Bug 122254 Not Like operator is missing in the Filter tab of Data Set window
data/org.eclipse.birt.data/src/org/eclipse/birt/data/engine/script/ScriptEvalUtil.java
{
				try
				{
					obArray[0] = DataTypeUtil.toBoolean( obj );
					expr4Exception = op1.exprText;
					obArray[1] = DataTypeUtil.toBoolean( obArray[1] );
				}
				catch ( BirtException e )
				{ 
					throw new DataException( ResourceConstants.CONVERT_TO_DATATYPE_ERROR,
							new Object[]{
									expr4Exception, Boolean.class
							} );
				}
			}
			
			return obArray;
		}
		
		/**
		 * @param ise
		 * @return
		 */
		private static IScriptExpression constructValidScriptExpression ( IScriptExpression ise)
		{
		    return ise!=null && ise.getText().trim().length() > 0 ? ise : new ScriptExpression("null");
		}		
	}
}