Re: SELECT CAST(123 AS char) -> 1

Stephan Szabo <sszabo(at)megazone(dot)bigpanda(dot)com> writes:
> On Tue, 12 Feb 2008, Tom Lane wrote:
>> Also, section 6.10 <cast specification> defines an explicit cast to
>> a fixed-length string type as truncating or padding to the target
>> length (LTD):

> Are you sure that's the correct section to be using? Isn't that 6.10
> General Rules 5c which is if the source type is a fixed or variable
> length character string? Wouldn't the correct place for an int->char
> conversion be 5a or am I misreading it?

Hm, good point, so really we ought to have a separate casting path for
numeric types to char(n). However, this section still doesn't offer
any support for the OP's desire to auto-size the result; it says
that you get an error if the result doesn't fit in the declared
length:

> iv) Otherwise, an exception condition is raised: data exception-
> string data, right truncation.

regards, tom lane