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
catch ( BirtException e )
				{
					throw new DataException( ResourceConstants.CONVERT_TO_DATATYPE_ERROR,
							new Object[]{
									expr4Exception, Double.class
							} );
				}
			}
			else if ( obj instanceof Date )
			{
				try
				{
					obArray[0] = DataTypeUtil.toDate( obj );
					expr4Exception = op1.exprText;
					obArray[1] = DataTypeUtil.toDate( obArray[1] );
					if ( obArray[2] != null )
					{
						expr4Exception = op2.exprText;
						obArray[2] = DataTypeUtil.toDate( obArray[2] );
					}
				}
				catch ( BirtException e )
				{
					throw new DataException( ResourceConstants.CONVERT_TO_DATATYPE_ERROR,
							new Object[]{
									expr4Exception, Date.class
							} );
				}
			}
			else if ( obj instanceof Boolean )