f3eade2f62
Drop the AGPL license in favor of a source-available license. See the blog post [1] for details. [1] https://www.scylladb.com/2024/12/18/why-were-moving-to-a-source-available-license/
61 lines
1.7 KiB
C++
61 lines
1.7 KiB
C++
/*
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* Copyright (C) 2019-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.0
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*/
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#pragma once
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#include <seastar/core/shared_ptr.hh>
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#include "utils/UUID.hh"
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#include "utils/UUID_gen.hh"
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using column_count_type = uint32_t;
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// Column ID, unique within column_kind
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using column_id = column_count_type;
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class schema;
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class schema_extension;
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using schema_ptr = seastar::lw_shared_ptr<const schema>;
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using table_id = utils::tagged_uuid<struct table_id_tag>;
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struct table_info {
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sstring name;
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table_id id;
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};
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namespace std {
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std::ostream& operator<<(std::ostream& os, const table_info& ti);
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} // namespace std
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template <>
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struct fmt::formatter<table_info> : fmt::formatter<string_view> {
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auto format(const table_info&, fmt::format_context& ctx) const -> decltype(ctx.out());
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};
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// Cluster-wide identifier of schema version of particular table.
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//
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// The version changes the value not only on structural changes but also
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// temporal. For example, schemas with the same set of columns but created at
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// different times should have different versions. This allows nodes to detect
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// if the version they see was already synchronized with or not even if it has
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// the same structure as the past versions.
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//
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// Schema changes merged in any order should result in the same final version.
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//
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// When table_schema_version changes, schema_tables::calculate_schema_digest() should
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// also change when schema mutations are applied.
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using table_schema_version = utils::tagged_uuid<struct table_schema_version_tag>;
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inline table_schema_version reversed(table_schema_version v) noexcept {
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return table_schema_version(utils::UUID_gen::negate(v.uuid()));
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}
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