SOLR exact match results not matching - parsing

Question

Hi I have a text_exact fieldType (field is text_ex) that has KeywordTokenizerFactory for matching against exact queries. For example, searching for sale gives results that contain the term sale, specifically. When I run the query like this text_ex:sale, the number of results were found to be 28, where as when I run the same query using a switch-query parser (defined in request handler), I get the number of results as 18, even though the parsed query is same as text_ex:sale in the switch query fq. Can anyone help me debug this issue? I suppose there is some inconsistency in the the way the query is parsed for exact case being true or false. I am not sure.
Here is my schema definition:
<fieldType name="text_exact" class="solr.TextField" omitNorms="false">
<analyzer type="index" omitTermFreqAndPositions="false">
<charFilter class="solr.MappingCharFilterFactory" mapping="mapping-FoldToASCII.txt"/>
<tokenizer class="solr.KeywordTokenizerFactory"/>
<filter class="solr.LowerCaseFilterFactory" />
<filter class="solr.WordDelimiterGraphFilterFactory"
generateWordParts="1"
generateNumberParts="0"
catenateWords="0"
catenateNumbers="0"
catenateAll="1"
splitOnCaseChange="0"
splitOnNumerics="0"/>
</analyzer>
<analyzer type="query">
<charFilter class="solr.MappingCharFilterFactory" mapping="mapping-FoldToASCII.txt"/>
<tokenizer class="solr.KeywordTokenizerFactory"/>
<filter class="solr.LowerCaseFilterFactory" />
<filter class="solr.WordDelimiterGraphFilterFactory"
generateWordParts="0"
generateNumberParts="0"
catenateWords="0"
catenateNumbers="0"
catenateAll="1"
splitOnCaseChange="0"
splitOnNumerics="0"/>
</analyzer>
</fieldType>
And here is my solrconfig.xml details:
<requestHandler name="/select" class="solr.SearchHandler">
<!-- default values for query parameters can be specified, these
will be overridden by parameters in the request
-->
<lst name="defaults">
<str name="exact">false</str>
<str name="echoParams">explicit</str>
<int name="rows">10</int>
<str name="defType">edismax</str>
<str name="qf">
displayValue^20 description^5 connectorName_txt zenDescription_txt^5 zenBusinessOwner_txt^2
categoryName^8 reportOwner^2 reportDetailsNameColumn^5
</str>
<str name="pf2">
displayValue^20 description^5 connectorName_txt zenDescription_txt^5 zenBusinessOwner_txt^2
categoryName^8 reportOwner^2 reportDetailsNameColumn^5
</str>
<str name="pf3">
displayValue^20 description^5 connectorName_txt zenDescription_txt^5 zenBusinessOwner_txt^2
categoryName^8 reportOwner^2 reportDetailsNameColumn^5
</str>
<str name="tie">1</str>
<str name="mm">100%</str>
<int name="ps2">3</int>
<int name="ps3">9</int>
<int name="qs">0</int>
<str name="df">text</str>
<str name="q.alt">*:*</str>
<str name="sort">score desc, averageRating desc, lastOneWeekCount desc</str>
<str name="bq">
query({!boost b=20}approved:"yes")
</str>
</lst>
<lst name="appends">
<str name="fq">{!switch case.false=*:* case.true=text_ex:$${q} v=$exact}</str>
</lst>
</requestHandler>
And here is the parsed query when I did exact search using the request handler:
"filter_queries":["{!switch case.false=\"*:*\" case.true=\"text_ex:sale\" v=$exact}"],
"parsed_filter_queries":["text_ex:sale"]
And here is the parsed query when the query text_ex:sale is run:
"filter_queries": [
"{!switch case.false=\"*:*\" case.true=\"text_ex:text_ex:sale\" v=$exact}"
],
"parsed_filter_queries": [
"MatchAllDocsQuery(*:*)"
]
Also I have noticed that enclosing a query within double quotes is throwing a syntax error. Any suggestions on how to resolve this issue?. Thanks in advance.
Here is the error message:
"error": {
"msg": "org.apache.solr.search.SyntaxError: Expected identifier at pos 53 str='{!switch case.false=\"*:*\" case.true=\"text_ex:text_ex\":sale\"\" v=$exact}'",
"code": 400
}