Re: Proposal to introduce a shuffle function to intarray extension
Martin Kalcher <martin.kalcher@aboutsource.net>
From: Martin Kalcher <martin.kalcher@aboutsource.net>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Thomas Munro <thomas.munro@gmail.com>,
PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2022-07-18T07:12:50Z
Lists: pgsql-hackers, pgsql-general
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
Commits
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Add array_sample() and array_shuffle() functions.
- 888f2ea0a81f 16.0 landed
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Use a separate random seed for SQL random()/setseed() functions.
- 6645ad6bdd81 12.0 cited