Does Cassandra CQL provide a command to generate an execution plan? In Oracle and other DBs you can generate an execution plan for SQL.

Is this possible for Cassandra?

I want to determine if it is possible to measure the relative complexity of several CQL statements to retrieve query data.

A Google search did not indicate that this is possible.
You can enable tracing of the CQL queries, and see how it's executed. In CQLSH it's done with command TRACING ON;, after you finish set TRACING OFF;.

This blog post provides more detailed description of it.