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Add array_sample() and array_shuffle() functions.

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These are useful in Monte Carlo applications.

Martin Kalcher, reviewed/adjusted by Daniel Gustafsson and myself

Discussion: https://postgr.es/m/9d160a44-7675-51e8-60cf-6d64b76db831@aboutsource.net
This commit is contained in:
Tom Lane
2023-04-07 11:47:07 -04:00
parent cd82e5c79d
commit 888f2ea0a8
6 changed files with 284 additions and 2 deletions
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14
src/test/regress/sql/arrays.sql
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@@ -761,3 +761,17 @@ FROM
SELECT trim_array(ARRAY[1, 2, 3], -1); -- fail
SELECT trim_array(ARRAY[1, 2, 3], 10); -- fail
SELECT trim_array(ARRAY[]::int[], 1); -- fail
-- array_shuffle
SELECT array_shuffle('{1,2,3,4,5,6}'::int[]) <@ '{1,2,3,4,5,6}';
SELECT array_shuffle('{1,2,3,4,5,6}'::int[]) @> '{1,2,3,4,5,6}';
SELECT array_dims(array_shuffle('[-1:2][2:3]={{1,2},{3,NULL},{5,6},{7,8}}'::int[]));
SELECT array_dims(array_shuffle('{{{1,2},{3,NULL}},{{5,6},{7,8}},{{9,10},{11,12}}}'::int[]));
-- array_sample
SELECT array_sample('{1,2,3,4,5,6}'::int[], 3) <@ '{1,2,3,4,5,6}';
SELECT array_length(array_sample('{1,2,3,4,5,6}'::int[], 3), 1);
SELECT array_dims(array_sample('[-1:2][2:3]={{1,2},{3,NULL},{5,6},{7,8}}'::int[], 3));
SELECT array_dims(array_sample('{{{1,2},{3,NULL}},{{5,6},{7,8}},{{9,10},{11,12}}}'::int[], 2));
SELECT array_sample('{1,2,3,4,5,6}'::int[], -1); -- fail
SELECT array_sample('{1,2,3,4,5,6}'::int[], 7); --fail