David Smiley created SOLR-10404:
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             Summary: The "fetch" streaming expression should escape join 
values in generated query
                 Key: SOLR-10404
                 URL: https://issues.apache.org/jira/browse/SOLR-10404
             Project: Solr
          Issue Type: Bug
      Security Level: Public (Default Security Level. Issues are Public)
    Affects Versions: 6.5
            Reporter: David Smiley


The "fetch" streaming expression joins data from another collection.  Example:
{{expr=fetch(collection,search(...), on="fieldA=fieldB"}}
  Internally, it does this by building a Solr query that looks like  
{{fieldB:(value1 value2 value3)}}.  *But those values are not escaped*; they 
should be.  See FetchStream.java line 233.  The ramification is that, for 
example, if a value contains a colon, then this isn't going to work.



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