Hej Arto,
One can even improve your map2 by using the [Simple map operator].
declare function local:difference-map-2-excl($a, $b) {
let $m2 := map:new($b ! map:entry(., true()))
return $a ! (if($m2(.)) then () else .)
};
- map 299.47 ms
- map2 290.96 ms
- map2 + ! 128.25 ms
cheers
Arve
[Simple map operator] http://www.w3.org/TR/xquery-30/#id-map-operator
Am 25.09.13 10:41 schrieb Arto Viitanen:
>
>
> -----Original Message-----
> From: Arve Gengelbach [mailto:a...@basex.org]
> Sent: 25. syyskuuta 2013 9:08
> To: Arto Viitanen
> Cc: basex-talk@mailman.uni-konstanz.de
> Subject: Re: [basex-talk] Set Operator Examples
>
> Hej Arto,
>
> just being interested:
> How does it compare to a FLOWR expression?
>
> declare function local:difference-flowr($a, $b) {
> for $x in $a
> where not($x = $b)
> group by $x
> return $x[1]
> };
>
> pred 51787.06 ms
> map 485.16 ms
> map2 325.09 ms
> flowr 45275.97 ms
>
> --
> Arto Viitanen
> Finland
>
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