[MarkLogic Dev General] Faster alternative to fn:last()

[Micah Dubinko]

An efficient way is to use fn:subsequence instead of a predicate. -m

On Jun 22, 2012, at 2:00 PM, Damon Feldman wrote:

Danny,

Try subsequence($pageSessionLogs, count($pageSessionLogs), 1)

Anything in square brackets is evaluated once for each element of the sequence, so if you profile that you’ll see something like “postion()=last()” evaluated many times – it just looks like an array index due to a syntactic sugar.

Yours,
Damon

From: general-bounces at developer.marklogic.com<mailto:general-bounces at developer.marklogic.com> [mailto:general-bounces at developer.marklogic.com] On Behalf Of Danny Sinang
Sent: Friday, June 22, 2012 4:24 PM
To: general
Subject: [MarkLogic Dev General] Faster alternative to fn:last()

Hello,

I'm trying to get the first and last documents in a sequence. The code goes like this :

                         let $firstLog := $pageSessionLogs[1]
                         let $lastLog := $pageSessionLogs[fn:last()]

After doing some timings, it looks like the 2nd line always takes around 30 milliseconds. And since I'm doing this in a loop, the delays add up significantly.

Is there a faster way of getting the last sequence member ?

Regards,
Danny
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