Re: Implicit casts with generic arrays

Joe Conway <mail@joeconway.com> writes:
> Tom Lane wrote:
>> Maybe I am missing something, but the only such construct I see in
>> SQL2003 is concatenation of arrays of equal rank.  There is nothing
>> corresponding to array_prepend or array_append.

> Well, I've never claimed to be particularly good at interpreting the SQL 
> spec, but as an example...

> <array concatenation> ::=
>     <array value expression 1> || <array primary>
> <array primary> ::=
> <value expression primary> ::=
> <nonparenthesized value expression primary> ::=
> <unsigned value specification> ::=
> <unsigned literal> ::=
>      <unsigned numeric literal>

> Doesn't this mean that array concatenation should include things like:
>     <array value expression> || <unsigned numeric literal>

No, because the first syntax rule for that is

         1) The declared type of <value expression primary> shall be an
            array type.

However, assuming that the anynonarray idea works out, we can do that
and not worry about touching the array operators.

			regards, tom lane