Solr mm is field Level in case sow is false

[Aman Deep singh]

Hi,
When sow is set to false then solr query is generated a little differently as 
compared to sow=true

Solr version -6.6.1

User query -Asus ZenFone Go ZB5 Smartphone
mm is set to 100%
qf=nameSearch^7 brandSearch

field definition

1. nameSearch—
<fieldType name="text_word_delimiter" class="solr.TextField" 
autoGeneratePhraseQueries="false" positionIncrementGap="100">
    <analyzer type="index">
        <tokenizer class="solr.WhitespaceTokenizerFactory"/>
        <filter class="solr.PatternReplaceFilterFactory" pattern="&amp;" 
replacement="and"/>
        <filter class="solr.PatternReplaceFilterFactory" pattern="[^\dA-Za-z ]" 
replacement=" "/>
        <filter class="solr.WordDelimiterFilterFactory" catenateNumbers="1" 
generateNumberParts="1" splitOnCaseChange="1" generateWordParts="1" 
preserveOriginal="1" catenateAll="1" catenateWords="1"/>
        <filter class="solr.LowerCaseFilterFactory"/>
        <filter class="solr.RemoveDuplicatesTokenFilterFactory"/>
    </analyzer>
    <analyzer type="query">
        <tokenizer class="solr.StandardTokenizerFactory"/>
        <filter class="solr.PatternReplaceFilterFactory" pattern="&amp;" 
replacement="and"/>
        <filter class="solr.PatternReplaceFilterFactory" pattern="[^\dA-Za-z ]" 
replacement=" "/>
        <filter class=“solr.ManagedSynonymGraphFilterFactory" 
synonyms=“synonyms.txt"/>
        <filter class="solr.WordDelimiterFilterFactory" catenateNumbers="0" 
generateNumberParts="1" splitOnCaseChange="1" generateWordParts="1" 
splitOnNumerics="1" preserveOriginal="0" catenateAll="0" catenateWords="0"/>
        <filter class="solr.LowerCaseFilterFactory"/>
        <filter class="solr.RemoveDuplicatesTokenFilterFactory"/>
    </analyzer>
</fieldType>

2. brandSearch
<fieldType name="text_exact" class="solr.TextField" 
autoGeneratePhraseQueries="true" positionIncrementGap="100">
    <analyzer type="index">
        <tokenizer class="solr.StandardTokenizerFactory"/>
        <filter class="solr.LowerCaseFilterFactory"/>
    </analyzer>
    <analyzer type="query">
        <tokenizer class="solr.StandardTokenizerFactory"/>
        <filter class="solr.LowerCaseFilterFactory"/>
    </analyzer>
</fieldType>


with sow=false
"parsedquery":"(+DisjunctionMaxQuery((((brandSearch:asus brandSearch:zenfone 
brandSearch:go brandSearch:zb5 brandSearch:smartphone)~5) | ((nameSearch:asus 
nameSearch:zen nameSearch:fone nameSearch:go nameSearch:zb nameSearch:5 
nameSearch:smartphone)~7)^7.0)))/no_coord",
    
with sow=true
"parsedquery":"(+(DisjunctionMaxQuery((brandSearch:asus | 
(nameSearch:asus)^7.0)) DisjunctionMaxQuery((brandSearch:zenfone | 
((nameSearch:zen nameSearch:fone)~2)^7.0)) DisjunctionMaxQuery((brandSearch:go 
| (nameSearch:go)^7.0)) DisjunctionMaxQuery((brandSearch:zb5 | ((nameSearch:zb 
nameSearch:5)~2)^7.0)) DisjunctionMaxQuery((brandSearch:smartphone | 
(nameSearch:smartphone)^7.0)))~5)/no_coord",
    
    

If you see the difference in parsed query in sow=false case mm is working as 
field level while in case of sow=true mm is working across the field
    
We need to use sow=false as it is the only way to use multiword synonyms
Any idea why it is behaving in this manner and any way to fix so that mm will 
work across fields in qf.

Thanks,
Aman Deep Singh