Using the following statements to reproduce:
Native clients that set result_page_size in the query message receive multiple non-distinct rows back (one per clustered value p in row k).
This is only reproduced on 2.0.10. Does not appear in 2.1.0
It does not appear in cqlsh for 2.0.10 because thrift.
See https://datastax-oss.atlassian.net/browse/PYTHON-164 for background