"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
...
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