array sort for varchar arrays?

I'm likely overlooking something, but I can't seem to find a function to
sort a varchar array. Something like "select
sort('{y,z,x}'::varchar[])" => {'x','y','z'}.

You've got it right. On Pg 8.3.3 I get
SELECT sort(array['z','y','x']) -> {x,y,z}

2008/7/8 Matthew Dennis <mdennis@merfer.net>:

I'm likely overlooking something, but I can't seem to find a function to
sort a varchar array. Something like "select sort('{y,z,x}'::varchar[])" =>
{'x','y','z'}.

create function sort(anyarray)
returns anyarray as $$
select array(select $1[i] from generate_series(array_lower($1,1),
array_upper($1,1)) g(i) order by 1)
$$ language sql strict immutable;

postgres=# select sort(array[1,2,3,1]);
sort
-----------
{1,1,2,3}
(1 row)

postgres=# select sort(array['a','b','c','a']);
sort
-----------
{a,a,b,c}
(1 row)

Regards
Pavel Stehule

I'm likely overlooking something, but I can't seem to find a function
to sort a varchar array. Something like "select
sort('{y,z,x}'::varchar[])" => {'x','y','z'}.

You've got it right. On Pg 8.3.3 I get
SELECT sort(array['z','y','x']) -> {x,y,z}

Crap. There's a sort function included for int[]. I tried it on a
varchar[] and it worked, but that was because I had made a function that
was pretty much what pavel posted.

On Wed, Jul 9, 2008 at 12:28 AM, Pavel Stehule <pavel.stehule@gmail.com>
wrote:

2008/7/8 Matthew Dennis <mdennis@merfer.net>:

I'm likely overlooking something, but I can't seem to find a function to
sort a varchar array. Something like "select sort('{y,z,x}'::varchar[])"

=>

{'x','y','z'}.

create function sort(anyarray)
returns anyarray as $$
select array(select $1[i] from generate_series(array_lower($1,1),
array_upper($1,1)) g(i) order by 1)
$$ language sql strict immutable;

postgres=# select sort(array[1,2,3,1]);
sort
-----------
{1,1,2,3}
(1 row)

postgres=# select sort(array['a','b','c','a']);
sort
-----------
{a,a,b,c}
(1 row)

Regards
Pavel Stehule

Thanks Pavel, I ended up writing a method pretty much like that. It seems
like that would be inefficient though (works ok for my use though). Does
anyone know if there are future plans to add an array_sort method?

2008/7/9 Matthew Dennis <mdennis@merfer.net>:

On Wed, Jul 9, 2008 at 12:28 AM, Pavel Stehule <pavel.stehule@gmail.com>
wrote:

2008/7/8 Matthew Dennis <mdennis@merfer.net>:

I'm likely overlooking something, but I can't seem to find a function to
sort a varchar array. Something like "select
sort('{y,z,x}'::varchar[])" =>
{'x','y','z'}.

create function sort(anyarray)
returns anyarray as $$
select array(select $1[i] from generate_series(array_lower($1,1),
array_upper($1,1)) g(i) order by 1)
$$ language sql strict immutable;

postgres=# select sort(array[1,2,3,1]);
sort
-----------
{1,1,2,3}
(1 row)

postgres=# select sort(array['a','b','c','a']);
sort
-----------
{a,a,b,c}
(1 row)

Regards
Pavel Stehule

Thanks Pavel, I ended up writing a method pretty much like that. It seems
like that would be inefficient though (works ok for my use though). Does
anyone know if there are future plans to add an array_sort method?

Hello,

I don't know about it. You should rewrite code from intarray contrib
module and modify it for varchars. With varchars it could be little
bit more work - maybe one day.

Regards
Pavel Stehule