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94749b01eb
The main motivation for this patchset is to prepare for adding a async close() method to flat_mutation_reader. In order to close the reader before destroying it in all paths we need to make next_partition asynchronous so it can asynchronously close a current reader before destoring it, e.g. by reassignment of flat_mutation_reader_opt, as done in scanning_reader::next_partition. Test: unit(release, debug) * git@github.com:bhalevy/scylla.git futurize-next-partition-v1: flat_mutation_reader: return future from next_partition multishard_mutation_query: read_context: save_reader: destroy reader_meta from the calling shard mutation_reader: filtering_reader: fill_buffer: futurize inner loop flat_mutation_reader::impl: consumer_adapter: futurize handle_result flat_mutation_reader: consume_pausable/in_thread: futurize_invoke consumer flat_mutation_reader: FlatMutationReaderConsumer: support also async consumer flat_mutation_reader:impl: get rid of _consume_done member