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31f4f062a2
DynamoDB protocol specifies that when getting items in a batch failed only partially, unprocessed keys can be returned so that the user can perform a retry. Alternator used to fail the whole request if any of the reads failed, but right now it instead produces the list of unprocessed keys and returns them to the user, as long as at least 1 read was successful. NOTE: tested manually by compiling Scylla with error injection, which fails every nth request. It's rather hard to figure out an automatic test case for this scenario. Fixes #9984