[Jprogramming] Show cause hearing: maximum rank will be 63

[Roger Hui]

I repeat my question, what are the benefits of restricting array rank to be
≤ 63 ?



On Mon, Apr 5, 2021 at 8:28 PM Henry Rich <henryhrich at gmail.com> wrote:

> 'May be'.  Have you actually implemented it?
>
> I find it very hard to believe that a J sparse array would be the best
> choice for any database.  It seems to me to:
>
> * take lots of memory per value
> * have limited or inefficient queries
> * be very slow for updates, as the entire table must be copied
>
> Please prove me wrong.
>
> Henry Rich
>
> On 4/5/2021 10:04 PM, Igor Zhuravlov wrote:
> > On Sun, Apr 4, 2021, 11:52 PM Henry Rich <henryhrich at gmail.com> wrote:
> >> I propose that the maximum value for a rank, whether of a verb or a
> >> noun, will be 63.  Minimum verb rank will be _63.
> >>
> >> You got a problem with that?
> > A database in J may be implemented as a sparse boolean orthotope where
> each
> > axis corresponds to some attribute (field, column of relational table),
> and
> > value 1 ("true") marks tuple [1].
> >
> > A restriction proposed will limit a number of attributes to <64 for this
> > application. It would be sad but not fatal. I'd prefer to have this limit
> > larger, say, O(1e5).
> >
> > References:
> > [1] http://www.jsoftware.com/pipermail/general/2000-February/003102.html
> >      Jforum: Sparse Array as Database ?
> >      Roger Hui
> >      Thu Feb 10 19:06:50 HKT 2000
> >
>
>
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