how to sort composite columns by column key in cassandra?

Question

In columnfamily, composite column key is (integer, string). I have tried the following comparator_types: 1. CompositeType(IntegerType, AsciiType) 2. CompositeType(IntegerType, BytesType)

I am able to add rows to this columnfamily. But, when i query this columnfamily, columns are not sorted on composite key integer value.

How can i sort all the columns on column key integer? Is comparator_type fine? What's the best way to sort column keys on first part of composite key?

Answer 1

Sorry, the docs say you cannot sort all the columns on your first column key--the integer. First let's clarify terms for folks reading this: A composite column key is the Cassandra storage engine (Thrift/CLI) term for the compound primary key CQL term. http://www.datastax.com/dev/blog/cql3-for-cassandra-experts

The Cassandra 2.0 docs say, "ORDER BY clauses can select a single column only. That column has to be the second column in a compound PRIMARY KEY." http://www.datastax.com/documentation/cql/3.1/cql/cql_reference/select_r.html?scroll=reference_ds_d35_v2q_xj__querying-compound-primary-keys-and-sorting-results