Re: intarray sort returns wrong result

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Junwang Zhao <zhjwpku(at)gmail(dot)com>
Cc: PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: intarray sort returns wrong result
Date: 2024-11-12 01:13:44
Message-ID: 1079628.1731374024@sss.pgh.pa.us
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Junwang Zhao <zhjwpku(at)gmail(dot)com> writes:
> While working on general array sort[1], I played with intarray
> extension, found a bug (or at least inconsistency) when sorting
> multidimensional int array:

> create extension intarray;
> select sort('{{1,2,3}, {2,3,4}}');

> this returns {{1,2,2},{3,3,4}} instead of {{1,2,3},{2,3,4}}

This is documented, isn't it?

Many of these operations are only sensible for one-dimensional
arrays. Although they will accept input arrays of more dimensions,
the data is treated as though it were a linear array in storage
order.

I don't think anyone will thank us for changing intarray's behavior
many years after the fact.

regards, tom lane

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