[core] Bug fix for Cassandra queries.
[core] Bug fix for Cassandra queries.

neurodata/ndstore,openconnectome/open-connectome,openconnectome/open-connectome,neurodata/ndstore,neurodata/ndstore,neurodata/ndstore,openconnectome/open-connectome,openconnectome/open-connectome,openconnectome/open-connectome,openconnectome/open-connectome