I agree, it feels like a step backwards for the CQL protocol. T#
On Wed, Mar 5, 2014 at 8:10 PM, Edward Capriolo <edlinuxg...@gmail.com>wrote: > Somewhat of an aside. But wasn't issues with client serialization issues > one of the reasons to get away from thrift? It seems like asking client > language to decode complex objects recreates the problem only with 1 degree > more complexity. > > > On Wed, Mar 5, 2014 at 1:55 PM, Theo Hultberg <t...@iconara.net> wrote: > > > thanks! yeah, I meant user defined types, but thanks for the description > of > > general custom types too, it's good to know. > > > > T# > > > > > > On Tue, Mar 4, 2014 at 9:28 PM, Tyler Hobbs <ty...@datastax.com> wrote: > > > > > On Sat, Mar 1, 2014 at 5:01 AM, Theo Hultberg <t...@iconara.net> > wrote: > > > > > > > Mikhail, thanks, but I meant the reverse of that. Say the user > creates > > a > > > > prepared statement where one of the columns is a custom type, how do > > you > > > > serialize the arguments to the prepared statement? Do you accept > > anything > > > > and let C* complain, or do you make a best effort to shoehorn the > > object > > > > the user passed into something that looks like the custom type? > > > > > > > > > > Just to be clear, by "custom type", you still mean a user-defined type, > > > correct? > > > > > > At least in the python driver, it's treated the same as any other > > > (parametrized) type. For each Cassandra type (UTF8Type, Int32Type, > etc), > > > the driver will accept values of one or more types. If any of the > > subtypes > > > don't match this, the driver will raise an exception. > > > > > > If you're actually talking about custom types and not user-defined > types, > > > I'll explain what the python driver does. If the typestring (e.g. > > > org.apache.cassandra.db.marshal.MyType) isn't recognized, the driver > will > > > expect a binary string that it can pass directly to Cassandra for > values > > of > > > that type. If the user wants to add driver-level support for it (to > > enable > > > converting a python object to a binary string and vice-versa), they can > > > subclass cassandra.cqltypes.CassandraType and define a serialize() and > > > deserialize() method. The only condition is that the python classname > > must > > > match the typestring from cassandra, so for > > > org.apache.cassandra.db.marshal.MyType, the user will create a > > > MyType(CassandraType) class. > > > > > > -- > > > Tyler Hobbs > > > DataStax <http://datastax.com/> > > > > > >
