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Add array_remove() and array_replace() functions.

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These functions support removing or replacing array element value(s)
matching a given search value.  Although intended mainly to support a
future array-foreign-key feature, they seem useful in their own right.

Marco Nenciarini and Gabriele Bartolini, reviewed by Alex Hunsaker
This commit is contained in:
Tom Lane
2012-07-11 13:59:35 -04:00
parent f9951252db
commit 84a42560c8
7 changed files with 415 additions and 1 deletions
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11
src/test/regress/sql/arrays.sql
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@@ -432,6 +432,17 @@ select unnest(array[1,2,3,4.5]::float8[]);
select unnest(array[1,2,3,4.5]::numeric[]);
select unnest(array[1,2,3,null,4,null,null,5,6]);
select unnest(array[1,2,3,null,4,null,null,5,6]::text[]);
select array_remove(array[1,2,2,3], 2);
select array_remove(array[1,2,2,3], 5);
select array_remove(array[1,NULL,NULL,3], NULL);
select array_remove(array['A','CC','D','C','RR'], 'RR');
select array_remove('{{1,2,2},{1,4,3}}', 2); -- not allowed
select array_replace(array[1,2,5,4],5,3);
select array_replace(array[1,2,5,4],5,NULL);
select array_replace(array[1,2,NULL,4,NULL],NULL,5);
select array_replace(array['A','B','DD','B'],'B','CC');
select array_replace(array[1,NULL,3],NULL,NULL);
select array_replace(array['AB',NULL,'CDE'],NULL,'12');
-- Insert/update on a column that is array of composite