Martin Koch created SOLR-4036:
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             Summary: JSON response writer mangles type in some cases for 
ExternalFileFields
                 Key: SOLR-4036
                 URL: https://issues.apache.org/jira/browse/SOLR-4036
             Project: Solr
          Issue Type: Bug
          Components: Response Writers
    Affects Versions: 4.0
            Reporter: Martin Koch


When using an external file field (containing, say, reads), values in the field 
can be returned using &fl=field(reads), yielding something like:

{"response":{"numFound":...,"start":0,"maxScore":1.0,"docs":[{"field(reads)":0.0}]}}


In the response, the field can be renamed to, say, views like this: 
&fl=views:field(reads), yielding something like:

{"response":{"numFound":...,"start":0,"maxScore":1.0,"docs":[{"views":0.0}]}}

If, in this case, the field is renamed to reads: &fl=reads:field(reads), the 
result is now:

{"response":{"numFound":...,"start":0,"maxScore":1.0,"docs":[{"reads":[0.0]}]}}

(the 0.0 reads are now encapsulated in a list). 

The same problem does not occur in the XML response writer. 

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