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]
};
cheers
Arve
Am 25.09.13 07:22 schrieb Arto Viitanen:
Question was about set operations in BaseX. I
Any chance of getting, in addition to the per-file progress, the overall
progress of creating the database?
...currently no, because we’re not counting all files before
retrieving them (this can take quite a while when e.g. a network
resource is addressed, or if a ZIP file from a remote URL is
-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
Dear Yoann,
I tried to reproduce your example, using the following query:
$session = new Session(localhost, 1984, admin, admin);
$xml = $session-execute(XQUERY xy//x);
print $xml;
$session-execute(XQUERY insert node $xml into xml/);
$session-close();
This one runs without problems on my
I'm having similar issues where everything freezes on an http request done
from inside a restxq function, but only if certain conditions are present.
The conditions are not easy to pinpoint. However, they affect our ability
to validate content against modular dtds/xsds, to apply modular .xsl and
I found that it is locking up because of the database global
lockhttp://docs.basex.org/wiki/Options#GLOBALLOCK which
locks during any updating function. On the long updating call that was
happening first, it was grabbing the lock and so every subsequent request
was being blocked until the update
Hej Arto,
One can even improve your map2 by using the [Simple map operator].
declare function local:difference-map-2-excl($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
Hi,
Nice work. I wonder if the BaseX query optimizer could not spot the
idioms for the set operations and rewrite the query to something
similar for the cases:
distinct-values(($arg1, $arg2))
distinct-values($arg1[.=$arg2])
distinct-values($arg1[not(.=$arg2)])
From :
I had a typo in my example. The return did not call the map2 version. With it,
the results were (now on 7.7 and Windows 7)
- pred 58278.25 ms
- map 272.68 ms
- map2 74.27 ms
- map2! 92.97 ms
- flowr 43018.3 ms
Hej Arto,
One can even improve your map2 by using the [Simple map operator].
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