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
*/
		private static boolean isFormatNeeded( Object obj, int operator,
				ExprTextAndValue op1, ExprTextAndValue op2 )
		{
			
			if ( operator == IConditionalExpression.OP_LIKE
					|| operator == IConditionalExpression.OP_TOP_N
					|| operator == IConditionalExpression.OP_TOP_PERCENT
					|| operator == IConditionalExpression.OP_BOTTOM_N
					|| operator == IConditionalExpression.OP_BOTTOM_PERCENT
					|| obj == null || op1.value == null )
				return false;
			
			else if ( ( operator == IConditionalExpression.OP_BETWEEN || operator == IConditionalExpression.OP_NOT_BETWEEN )
					&& op2.value == null )
				return false;
			
			return true;
		}
		
		/**
		 * To ease the methods compare and between. Exception with specific
		 * explanation will be thrown if anything goes wrong.
		 * 
		 * @param obj
		 * @param op1
		 * @param op2
		 * @return
		 * @throws DataException
		 */