From: | "Pavel Stehule" <pavel(dot)stehule(at)gmail(dot)com> |
---|---|
To: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Proposal: generate_iterator functions |
Date: | 2007-10-18 05:20:29 |
Message-ID: | 162867790710172220n1ab51d83kc9392f0ed6178cdb@mail.gmail.com |
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Thread: | |
Lists: | pgsql-hackers |
Hello
this function can help with array's iteration.
create function generate_iterator(anyarray)
returns setof integer
as $$
select i
from generate_series(array_lower($1,1),
array_upper($1,1)) g(i)
$$ language sql;
-- multidimensional
create function generate_iterator(anyarray, integer)
returns setof integer
as $$
select generate_series(array_lower($1,$2),
array_upper($1,$2)) g(i)
$$ language sql;
It can be internal function, not only shortcut for generate_series
sample:
create function array_sort(anyarray)
returns anyarray
as $$
select array(select $1[i] from generate_iterator($1) order by 1)
$$ language sql;
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