solr group count

[fernando]

here is the product format i have

<doc>
    <str name="productname">ipad</str>
    <str name="sku">1524856</str>
    <str name="store">apple.com</str>
</doc> 
<doc>
    <str name="productname">ipad</str>
    <str name="sku">1524856</str>
    <str name="store">apple.com</str>
</doc> 
<doc>
    <str name="productname">ipad</str>
    <str name="sku">1524856</str>
    <str name="store">buy.com</str>
</doc> 
<doc>
    <str name="productname">ipad</str>
    <str name="sku">1524856</str>
    <str name="store">amazon.com</str>
</doc> 
<doc>
    <str name="productname">ipad</str>
    <str name="sku">1524856</str>
    <str name="store">amazon.com</str>
</doc> 
<doc>
    <str name="productname">ipad</str>
    <str name="sku">1524856</str>
    <str name="store">ebay.com</str>
</doc> 

i have to group it with sku so i write it as

http://**********/?q=ipad&wt=xml&group=true&group.field=upc&group.ngroups=true

and in my output is

<result name="doclist" numFound="6" start="0">
<doc>
    <str name="productname">ipad</str>
    <str name="sku">1524856</str>
    <str name="store">apple.com</str>
</doc> 

but i want to group with store name too. if more than one product in a store
with same sku it should take only one store

my o/p should be like this(numfound=4 instead of 6)

<result name="doclist" numFound="4" start="0">
<doc>
    <str name="productname">ipad</str>
    <str name="sku">1524856</str>
    <str name="store">apple.com</str>
</doc> 



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