Bug 214196 [Automation][Compatibility]Exception occurs when preview a old crosstab with measure sorting
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/DataEngineImpl.java
logger.logp( Level.WARNING,
					DataEngineImpl.class.getName( ),
					"prepare",
					"DataEngine has been shutdown",
					e );
			throw e;
		}
		if ( logger.isLoggable( Level.FINE ) )
			logger.fine( "Start to prepare query: "
					+ LogUtil.toString( querySpec ) );
		IPreparedQuery result = PreparedQueryUtil.newInstance( this,
				querySpec,
				appContext );
		
		logger.fine( "Finished preparing query." );
		logger.exiting( DataEngineImpl.class.getName( ), "prepare" );
		return result;
	}
	
	/**
	 * Provides a hint to DtE that the consumer is done with the given 
	 * data source connection, and 
	 * that its resources can be safely released as appropriate.
	 * This tells DtE that there is no more ReportQuery
	 * on a data set that uses such data source connection.
	 * The data source identified by name, should be one referenced 
	 * in one or more of the previously prepared ReportQuery.  
	 * Otherwise, it would simply return with no-op.
	 * <br>
	 * In BIRT Release 1, this method will likely be called by FPE