Re: Why is cast array integer[] <--> text[] is not immutable.

From: Phil Couling <couling(at)gmail(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: Why is cast array integer[] <--> text[] is not immutable.
Date: 2011-12-09 16:23:44
Message-ID: CANWftzLLVJM=A55t8xZ6EpQucgfBGM4VrK-_WDYy0b77oMmfiA@mail.gmail.com
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Thanks

I'm having trouble finding any reference to array_out and array_in in
the documentation.

Is there a way to set a different cast for an array?

Regards

On 9 December 2011 15:09, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Phil Couling <couling(at)gmail(dot)com> writes:
>> I'm struggling to understand why this casts is not immutable:
>
>> integer[]::text[]
>> text[]::integer[]
>
> Because it's implemented via array_out/array_in rather than any more
> direct method, and those are marked stable because they potentially
> invoke non-immutable element I/O functions.
>
>                        regards, tom lane

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