As I've understood it, one feature of Cassandra is that it's supposedly 'schema free', that is (coming from a RDBS perspective) a table could contain several rows with varying columns.
In fact I never found the word 'table' used in the official documentation, instead Cassandra was supposed to use SuperColumns and ColumnFamilies: http://en.wikipedia.org/wiki/Column_family
But when reading up on CQL, the replacement language for SQL, creating these kinds of structures seems imposible, instead it closely mirrors a relation database structure that requires the creation and updating of tables and prohibiting on the fly attaching a new column to an row if it's not already defined in the table.
This is not at all what I need for my current project, as I need to store a lot of different information for each entity in the database (it's an experiment combining logic programming with probabilistic information and machine learning)
I only just begun reading up CQL, Am I missing something or is Cassandra perhaps not the right choice for my project?