)postgresql(dot)org
Cc: patrick(dot)van(dot)dijk(at)gmail(dot)com
Subject: BUG #18523: String compare not consistent
Date: 2024-06-26 09:43:42
Message-ID: 18523-d7b3cacb64d91cda@postgresql.org
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The following bug has been logged on the website:

Bug reference: 18523
Logged by: Patrick van Dijk
Email address: patrick(dot)van(dot)dijk(at)gmail(dot)com
PostgreSQL version: 16.3
Operating system: Windows vs Linux/Azure
Description:

When I try the following on a Azure/Linux version of PostgreSQL i see some
strange results that are not correct.
On Windows the behavior is correct.

select '|' < '0'; -- true, true, this is correct
select '|1' < '01'; -- false, true, Azure/Linux is wrong
select '||' < '0|'; -- true, true, this is correct
select '||1' < '0|1'; -- false, true, Azure/Linux is wrong

When the first character compares <, then no matter what follows, it should
be <...

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