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Add generate_subscripts, a series-generation function which generates an

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array's subscripts.

Pavel Stehule, some editorialization by me.
This commit is contained in:
Alvaro Herrera
2008-04-28 14:48:58 +00:00
parent a1d479f518
commit 1fcb977a13
7 changed files with 253 additions and 6 deletions
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17
src/test/regress/sql/arrays.sql
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@ -340,3 +340,20 @@ select c2[2].f2 from comptable;
drop type _comptype;
drop table comptable;
drop type comptype;
create or replace function unnest1(anyarray)
returns setof anyelement as $$
select $1[s] from generate_subscripts($1,1) g(s);
$$ language sql immutable;
create or replace function unnest2(anyarray)
returns setof anyelement as $$
select $1[s1][s2] from generate_subscripts($1,1) g1(s1),
generate_subscripts($1,2) g2(s2);
$$ language sql immutable;
select * from unnest1(array[1,2,3]);
select * from unnest2(array[[1,2,3],[4,5,6]]);
drop function unnest1(anyarray);
drop function unnest2(anyarray);