Bug 128359 The logic is not correctly when a filter is added to the table on the layout
Description: The logic is not correctly when a filter is added to the table on the layout Steps to reproduce: Let me give an example. 1. Creat a report, new a datasource and a dataset 2. We consume that the dataset has 10 records(DataResult_A) . We set a filter(Filter_A) in the dataset, and then the 6 records of the dataset(DataResult_B) are gained. 3. Drag the dataset to the layout, and set another filter(Filter_B) on the table. Actual result: The result of Filter_B is based on DataResult_A. Expect result: The result of Filter_B should be based on DataResult_B.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/impl/PreparedQuery.java
{
	    return appContext;	    
	}
	
	/**
	 * @param context
	 */
	protected void setAppContext( Map context )
	{
	    appContext = context;
	}
	
	/**
	 * @return the appropriate subclass of the Executor
	 */
	protected abstract Executor newExecutor();
	
	/**
	 * For a SubQuery, this returns the top-level data source query that
	 * contains the SubQuery. For other queries, "this" is returned
	 * 
	 * @return the main data source query
	 */
	abstract protected PreparedDataSourceQuery getDataSourceQuery();
	
	/**
	 * @throws DataException
	 */
	private void prepare( )	throws DataException
	{