> If you have a method to retrieve the number of columns of a row (without > their values), I can't see why you couldn't retrieve the column names > (without their values). It's perharps harder than I think... But it would be > rather useful !
Internally this just gets the full columns and counts them. The main reason I was dismissive was the complication it brings when dealing with a Column. If a Column has no value would it be because there is no value associated with it or because only the column name was requested? For now when you have a Column you have all the information about the column. There may also be some modelling arguments to be made. it's not been a show stopper for people in the past, but that does not mean it's a bad idea. Cheers ----------------- Aaron Morton Freelance Cassandra Developer @aaronmorton http://www.thelastpickle.com On 8 Jun 2011, at 10:30, Patrick de Torcy wrote: > But I want values in my columns... Imagine a cf with authors as keys. Each > author has written several books. So each row has columns with the title as > column names and the text of the book as value (ie a lot of data). If a user > wants to know the different books for an author, I'd like to be able to have > the column names without the values, then a user can pick a book name. In > this case I can retrieve the value from this column (and only for this one). > Of course, I could have an additionnal column which will manage the column > names (=titles), but it's not very efficient and could be source of errors... > If you have a method to retrieve the number of columns of a row (without > their values), I can't see why you couldn't retrieve the column names > (without their values). It's perharps harder than I think... But it would be > rather useful ! > > Thanks ! > > On Mon, Jun 6, 2011 at 2:08 AM, aaron morton <aa...@thelastpickle.com> wrote: > You can create columns without values. > > Are you talking about reading them back through the API ? > > I would suggest looking at your data model to see if there is a better way to > support your read patterns. > > Cheers > > ----------------- > Aaron Morton > Freelance Cassandra Developer > @aaronmorton > http://www.thelastpickle.com > > On 6 Jun 2011, at 10:18, Patrick de Torcy wrote: > >> It would be definetely useful to be able to have columns (or super columns) >> names WITHOUT their values. If these ones are pretty big or if there are a >> lot of columns, that would generate traffic not necessarily needed (if in >> the end you are just interrested by some column). >> Moreover it doesn't seem to be a feature too difficult to implement (well, I >> think...) >> >> Patrick > >
