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Re: CAST(... ON DEFAULT) - WIP build on top of Error-Safe User Functions - Mailing list pgsql-hackers

From Isaac Morland
Subject Re: CAST(... ON DEFAULT) - WIP build on top of Error-Safe User Functions
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Msg-id CAMsGm5dpfm2PHL8XZvC-JSd+UPkgx3rpReUA=G=4+rUCH+Ntcw@mail.gmail.com
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In response to CAST(... ON DEFAULT) - WIP build on top of Error-Safe User Functions  (Corey Huinker <corey.huinker@gmail.com>)
Responses Re: CAST(... ON DEFAULT) - WIP build on top of Error-Safe User Functions
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On Mon, 19 Dec 2022 at 17:57, Corey Huinker <corey.huinker@gmail.com> 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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