ADQL: MOD sign

[Dave Morris]

Hi Marco,

On 2016-07-12 14:16, Marco Molinaro wrote:
> 
> I still like to know whether we should put something about the
> sign preservation in the modulo in the ADQL-2.1 WD
> 

Yes, I think we should define this in the 2.1 specification.

Based on the results from Cosmopterix, we should limit the parameters to 
integer values.
https://github.com/ivoa/cosmopterix/wiki/MOD-for-negative-numbers

I like the text you put in the errata, so is this appropriate for the 
standard ?

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     The modulo operator returns the remainder, R, of the division of two 
integer values, M / N

         M % N = R

     where

         R has the same sign as M
         |R| is less than |N|
         M = (K * N) + R for a given integer K

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Cheers,
Dave


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Dave Morris
Software Developer
Wide Field Astronomy Unit
Institute for Astronomy
University of Edinburgh
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