>The auxdata is intended as a cache, so it must depend only on the
>argument value, not on any other state.

I'm not following.  Where is the argument different in my example.  The
zeroth argument is always 'x'.  Are you saying the argument has to be the
same memory location as well as the same value?

Take another look at the example.



On Mon, Nov 27, 2017 at 1:15 AM, Clemens Ladisch <clem...@ladisch.de> wrote:

> petern wrote:
> > So, at the very least, the documentation at
> > https://sqlite.org/c3ref/get_auxdata.html is woefully incomplete
> because:
> >
> > 1. The identical function in a different column of the same SELECT has a
> > separate meta-data cache.
>
> This is an implementation detail of the current version.
>
> > 2. Functions with identical names and different arg count, yet sharing
> > common identical meta data argument at the specified argument index, use
> a
> > separate meta-data cache.
>
> This is an implementation detail of the current version.
>
> > Ideally, these problems should be fixed instead of simply being
> documented
> > away.  And, if they are fixed, SELECT columns can have an efficient,
> > thread-safe, and powerful new expressiveness for the idioms of running
> > sums, running products, running concatenations, synthetic id columns, and
> > so on.
>
> The auxdata is intended as a cache, so it must depend only on the
> argument value, not on any other state.
>
> If you want to do something different, store the data elsewhere.  And
> there is not much of a guarantee when or how often user-defined functions
> are called, so even with your desired changes to the auxdata mechanism,
> you would not get the desired result.
>
>
> Regards,
> Clemens
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