Bug 124610 Add a filter on a boolean computed column will cause error.
Description: Add a filter on a boolean computed column will cause error. Steps to reproduce: 1. New a BIRT sample data source and a dataset from table "orders" 2. Create a computed column with name="yes/no", type = any(no boolean for choose), value= if(row[1]%2==0){ true; }else{ false; } 3. Drag the dataset from Data Explorer to Layout 4. Select the table, click Filters tab in Property Editor. 5. Click Add button. 6. Select yes/no as Expression, Is True as Operator. 7. Save and preview. Expected result: Filter works. Actual result: Error0 : data.engine.ConvertToDataTypeError ( 1 time(s) ) detail : org.eclipse.birt.data.engine.core.DataException: can not be converted to class java.lang.Boolean.
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/script/ScriptEvalUtil.java
{
			if ( MiscUtil.isSameType( obj1, obj2 ) )
			{
				if ( obj1 instanceof Boolean )
				{
					if ( obj1.equals( obj2 ) )
						return 0;
					
					Boolean bool = (Boolean) obj1;
					if ( bool.equals( Boolean.TRUE ) )
						return 1;
					else
						return -1;
				}
				else if ( obj1 instanceof Comparable )
				{
					return ( (Comparable) obj1 ).compareTo( obj2 );
				}
				
				else
				{
					return obj1.toString( ).compareTo( obj2.toString( ) );
				}
			}
			else if ( MiscUtil.isNumericOrString( obj1 ) && MiscUtil.isNumericOrString( obj2 ) )
			{
				return DataTypeUtil.toDouble( obj1 ).compareTo(
						DataTypeUtil.toDouble( obj2 ) );
			}
			else if ( MiscUtil.isDateOrString( obj1 ) && MiscUtil.isDateOrString( obj2 ) )