Re: BUG #4509: array_cat's null behaviour is inconsistent

Added to TODO:

Improve handling of NULLs in arrays

* http://archives.postgresql.org/pgsql-bugs/2008-11/msg00009.php

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Kevin Field wrote:
>
> The following bug has been logged online:
>
> Bug reference: 4509
> Logged by: Kevin Field
> Email address: kev(at)brantaero(dot)com
> PostgreSQL version: 8.3.4
> Operating system: Windows Server 2003 SP2
> Description: array_cat's null behaviour is inconsistent
> Details:
>
> Section 9.2 in the docs say, 'The ordinary comparison operators yield null
> (signifying "unknown") when either input is null.' This applies to other
> operators too. For example, the result of tacking an unknown value onto a
> known one is unknown, because you don't know what exactly you just tacked
> on. So
>
> select null::text || 'hello';
>
> ...returns NULL, which makes sense. But then this
>
> select array_cat(null::integer[], '{3}'::integer[]);
>
> ...doesn't return NULL, which it should, for consistency.
>
> Kev
>
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