Re: Aw: Which is less expensive group by or select di

I need a formated and sorted string


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-------- Original message --------
From: "Martin Honnen martin.honnen@xxxxxx"
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: 7/15/16  12:28 PM  (GMT-08:00)
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: Aw:  Which is less expensive group by or select
distinct-values

Well, using distinct-values is fine, but converting its result to a string
only to tokenize it back to a sequence is nonsense.

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15.07.2016, 21:19, "dvint@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
schrieb:


    So I have a large document that I need to pull a list of unique values

    from a given element. These are taxonomy and term tag values from a 4,000

    topic collection of DITA content.



    Without knowing how these are implemented, is there something I should be

    able to intuit just from the spec? This is some code that I inherited and

    it wouldn't have been how I would have attacked the problem:



    <xsl:variable name="TermList">

    <xsl:value-of select="distinct-values(.//term[not(@keyref)])"

    separator=", " />

    </xsl:variable>

    <data type="topicreport" name="WDTermList">

    <xsl:for-each select="tokenize(normalize-space($TermList), ', ')">

    <xsl:sort select="." />

    <xsl:value-of select="."/>

    <xsl:if test="position() != last()">, </xsl:if>

    </xsl:for-each>

    </data>



    If this hadn't existed in the stylesheet already, I would have probably

    done something like:



    <xsl:for-each-group select=".//term[not(@keyref)])" group-by=".">

    <xsl:sort select="current-grouping-key()" />

    <xsl:value-of select="current-grouping-key()"/>

    <xsl:if test="position() != last()">, </xsl:if>

    </xsl:for-each-group>



    Currently the process (with a bunch of other checks) runs for a very long

    time due to the size of the file I'm processing and the number of the

    checks. Recently after adding a couple of more checks it keeps requiring

    the java heap to be increased as it runs out of memory.



    I don't think the above is my major time synch in this process but it is

    one class of things that I'm reporting. I think the real processing time

    issue is coming from a lot of string analysis/parsing that is occurring.



    I'll probably run a physical test in a simple stylesheet with this
content

    to try and time any significant difference, but I was wondering what your

    thoughts would be.