[dotNetRDF-Develop] Issue CORE-336 has been added to a project you are monitoring.

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<p>The following issue has been added to a project that you are monitoring.</p>
<table border="0">
  <tr>
    <td width="90px" valign="top"><b>Title:</b></td>
    <td>VALUES and GROUP BY may interact incorrectly</td>
  </tr>
  <tr>
    <td><b>Project:</b></td>
    <td>Core Library (dotNetRDF.dll)</td>
  </tr>
  <tr>
    <td><b>Created By:</b></td>
    <td>Rob Vesse</td>
  </tr>
  <tr>
    <td><b>Milestone:</b></td>
    <td>1.0.0</td>
  </tr>
  <tr>
    <td><b>Category:</b></td>
    <td>Query</td>
  </tr>
  <tr>
    <td><b>Priority:</b></td>
    <td>High</td>
  </tr>
  <tr>
    <td><b>Type:</b></td>
    <td>Bug</td>
  </tr>
  <tr>
    <td><b>Description:</b></td>
  </tr>
  <tr>
    <td colspan="2"><p>
	In checking some SPARQ corner cases I noticed the following bug, the first query works fine:</p>
<p>
	&nbsp;</p>
<p>
	&nbsp;</p>
<div>
	SELECT ?a</div>
<div>
	WHERE</div>
<div>
	{</div>
<div>
	&nbsp; VALUES ( ?a)</div>
<div>
	&nbsp; {</div>
<div>
	&nbsp; &nbsp; ( 1 )</div>
<div>
	&nbsp; &nbsp; ( 2 )</div>
<div>
	&nbsp; }</div>
<div>
	}</div>
<div>
	&nbsp;</div>
<div>
	However adding a GROUP BY causes it to return no results:</div>
<div>
	&nbsp;</div>
<div>
	<div>
		SELECT ?a</div>
	<div>
		WHERE</div>
	<div>
		{</div>
	<div>
		&nbsp; VALUES ( ?a)</div>
	<div>
		&nbsp; {</div>
	<div>
		&nbsp; &nbsp; ( 1 )</div>
	<div>
		&nbsp; &nbsp; ( 2 )</div>
	<div>
		&nbsp; }</div>
	<div>
		} GROUP BY ?a</div>
	<div>
		&nbsp;</div>
	<div>
		This is likely a bug in the implementation of the VALUES clause</div>
</div>
<p>
	&nbsp;</p></td>
  </tr>
</table>
<p>
            More information on this issue can be found at
            <a href="http://www.dotnetrdf.org/tracker/Issues/IssueDetail.aspx?id=336" target="_blank">http://www.dotnetrdf.org/tracker/Issues/IssueDetail.aspx?id=336</a></p>
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        </p>