[dotNetRDF-Develop] Issue CORE-284 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>Refactor how GROUP BY, Aggregates and Project Expressions are applied</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>0.8.0 RC 1</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>Refactor</td>
  </tr>
  <tr>
    <td><b>Description:</b></td>
  </tr>
  <tr>
    <td colspan="2"><p>
	The current method of applying GROUP BY, Aggregates and Project Expressions works and passes the official tests but implementation wise is somewhat different from other implementations like ARQ. &nbsp;The code in question is quite convuluted and hard to read making it difficult to maintain or extend going forward.</p>
<p>
	This task is to refactor the code appropriately, this includes the following:</p>
<ul>
	<li>
		Move code for group calculation and GroupMultiset population fully into GroupBy</li>
	<li>
		Move code for aggregate calculation into GroupBy</li>
	<li>
		Properly handle the case of aggregates with no GROUP BY - create a GroupMultiset containing a single group</li>
	<li>
		Handle project expressions as Extend over the inner algebra</li>
	<li>
		Remove separate Project operator since it&#39;s actual intended function is already handled by Select</li>
</ul></td>
  </tr>
</table>
<p>
            More information on this issue can be found at
            <a href="http://www.dotnetrdf.org/tracker/Issues/IssueDetail.aspx?id=284" target="_blank">http://www.dotnetrdf.org/tracker/Issues/IssueDetail.aspx?id=284</a></p>
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