TextField case sensitivity

[Xuesong Luo]

I run a problem when searching on a TextField. When I pass q=William or
q=WILLiam, solr is able to find records whose default search field value
is William, however if I pass q=WilliAm, solr did not return any thing.
I searched on the archive, Yonik mentioned the lowercasefilterfactory
doesn't work for wildcard because the QueryParser does not invoke
analysis for partial word, that makes sense. But in my case, it's a
whole word. Anyone knows why it's not working? Below is my schema info.

Thanks
Xuesong

<fieldtype name="text" class="solr.TextField"
positionIncrementGap="100">
      <analyzer type="index">
        <tokenizer class="solr.WhitespaceTokenizerFactory"/>        
        <filter class="solr.LowerCaseFilterFactory"/>
      </analyzer>
      <analyzer type="query">
        <tokenizer class="solr.WhitespaceTokenizerFactory"/>
        <filter class="solr.LowerCaseFilterFactory"/>
      </analyzer>
</fieldtype>