Re: unnesting multirange data types

()On Sat, Jun 12, 2021 at 2:30 AM Justin Pryzby <pryzby@telsasoft.com> wrote:
> On Fri, Jun 11, 2021 at 11:37:58PM +0300, Alexander Korotkov wrote:
> > On Fri, Jun 11, 2021 at 1:04 AM Justin Pryzby <pryzby@telsasoft.com> wrote:
> > >
> > > +{ oid => '1293', descr => 'expand mutlirange to set of ranges',
> > >
> > > typo: mutlirange
> >
> > Fixed, thanks.
> >
> > The patch with the implementation of both unnest() and cast to array
> > is attached.  It contains both tests and docs.
>
> |+   The multirange could be explicitly cast to the array of corresponding
> should say: "can be cast to an array of corresponding.."
>
> |+ * Cast multirange to the array of ranges.
> I think should be: *an array of ranges

Thank you for catching this.

> Per sqlsmith, this is causing consistent crashes.
> I took one of its less appalling queries and simplified it to this:
>
> select
> pg_catalog.multirange_to_array(
>     cast(pg_catalog.int8multirange() as int8multirange)) as c2
> from (select 1)x;

It seems that multirange_to_array() doesn't handle empty multiranges.
I'll post an updated version of the patch tomorrow.

------
Regards,
Alexander Korotkov