Re: Couldn't cast to record[]

[Suresh Kumar R <suresh.arsenal29@xxxxxxxxx>]

Hi Merlin,

   I needed this because, I use postgres backend along with golang using pgx driver. When i query address i need to specify OID of address[](composite type). In my case i couldnt find the oid of that type since its dynamic. Needed generic type so needed to cast to record[] which has constant oid.

With regards 

Suresh kumar R

On Fri, 4 Mar, 2022, 11:28 pm Merlin Moncure, <mmoncure@xxxxxxxxx> wrote:

On Thu, Mar 3, 2022 at 4:01 AM Suresh Kumar R
<suresh.arsenal29@xxxxxxxxx> wrote:
>
> Hi, I created an table with composite type array as datatype for one column.
> When I query that table I need the pg_typeof(column) as record[] instead of
> composite_type[].
> I tried creating a separate function and returning record[], but below error
> is thrown,
>
> ERROR:  PL/pgSQL functions cannot return type record[]
>
> Below is sample for my requirement.
>
> pali=# create type address as (number bigint, city varchar);
> CREATE TYPE
> pali=# create table person(name varchar, addresses address[]);
> CREATE TABLE
> pali=# insert into person values ('Michael', array[(82, 'NYC'),(24,
> 'Dunkirk')]::address[]);
> INSERT 0 1
> pali=# select pg_typeof(addresses::record[]) from person ;
>  pg_typeof
> -----------
>  address[]
>
> Here I expect record[] instead of address[].


Why do you think you need this? If you need variant record storage,
you probably want to go to jsonb, then use jsonb_populate_recordset to
convert back to specific type.

merlin