Github user ajs6f commented on a diff in the pull request:

    https://github.com/apache/jena/pull/320#discussion_r153824555
  
    --- Diff: 
jena-text/src/main/java/org/apache/jena/query/text/TextQueryPF.java ---
    @@ -295,6 +295,14 @@ private String chooseGraphURI(ExecutionContext 
execCxt) {
             return results;
         }
         
    +    private boolean noLang(String lang) {
    +        return (lang == null || lang.isEmpty() || " ".equals(lang));
    --- End diff --
    
    I don't know much about the text indexing, but this single space-- does 
that have some special meaning, or is it just a simple check for whitespace? 
I.e., could we see more than one space char here?


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