When terms are removed from the query analysis, dismax creates an empty
required query
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Key: SOLR-3128
URL: https://issues.apache.org/jira/browse/SOLR-3128
Project: Solr
Issue Type: Bug
Components: Schema and Analysis, search
Affects Versions: 3.5
Reporter: Zac Smith
Consider the following situation:
A field type is setup with the following query analyzer:
<analyzer type="query">
<tokenizer class="solr.WhitespaceTokenizerFactory" />
<filter class="solr.ShingleFilterFactory" outputUnigrams="false"
maxShingleSize="2" />
</analyzer>
The text 'chicken stock' is used as a search term. The
WhitespaceTokenizerFactory will create two terms: 'chicken' and 'stock'. Then
the ShingleFilterFactory will join them back into a single term 'chicken stock'.
Now the resulting dismax query will be:
+() DisjunctionMaxQuery((ingredient_synonyms:chicken stock)~0.01)
Note the empty required query: +()
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