title: Unable to execute R code on U-SQL using R extensions
body: <p>I have been trying to execute R code on U-SQL using the R extensions mentioned in the documentation (<a href="https://docs.microsoft.com/en-us/azure/data-lake-analytics/data-lake-analytics-u-sql-r-extensions" rel="nofollow noreferrer">https://docs.microsoft.com/en-us/azure/data-lake-analytics/data-lake-analytics-u-sql-r-extensions</a>). </p>
  
  <p>When I try to execute the example scripts mentioned in the link above, it throws the error:</p>
  
  <pre><code>C# error CS1739: The best overload for 'Reducer' does not have a parameter named 'rReturnType'
  </code></pre>
  
  <p>And when I remove the <code>rReturnType</code> parameter I am unable to make sense of the output.</p>
  
  <p>Are there any other Extension.R parameters which will serve the same purpose?</p>