ced4b6e4ff
This patch adds an utility function to rename an identifier occurring in a cql3 relation. This function will be used when renaming an identifier in a view's where clause. Signed-off-by: Duarte Nunes <duarte@scylladb.com>
239 lines
12 KiB
C++
239 lines
12 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 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 "cql3/relation.hh"
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#include "cql3/term.hh"
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#include "cql3/tuples.hh"
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#include "cql3/restrictions/multi_column_restriction.hh"
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namespace cql3 {
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/**
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* A relation using the tuple notation, which typically affects multiple columns.
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* Examples:
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* - SELECT ... WHERE (a, b, c) > (1, 'a', 10)
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* - SELECT ... WHERE (a, b, c) IN ((1, 2, 3), (4, 5, 6))
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* - SELECT ... WHERE (a, b) < ?
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* - SELECT ... WHERE (a, b) IN ?
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*/
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class multi_column_relation final : public relation {
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private:
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std::vector<shared_ptr<column_identifier::raw>> _entities;
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shared_ptr<term::multi_column_raw> _values_or_marker;
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std::vector<shared_ptr<term::multi_column_raw>> _in_values;
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shared_ptr<tuples::in_raw> _in_marker;
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multi_column_relation(std::vector<shared_ptr<column_identifier::raw>> entities,
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const operator_type& relation_type, shared_ptr<term::multi_column_raw> values_or_marker,
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std::vector<shared_ptr<term::multi_column_raw>> in_values, shared_ptr<tuples::in_raw> in_marker)
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: relation(relation_type)
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, _entities(std::move(entities))
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, _values_or_marker(std::move(values_or_marker))
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, _in_values(std::move(in_values))
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, _in_marker(std::move(in_marker))
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{ }
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public:
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/**
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* Creates a multi-column EQ, LT, LTE, GT, or GTE relation.
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* For example: "SELECT ... WHERE (a, b) > (0, 1)"
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* @param entities the columns on the LHS of the relation
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* @param relationType the relation operator
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* @param valuesOrMarker a Tuples.Literal instance or a Tuples.Raw marker
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* @return a new <code>MultiColumnRelation</code> instance
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*/
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static shared_ptr<multi_column_relation> create_non_in_relation(std::vector<shared_ptr<column_identifier::raw>> entities,
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const operator_type& relation_type, shared_ptr<term::multi_column_raw> values_or_marker) {
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assert(relation_type != operator_type::IN);
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return make_shared(multi_column_relation(std::move(entities), relation_type, std::move(values_or_marker), {}, {}));
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}
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/**
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* Creates a multi-column IN relation with a list of IN values or markers.
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* For example: "SELECT ... WHERE (a, b) IN ((0, 1), (2, 3))"
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* @param entities the columns on the LHS of the relation
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* @param inValues a list of Tuples.Literal instances or a Tuples.Raw markers
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* @return a new <code>MultiColumnRelation</code> instance
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*/
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static shared_ptr<multi_column_relation> create_in_relation(std::vector<shared_ptr<column_identifier::raw>> entities,
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std::vector<shared_ptr<tuples::literal>> in_values) {
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std::vector<shared_ptr<term::multi_column_raw>> values(in_values.size());
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std::copy(in_values.begin(), in_values.end(), values.begin());
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return make_shared(multi_column_relation(std::move(entities), operator_type::IN, {}, std::move(values), {}));
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}
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static shared_ptr<multi_column_relation> create_in_relation(std::vector<shared_ptr<column_identifier::raw>> entities,
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std::vector<shared_ptr<tuples::raw>> in_values) {
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std::vector<shared_ptr<term::multi_column_raw>> values(in_values.size());
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std::copy(in_values.begin(), in_values.end(), values.begin());
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return make_shared(multi_column_relation(std::move(entities), operator_type::IN, {}, std::move(values), {}));
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}
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/**
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* Creates a multi-column IN relation with a marker for the IN values.
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* For example: "SELECT ... WHERE (a, b) IN ?"
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* @param entities the columns on the LHS of the relation
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* @param inMarker a single IN marker
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* @return a new <code>MultiColumnRelation</code> instance
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*/
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static shared_ptr<multi_column_relation> create_single_marker_in_relation(std::vector<shared_ptr<column_identifier::raw>> entities,
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shared_ptr<tuples::in_raw> in_marker) {
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return make_shared(multi_column_relation(std::move(entities), operator_type::IN, {}, {}, std::move(in_marker)));
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}
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const std::vector<shared_ptr<column_identifier::raw>>& get_entities() const {
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return _entities;
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}
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private:
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/**
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* For non-IN relations, returns the Tuples.Literal or Tuples.Raw marker for a single tuple.
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* @return a Tuples.Literal for non-IN relations or Tuples.Raw marker for a single tuple.
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*/
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shared_ptr<term::multi_column_raw> get_value() {
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return _relation_type == operator_type::IN ? _in_marker : _values_or_marker;
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}
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public:
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virtual bool is_multi_column() const override { return true; }
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protected:
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virtual shared_ptr<restrictions::restriction> new_EQ_restriction(database& db, schema_ptr schema,
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shared_ptr<variable_specifications> bound_names) override {
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auto rs = receivers(db, schema);
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std::vector<::shared_ptr<column_specification>> col_specs(rs.size());
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std::transform(rs.begin(), rs.end(), col_specs.begin(), [] (auto cs) {
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return cs->column_specification;
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});
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auto t = to_term(col_specs, get_value(), db, schema->ks_name(), bound_names);
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return ::make_shared<restrictions::multi_column_restriction::EQ>(schema, rs, t);
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}
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virtual shared_ptr<restrictions::restriction> new_IN_restriction(database& db, schema_ptr schema,
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shared_ptr<variable_specifications> bound_names) override {
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auto rs = receivers(db, schema);
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std::vector<::shared_ptr<column_specification>> col_specs(rs.size());
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std::transform(rs.begin(), rs.end(), col_specs.begin(), [] (auto cs) {
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return cs->column_specification;
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});
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if (_in_marker) {
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auto t = to_term(col_specs, get_value(), db, schema->ks_name(), bound_names);
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auto as_abstract_marker = static_pointer_cast<abstract_marker>(t);
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return ::make_shared<restrictions::multi_column_restriction::IN_with_marker>(schema, rs, as_abstract_marker);
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} else {
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std::vector<::shared_ptr<term::raw>> raws(_in_values.size());
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std::copy(_in_values.begin(), _in_values.end(), raws.begin());
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auto ts = to_terms(col_specs, raws, db, schema->ks_name(), bound_names);
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return ::make_shared<restrictions::multi_column_restriction::IN_with_values>(schema, rs, ts);
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}
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}
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virtual shared_ptr<restrictions::restriction> new_slice_restriction(database& db, schema_ptr schema,
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shared_ptr<variable_specifications> bound_names,
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statements::bound bound, bool inclusive) override {
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auto rs = receivers(db, schema);
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std::vector<::shared_ptr<column_specification>> col_specs(rs.size());
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std::transform(rs.begin(), rs.end(), col_specs.begin(), [] (auto cs) {
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return cs->column_specification;
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});
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auto t = to_term(col_specs, get_value(), db, schema->ks_name(), bound_names);
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return ::make_shared<restrictions::multi_column_restriction::slice>(schema, rs, bound, inclusive, t);
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}
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virtual shared_ptr<restrictions::restriction> new_contains_restriction(database& db, schema_ptr schema,
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shared_ptr<variable_specifications> bound_names, bool is_key) override {
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throw exceptions::invalid_request_exception(sprint("%s cannot be used for Multi-column relations", get_operator()));
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}
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virtual ::shared_ptr<relation> maybe_rename_identifier(const column_identifier::raw& from, column_identifier::raw to) override {
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auto new_entities = boost::copy_range<decltype(_entities)>(_entities | boost::adaptors::transformed([&] (auto&& entity) {
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return *entity == from ? ::make_shared<column_identifier::raw>(to) : entity;
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}));
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return ::make_shared(multi_column_relation(std::move(new_entities), _relation_type, _values_or_marker, _in_values, _in_marker));
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}
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virtual shared_ptr<term> to_term(const std::vector<shared_ptr<column_specification>>& receivers,
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::shared_ptr<term::raw> raw, database& db, const sstring& keyspace,
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::shared_ptr<variable_specifications> bound_names) override {
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auto as_multi_column_raw = dynamic_pointer_cast<term::multi_column_raw>(raw);
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auto t = as_multi_column_raw->prepare(db, keyspace, receivers);
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t->collect_marker_specification(bound_names);
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return t;
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}
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std::vector<const column_definition*> receivers(database& db, schema_ptr schema) {
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using namespace statements::request_validations;
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int previous_position = -1;
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std::vector<const column_definition*> names;
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for (auto&& raw : get_entities()) {
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const auto& def = to_column_definition(schema, raw);
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check_true(def.is_clustering_key(), "Multi-column relations can only be applied to clustering columns but was applied to: %s", def.name_as_text());
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check_false(std::count(names.begin(), names.end(), &def), "Column \"%s\" appeared twice in a relation: %s", def.name_as_text(), to_string());
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// FIXME: the following restriction should be removed (CASSANDRA-8613)
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if (def.position() != unsigned(previous_position + 1)) {
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check_false(previous_position == -1, "Clustering columns may not be skipped in multi-column relations. "
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"They should appear in the PRIMARY KEY order. Got %s", to_string());
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throw exceptions::invalid_request_exception(sprint("Clustering columns must appear in the PRIMARY KEY order in multi-column relations: %s", to_string()));
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}
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names.emplace_back(&def);
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previous_position = def.position();
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}
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return names;
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}
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virtual sstring to_string() const override {
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sstring str = tuples::tuple_to_string(_entities);
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if (is_IN()) {
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str += " IN ";
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str += !_in_marker ? "?" : tuples::tuple_to_string(_in_values);
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return str;
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}
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str += sstring(" ") + _relation_type.to_string() + " ";
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str += _values_or_marker->to_string();
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return str;
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}
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};
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}
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