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The main goal of this patch is to add a reproducer for issue #7966, where partition-range scan with filtering that begins with a long string of non-matches aborts the query prematurely - but the same thing is fine with a single-partition scan. The test, test_filtering_with_few_matches, is marked as "xfail" because it still fails on Scylla. It passes on Cassandra. I put a lot of effort into making this reproducer *fast* - the dev-build test takes 0.4 seconds on my laptop. Earlier reproducers for the same problem took as much as 30 seconds, but 0.4 seconds turns this test into a viable regression test. We also add a test, test_filter_on_unset, reproduces issue #6295 (or the duplicate #8122), which was already solved so this test passes. Refs #6295 Refs #7966 Refs #8122 Signed-off-by: Nadav Har'El <nyh@scylladb.com> Message-Id: <20210301170451.1470824-1-nyh@scylladb.com>