[MarkLogic Dev General] xdmp:estimate() and fn:distinct-values()

David Lee David.Lee at marklogic.com
Sat Aug 4 03:28:54 PDT 2012

Untested Suggestion.
Put userId into a element range index then use   estimate (cts:values())

David Lee
Lead Engineer
MarkLogic Corporation
dlee at marklogic.com
Phone: +1 650-287-2531
Cell:  +1 812-630-7622

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From: general-bounces at developer.marklogic.com [mailto:general-bounces at developer.marklogic.com] On Behalf Of Danny Sinang
Sent: Friday, August 03, 2012 10:38 PM
To: general
Subject: [MarkLogic Dev General] xdmp:estimate() and fn:distinct-values()


The query below runs quite fast (i.e. below 1 second).

let $totalCount := xdmp:estimate(/user[reg/productId=$myBooks]/userId)
let $numUnexpired := xdmp:estimate(/user[reg[productId=$myBooks and (endDate = 0 or endDate >= $current-epoch-time)]]/userId)
return ($totalCount, $numUnexpired, xdmp:elapsed-time())

Problem is, what I really need is to get the number of distinct values of "userId".

Doing xdmp:estimate(fn:distinct-values()) results in in XDMP:UNSEARCHABLE error.

Using fn:count() instead of xdmp:estimate() works, but takes so long (i.e. 30 seconds).

Is there a workaround for this ?


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