Bug 136820 viewer supports render report in pdf format
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/ReportEngineService.java
result = dataTask.extract( );
			if ( result != null )
			{
				iData = result.nextResultIterator( );
				if ( iData != null && columnNames.length > 0 )
				{
					StringBuffer buf = new StringBuffer( );
					
					buf.append( columnNames[0] );
					for ( int i = 1; i < columnNames.length; i++ )
					{
						buf.append( ',' ); 
						buf.append( columnNames[i] );
					}
					buf.append( '\n' );
					outputStream.write( buf.toString( ).getBytes( ) );
					buf.delete( 0, buf.length( ) );
					
					while ( iData.next( ) )
					{
						String value = null;
						try
						{
							value = cvsConvertor( (String) DataTypeUtil
									.convert( iData.getValue( columnNames[0] ),
											DataType.STRING_TYPE ) );
						}
						catch ( Exception e )
						{
							value = null;