Re: Couldn't cast to record[]

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(at)gmail(dot)com> wrote:

> On Thu, Mar 3, 2022 at 4:01 AM Suresh Kumar R
> <suresh(dot)arsenal29(at)gmail(dot)com> 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
>