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From: Isaac Morland <[email protected]>
To: Corey Huinker <[email protected]>
Cc: [email protected]
Subject: Re: CAST(... ON DEFAULT) - WIP build on top of Error-Safe User Functions
Date: Tue, 28 Mar 2023 15:25:05 -0400
Message-ID: <CAMsGm5dpfm2PHL8XZvC-JSd+UPkgx3rpReUA=G=4+rUCH+Ntcw@mail.gmail.com> (raw)
In-Reply-To: <CADkLM=fv1JfY4Ufa-jcwwNbjQixNViskQ8jZu3Tz_p656i_4hQ@mail.gmail.com>
References: <CADkLM=fv1JfY4Ufa-jcwwNbjQixNViskQ8jZu3Tz_p656i_4hQ@mail.gmail.com>

On Mon, 19 Dec 2022 at 17:57, Corey Huinker <[email protected]> wrote:

>
> Attached is my work in progress to implement the changes to the CAST()
> function as proposed by Vik Fearing.
>
> CAST(expr AS typename NULL ON ERROR)
>     will use error-safe functions to do the cast of expr, and will return
> NULL if the cast fails.
>
> CAST(expr AS typename DEFAULT expr2 ON ERROR)
>     will use error-safe functions to do the cast of expr, and will return
> expr2 if the cast fails.
>

Is there any difference between NULL and DEFAULT NULL?

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