fdc1449392
flat_mutation_reader_v2 was introduced in a pair of commits in 2021:e3309322c3"Clone flat_mutation_reader related classes into v2 variants"08b5773c12"Adapt flat_mutation_reader_v2 to the new version of the API" as a replacement for flat_mutation_reader, using range_tombstone_change instead of range_tombstone to represent represent range tombstones. See those commits for more information. The transition was incremental; the last use of the original flat_mutation_reader was removed in 2022 in commit026f8cc1e7"db: Use mutation_partition_v2 in mvcc" In turn, flat_mutation_reader was introduced in 2017 in commit748205ca75"Introduce flat_mutation_reader" To transition from a mutation_reader that nested rows within a partition in a separate stream, to a flat reader that streamed partitions and rows in the same stream. Here, we reclaim the original name and rename the awkward flat_mutation_reader_v2 to mutation_reader. Note that mutation_fragment_v2 remains since we still use the original for compatibilty, sometimes. Some notes about the transition: - files were also renamed. In one case (flat_mutation_reader_test.cc), the rename target already existed, so we rename to mutation_reader_another_test.cc. - a namespace 'mutation_reader' with two definitions existed (in mutation_reader_fwd.hh). Its contents was folded into the mutation_reader class. As a result, a few #includes had to be adjusted. Closes scylladb/scylladb#19356
77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
/*
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* Copyright (C) 2016-present ScyllaDB
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*
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* Modified by ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#include "readers/mutation_reader_fwd.hh"
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#include "readers/mutation_reader.hh"
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#include "db/system_keyspace.hh"
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#include "tracing/trace_state.hh"
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namespace replica {
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class database;
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}
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namespace db {
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namespace size_estimates {
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struct token_range {
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bytes start;
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bytes end;
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};
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class size_estimates_mutation_reader final : public mutation_reader::impl {
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replica::database& _db;
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db::system_keyspace& _sys_ks;
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const dht::partition_range* _prange;
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const query::partition_slice& _slice;
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using ks_range = std::vector<sstring>;
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std::optional<ks_range> _keyspaces;
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ks_range::const_iterator _current_partition;
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streamed_mutation::forwarding _fwd;
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mutation_reader_opt _partition_reader;
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public:
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size_estimates_mutation_reader(replica::database& db, db::system_keyspace& sys_ks, schema_ptr, reader_permit, const dht::partition_range&, const query::partition_slice&, streamed_mutation::forwarding);
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virtual future<> fill_buffer() override;
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virtual future<> next_partition() override;
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virtual future<> fast_forward_to(const dht::partition_range&) override;
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virtual future<> fast_forward_to(position_range) override;
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virtual future<> close() noexcept override;
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private:
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future<> get_next_partition();
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future<> close_partition_reader() noexcept;
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std::vector<db::system_keyspace::range_estimates>
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estimates_for_current_keyspace(std::vector<token_range> local_ranges) const;
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};
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struct virtual_reader {
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replica::database& db;
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db::system_keyspace& sys_ks;
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mutation_reader operator()(schema_ptr schema,
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reader_permit permit,
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const dht::partition_range& range,
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const query::partition_slice& slice,
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tracing::trace_state_ptr trace_state,
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streamed_mutation::forwarding fwd,
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mutation_reader::forwarding fwd_mr) {
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return make_mutation_reader<size_estimates_mutation_reader>(db, sys_ks, std::move(schema), std::move(permit), range, slice, fwd);
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}
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virtual_reader(replica::database& db_, db::system_keyspace& sys_ks_) noexcept : db(db_), sys_ks(sys_ks_) {}
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};
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future<std::vector<token_range>> test_get_local_ranges(replica::database& db, db::system_keyspace& sys_ks);
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} // namespace size_estimates
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} // namespace db
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