Re: pgsql: arrays: tighten checks for multi-dimensional input

On Tue, Feb  4, 2014 at 11:21:24AM -0800, Jeff Davis wrote:
> On Sat, 2014-02-01 at 15:49 +0000, Bruce Momjian wrote:
> > arrays:  tighten checks for multi-dimensional input
> >
> > Previously an input array string that started with a single-element
> > array dimension would then later accept a multi-dimensional segment.
> >
> > BACKWARD INCOMPATIBILITY
>
> -select cardinality('{{{1}},{{2,3},{3,4}}}'::int[]);
> +select cardinality('{{{1,9},{5,6}},{{2,3},{3,4}}}'::int[]);
>   cardinality
>  -------------
>             8
>
> I was a little confused by this change: the query changed, but the
> results did not. Was that a bugfix, or were the original semantics
> intentional?

Yes. the problem was that the new checking would throw an error for that
misformed array.

> I didn't immediately find the thread where this was discussed, so if you
> send a link that might answer my question.

Here is the spot in the thread where I replied:

    http://www.postgresql.org/message-id/20140201011125.GG19957@momjian.us

--
  Bruce Momjian  <bruce@momjian.us>        http://momjian.us
  EnterpriseDB                             http://enterprisedb.com

  + Everyone has their own god. +