Spring Data Cassandra and Map of Maps - Stack Overflow
OK, what @phact said is not the answer is was looking for, but it did set me on the path to figuring things out.
As per my own comment on my original post, it appeared that this was a datastax driver issue, not a spring-data-cassandra issue. And that was borne out when I wrote a small test harness to try and query the problem table w/just the datastax client. I picked v2.1.7.1 of cassandra-driver-core and was able to query the table w/the map of maps fine.
Looking at the version of the driver that v1.3.0 of spring-data-cassandra brings in it's older, v2.0.4. A bit of maven dependency malarkey and I had my spring-data-cassandra project using a newer datastax driver and everything works fine.
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