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eba4191223
Prepare for marking deferred actions noexcept. Signed-off-by: Benny Halevy <bhalevy@scylladb.com>
114 lines
4.0 KiB
C++
114 lines
4.0 KiB
C++
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* Copyright (C) 2015-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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* 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 <seastar/core/shared_ptr.hh>
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#include "seastarx.hh"
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#include <optional>
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#include <vector>
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#include <stddef.h>
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class schema;
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namespace cql3 {
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class column_identifier;
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class column_specification;
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namespace functions { class function_call; }
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/**
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* Metadata class currently holding bind variables specifications and
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* `function_call` AST nodes inside a query partition key restrictions.
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* Populated and maintained at "prepare" step of query execution.
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*/
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class prepare_context final {
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private:
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std::vector<shared_ptr<column_identifier>> _variable_names;
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std::vector<lw_shared_ptr<column_specification>> _specs;
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std::vector<lw_shared_ptr<column_specification>> _target_columns;
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// A list of pointers to prepared `function_call` AST nodes, that
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// participate in partition key ranges computation within an LWT statement.
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using function_calls_t = std::vector<::shared_ptr<cql3::functions::function_call>>;
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function_calls_t _pk_fn_calls;
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// The flag denoting whether the context is currently in partition key
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// processing mode (inside query restrictions AST nodes). If set to true,
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// then every `function_call` instance will be recorded in the context and
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// will be assigned an identifier, which will then be used for caching
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// the function call results.
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bool _processing_pk_restrictions = false;
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public:
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prepare_context() = default;
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size_t bound_variables_size() const;
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const std::vector<lw_shared_ptr<column_specification>>& get_variable_specifications() const &;
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std::vector<lw_shared_ptr<column_specification>> get_variable_specifications() &&;
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std::vector<uint16_t> get_partition_key_bind_indexes(const schema& schema) const;
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void add_variable_specification(int32_t bind_index, lw_shared_ptr<column_specification> spec);
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void set_bound_variables(const std::vector<shared_ptr<column_identifier>>& prepare_meta);
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function_calls_t& pk_function_calls();
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// Record a new function call, which evaluates a partition key constraint.
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// Also automatically assigns an id to the AST node for caching purposes.
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void add_pk_function_call(::shared_ptr<cql3::functions::function_call> fn);
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// Inform the context object that it has started or ended processing the
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// partition key part of statement restrictions.
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void set_processing_pk_restrictions(bool flag) noexcept {
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_processing_pk_restrictions = flag;
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}
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bool is_processing_pk_restrictions() const noexcept {
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return _processing_pk_restrictions;
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}
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};
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}
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