9823e75d16
In preparation of the relaxation of the grammar to return any expression, change the whereClause production to return an expression rather than terms. Note that the expression is still constrained to be a conjunction of relations, and our filtering code isn't prepared for more. Before the patch, if the WHERE clause was optional, the grammar would pass an empty vector of expressions (which is exactly correct). After the patch, it would pass a default-constructed expression. Now that happens to be an empty conjunction, which is exactly what's needed, but it is too accidental, so the patch changes optional WHERE clauses to explicitly generate an empty conjunction if the WHERE clause wasn't specified.
70 lines
2.2 KiB
C++
70 lines
2.2 KiB
C++
/*
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* Copyright (C) 2016-present ScyllaDB
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*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#pragma once
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#include "cql3/statements/schema_altering_statement.hh"
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#include "cql3/statements/cf_properties.hh"
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#include "cql3/cf_name.hh"
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#include "cql3/expr/expression.hh"
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#include <seastar/core/shared_ptr.hh>
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#include <utility>
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#include <vector>
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#include <optional>
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namespace cql3 {
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class query_processor;
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class relation;
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namespace selection {
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class raw_selector;
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} // namespace selection
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namespace statements {
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/** A <code>CREATE MATERIALIZED VIEW</code> parsed from a CQL query statement. */
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class create_view_statement : public schema_altering_statement {
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private:
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mutable cf_name _base_name;
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std::vector<::shared_ptr<selection::raw_selector>> _select_clause;
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expr::expression _where_clause;
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std::vector<::shared_ptr<cql3::column_identifier::raw>> _partition_keys;
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std::vector<::shared_ptr<cql3::column_identifier::raw>> _clustering_keys;
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cf_properties _properties;
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bool _if_not_exists;
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view_ptr prepare_view(data_dictionary::database db) const;
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public:
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create_view_statement(
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cf_name view_name,
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cf_name base_name,
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std::vector<::shared_ptr<selection::raw_selector>> select_clause,
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expr::expression where_clause,
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std::vector<::shared_ptr<cql3::column_identifier::raw>> partition_keys,
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std::vector<::shared_ptr<cql3::column_identifier::raw>> clustering_keys,
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bool if_not_exists);
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auto& properties() {
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return _properties;
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}
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// Functions we need to override to subclass schema_altering_statement
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virtual future<> check_access(query_processor& qp, const service::client_state& state) const override;
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virtual void validate(query_processor&, const service::client_state& state) const override;
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future<std::pair<::shared_ptr<cql_transport::event::schema_change>, std::vector<mutation>>> prepare_schema_mutations(query_processor& qp, api::timestamp_type) const override;
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virtual std::unique_ptr<prepared_statement> prepare(data_dictionary::database db, cql_stats& stats) override;
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// FIXME: continue here. See create_table_statement.hh and CreateViewStatement.java
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};
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}
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}
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