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Add trim_array() function.

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This has been in the SQL spec since 2008.  It's a pretty thin
wrapper around the array slice functionality, but the spec
says we should have it, so here it is.

Vik Fearing, reviewed by Dian Fay

Discussion: https://postgr.es/m/fc92ce17-9655-8ff1-c62a-4dc4c8ccd815@postgresfriends.org
This commit is contained in:
Tom Lane
2021-03-03 16:39:57 -05:00
parent 3769e11a31
commit 0a687c8f10
7 changed files with 100 additions and 2 deletions
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13
src/test/regress/sql/arrays.sql
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@@ -722,3 +722,16 @@ SELECT width_bucket(5, '{}');
SELECT width_bucket('5'::text, ARRAY[3, 4]::integer[]);
SELECT width_bucket(5, ARRAY[3, 4, NULL]);
SELECT width_bucket(5, ARRAY[ARRAY[1, 2], ARRAY[3, 4]]);
-- trim_array
SELECT arr, trim_array(arr, 2)
FROM
(VALUES ('{1,2,3,4,5,6}'::bigint[]),
('{1,2}'),
('[10:16]={1,2,3,4,5,6,7}'),
('[-15:-10]={1,2,3,4,5,6}'),
('{{1,10},{2,20},{3,30},{4,40}}')) v(arr);
SELECT trim_array(ARRAY[1, 2, 3], -1); -- fail
SELECT trim_array(ARRAY[1, 2, 3], 10); -- fail