Bug 123036 Data in a reprot is doubly stored
We currently stored data twice. Once in the content stream, once by DtE. The instance stored by content stream should not be there.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/ResultIterator.java
do
			{
				for ( int i = 0; i < columnNames.length; i++ )
				{
					if ( groupKeyValuesEqual( odiResult,
							groupKeyValues,
							columnNames,
							i ) )
					{
						if ( i == columnNames.length - 1 )
							return true;
					}
					else
					{
						
						
						resultIterator.skipToEnd( i + 1 );
						break;
					}
				}
			} while ( odiResult.next( ) );
			return false;
		}
		/**
		 * @param groupKeyValues
		 * @param columnNames
		 * @param i
		 * @return
		 * @throws BirtException
		 */