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We already have tests for Query's ExclusiveStartKey option, but we only exercised it as a way for paging linearly through all the results. Now we add a test that confirms that ExclusiveStartKey can be used not just for paging through all the result - but also for jumping directly to the middle of a partition after any clustering key (existing or non- existing clustering key). The new test also for the first time verifies that ExclusiveStartKey with a specific format works (previous tests just copied LastEvaluatedKey to ExclusiveStartKey, so any opaque cookie could have worked). The test passes on both DynamoDB and Alternator so it did not find a new bug. But it's useful to have as a regression test, in case in the future we want to improve paging performance (see #6278) - and need to keep in mind that ExclusiveStartKey is not just for paging. Signed-off-by: Nadav Har'El <nyh@scylladb.com> Message-Id: <20210729114703.1609058-1-nyh@scylladb.com>