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
*/
	private IConditionalExpression transformConditionalExpression( IConditionalExpression ce )
	{
		String prefix = null;
		if ( ce.getOperator( ) == IConditionalExpression.OP_TOP_N )
		{
			prefix = "Total.isTopN";
		}
		if ( ce.getOperator( ) == IConditionalExpression.OP_TOP_PERCENT )
		{
			prefix = "Total.isTopPercent";
		}
		if ( ce.getOperator( ) == IConditionalExpression.OP_BOTTOM_N )
		{
			prefix = "Total.isBottomN";
		}
		if ( ce.getOperator( ) == IConditionalExpression.OP_BOTTOM_PERCENT )
		{
			prefix = "Total.isBottomPercent";
		}
		if( prefix != null )
		{
			ce = new ConditionalExpression( prefix+"("
					+ ce.getExpression( ).getText( ) + ","
					+ ce.getOperand1( ).getText( ) + ")",
					IConditionalExpression.OP_TRUE );
		}
		return ce;
	}