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"sstable_streamed_mutation::fast_forward_to() is changed to use promoted index (via index_reader) to optimize skipping in large partitions. In addition to that, sstable mutation_reader is changed to use the index to skip to the next partition. Performance impact was evaluated using newly added tests/perf/perf_fast_forward What's beyond this series: - Using index_reader for single-partition reads as well - Using index_reader for skipping across ranges in clustering restrictions" * tag 'tgrabiec/skip-within-partition-using-index-v2' of github.com:cloudius-systems/seastar-dev: (47 commits) tests: Add performance test for fast forwarding of sstable readers tests: Allow starting cql_test_env on pre-existing data config: Allow specifying source when setting value tests: sstable: Add test for fast forwarding within partition using index sstables: sstable_streamed_mutation: use index in fast_forward_to() sstables: Store parsed promoted index in index_entry sstables: Add trace-level logging for sstable consumption sstables: Define deletion_time earlier sstables: Make parsing throw exception on malformed promoted index tests: Add tests for ordering of position_in_partition relative to composites position_range: Introduce all_clustered_rows() factory method position_in_partition: Introduce for_key()/after_key() factory methods position_in_partition: Add factory methods for positions around all rows position_in_partition: Introduce for_range_start()/for_range_end() position_in_partition: Fix friendship declaration keys: Introduce is_empty() for prefixes position_in_partition: Make comparable with composites types: Enhance lexicographical comparators compound_compat: Accept marker value in serialize_value() compound_compat: Add trichotomic comparator ...