[dotNetRDF-Develop] Issue CORE-416 has a new comment

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<p>A new comment has been added to the following issue.</p>
<table border="0">
  <tr>
    <td width="90px" valign="top"><b>Title:</b></td>
    <td>Investigate performance problems reported involving sub-query and GRAPH clause interaction</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>2014-05-22 04:53 PM</td>
  </tr>
  <tr>
    <td><b>Comment:</b></td>
  </tr>
  <tr>
    <td colspan="2"><p>
	Turns out the fix for CORE-398 may have introduced a regression whereby generated algebra unecessarily nests the GRAPH clause multiple times leading to the query engine having to do excessive work. &nbsp;Fixing this is doable but likely to be tricky and may take some time</p></td>
  </tr>
</table>
<p>
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