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
"evaluateJSExpr",
				"evaluateJSExpr() scriptText=" + scriptText 
				+ ", source=" + source 
				+ ", lineNo=" + lineNo);
		
		Object result;
		try
		{
			result = JavascriptEvalUtil.evaluateScript( cx, scope, scriptText, source, lineNo );
		}
		catch (BirtException e)
		{
			throw DataException.wrap(e);
		}
		
		
		if ( result instanceof DataExceptionMocker )
		{
			throw DataException.wrap( ((DataExceptionMocker) result ).getCause( ));
		}
		
		return result;
	}
	
	
	/**
	 * Wrap the text and value of the operand
	 * 
	 */
	public static class ExprTextAndValue