Solr group.order not work

[alexzhang]

I use the Solr 4.0.0 +, when I try to sort the results which within one
group, it does not work? 

The wiki I referenced: http://wiki.apache.org/solr/FieldCollapsing

The xml return like:

......
    <lst name="grouped">
        <lst name="title">
            <int name="matches">2</int>
            <arr name="groups">
                <lst>
                    <str name="groupValue">AEST</str>
                    <result name="doclist" numFound="2" start="0">
                        <doc>
                            <str
name="id">7d37cd01-b6e0-4ef7-86b6-5a073efc46e5</str>
                            <str name="title">AEST</str>
                            <bool name="isActive">true</bool>
                            <str name="eISBN" />
                            <str name="filePath">file_01.xhtml</str>
                            <str name="fileContent">aa bb cc dd ee</str>
                            <int name="tocSequence">2</int>
                            <long
name="_version_">1435147561336832000</long>
                        </doc>
                        <doc>
                            <str
name="id">b1d90fa8-3832-465a-ae6f-dc82955b8c30</str>
                            <str name="title">AEST</str>
                            <bool name="isActive">true</bool>
                            <str name="eISBN" />
                            <str name="filePath">file_02.xhtml</str>
                            <str name="fileContent">aa bb cc dd ee</str>
                            <int name="tocSequence">1</int>
                            <long
name="_version_">1435147570241339392</long>
                        </doc>
                    </result>
                </lst>
            </arr>
        </lst>
    </lst>
......

The above result will NOT change whether I set the group.order=tocSequence
or not.

Anyone met this before?



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