If I rename the function then both the builtin avg and my new function work 

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>-----Original Message-----
>From: sqlite-users [mailto:sqlite-users-
>boun...@mailinglists.sqlite.org] On Behalf Of Simon Slavin
>Sent: Monday, 2 July, 2018 04:27
>To: SQLite mailing list
>Subject: Re: [sqlite] Window Function Crash -- overriding builtin
>On 2 Jul 2018, at 7:40am, Keith Medcalf <kmedc...@dessus.com> wrote:
>> Even if I register the override function using the new
>sqlite_create_window_function and explicitly set the xValue and
>xInverse to 0 (null), the program still crashes when attempting to
>run the non-existent xValue function ...
>As a test, and not a final resolution of your problem, what happens
>if you register your function with a new name, rather than using
>'AVG' ?  Does it work or do you still get mystery calls to xValue ?
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