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502a45ad58
We define the native reverse format as a reversed mutation fragment stream that is identical to one that would be emitted by a table with the same schema but with reversed clustering order. The main difference to the current format is how range tombstones are handled: instead of looking at their start or end bound depending on the order, we always use them as-usual and the reversing reader swaps their bounds to facilitate this. This allows us to treat reversed streams completely transparently: just pass along them a reversed schema and all the reader, compacting and result building code is happily ignorant about the fact that it is a reversed stream.
70 lines
2.4 KiB
C++
70 lines
2.4 KiB
C++
/*
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* Copyright 2016-present ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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class cql_serialization_format final {
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uint8_t protocol_version();
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};
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namespace query {
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class specific_ranges {
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partition_key pk();
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std::vector<nonwrapping_range<clustering_key_prefix>> ranges();
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};
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// COMPATIBILITY NOTE: the partition-slice for reverse queries has two different
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// format:
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// * legacy format
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// * native format
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// The wire format uses the legacy format. See docs/design-notes/reverse-reads.md
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// for more details on the formats.
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class partition_slice {
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std::vector<nonwrapping_range<clustering_key_prefix>> default_row_ranges();
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utils::small_vector<uint32_t, 8> static_columns;
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utils::small_vector<uint32_t, 8> regular_columns;
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query::partition_slice::option_set options;
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std::unique_ptr<query::specific_ranges> get_specific_ranges();
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cql_serialization_format cql_format();
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uint32_t partition_row_limit_low_bits() [[version 1.3]] = std::numeric_limits<uint32_t>::max();
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uint32_t partition_row_limit_high_bits() [[version 4.3]] = 0;
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};
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struct max_result_size {
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uint64_t soft_limit;
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uint64_t hard_limit;
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}
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class read_command {
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utils::UUID cf_id;
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utils::UUID schema_version;
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query::partition_slice slice;
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uint32_t row_limit_low_bits;
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std::chrono::time_point<gc_clock, gc_clock::duration> timestamp;
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std::optional<tracing::trace_info> trace_info [[version 1.3]];
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uint32_t partition_limit [[version 1.3]] = std::numeric_limits<uint32_t>::max();
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utils::UUID query_uuid [[version 2.2]] = utils::UUID();
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query::is_first_page is_first_page [[version 2.2]] = query::is_first_page::no;
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std::optional<query::max_result_size> max_result_size [[version 4.3]] = std::nullopt;
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uint32_t row_limit_high_bits [[version 4.3]] = 0;
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};
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}
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