8307681975
It will be used to slice data returned by mutation_readers. Signed-off-by: Piotr Jastrzebski <piotr@scylladb.com>
76 lines
2.9 KiB
C++
76 lines
2.9 KiB
C++
/*
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* Copyright (C) 2016 ScyllaDB
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*
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* Modified by 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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#pragma once
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#include <functional>
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#include <vector>
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#include "core/shared_ptr.hh"
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#include "database_fwd.hh"
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#include "schema.hh"
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template<typename T> class range;
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namespace query {
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class partition_slice;
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// A predicate that tells if a clustering key should be accepted.
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using clustering_key_filter = std::function<bool(const clustering_key&)>;
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// A factory for clustering key filter which can be reused for multiple clustering keys.
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class clustering_key_filter_factory {
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public:
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// Create a clustering key filter that can be used for multiple clustering keys with no restrictions.
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virtual clustering_key_filter get_filter(const partition_key&) = 0;
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// Create a clustering key filter that can be used for multiple clustering keys but they have to be sorted.
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virtual clustering_key_filter get_filter_for_sorted(const partition_key&) = 0;
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virtual const std::vector<range<clustering_key_prefix>>& get_ranges(const partition_key&) = 0;
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virtual ~clustering_key_filter_factory() = default;
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};
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class clustering_key_filtering_context {
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private:
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shared_ptr<clustering_key_filter_factory> _factory;
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clustering_key_filtering_context() {};
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clustering_key_filtering_context(shared_ptr<clustering_key_filter_factory> factory) : _factory(factory) {}
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public:
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// Create a clustering key filter that can be used for multiple clustering keys with no restrictions.
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clustering_key_filter get_filter(const partition_key& key) const {
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return _factory ? _factory->get_filter(key) : [] (const clustering_key&) { return true; };
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}
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// Create a clustering key filter that can be used for multiple clustering keys but they have to be sorted.
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clustering_key_filter get_filter_for_sorted(const partition_key& key) const {
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return _factory ? _factory->get_filter_for_sorted(key) : [] (const clustering_key&) { return true; };
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}
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const std::vector<range<clustering_key_prefix>>& get_ranges(const partition_key& key) const;
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static const clustering_key_filtering_context create(schema_ptr, const partition_slice&);
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static clustering_key_filtering_context create_no_filtering();
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};
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extern const clustering_key_filtering_context no_clustering_key_filtering;
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}
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