[dotNetRDF-Develop] Issue CORE-398 has a new comment

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<p>A new comment has been added to the following issue.</p>
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  <tr>
    <td width="90px" valign="top"><b>Title:</b></td>
    <td>Unexpected SPARQL query result for MINUS inside UNION and specifying named graph</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>Date:</b></td>
    <td>2014-02-01 09:38 PM</td>
  </tr>
  <tr>
    <td><b>Comment:</b></td>
  </tr>
  <tr>
    <td colspan="2"><p>
	So it turns out getting to the airport early gives you more free time than you thought. &nbsp;This bug actually has nothing to do with MINUS its just the structure of the query happens to show a low level bug up and give the impression that MINUS is working incorrectly.</p>
<p>
	&nbsp;</p>
<p>
	The actual bug is in the compilation of queries into SPARQL algebra and for some types of leaf node it is incorrectly compiling modifiers on that node. &nbsp;So in the test case given here the left hand side of the UNION looks at the default graph which is empty instead of the named graph as the query asks.</p>
<p>
	&nbsp;</p>
<p>
	I have made the fix on a branch for the specific case highlighted here but I think there are a couple more cases where the issue might occur and need to review further to determine what those are and also verify interaction of the fix with other query elements before I merge this into trunk.</p></td>
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</table>
<p>
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