Re: Proposal to introduce a shuffle function to intarray extension

From: Martin Kalcher <martin(dot)kalcher(at)aboutsource(dot)net>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: Re: Proposal to introduce a shuffle function to intarray extension
Date: 2022-07-18 07:12:50
Message-ID: 1bebc445-842d-4594-3116-882a3cc13ede@aboutsource.net
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Am 18.07.22 um 01:20 schrieb Tom Lane:
>> I would expect that shuffle() only shuffles the first dimension and
>> keeps the inner arrays intact.
>
> This argument is based on a false premise, ie that Postgres thinks
> multidimensional arrays are arrays-of-arrays. They aren't, and
> we're not going to start making them so by defining shuffle()
> at variance with every other array-manipulating function. Shuffling
> the individual elements regardless of array shape is the definition
> that's consistent with our existing functionality.

Hey Tom,

thank you for clarification. I did not know that. I will make a patch
that is using deconstruct_array().

Martin

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