9472da3220
This is a prerequiste for a following commit. We want to move towards using non-contiguous memory chunks to avoid making large allocations. This commit does NOT change the behavior of Scylla at all. The rows corresponding to the result of a DESCRIBE statement are represented by an instance of `result_set`. Before these changes, we encoded descriptions using `bytes` and then passed them into a `result_set` using its method `add_row`. What it does is turn the instances of `bytes` into instances of `managed_bytes` and append them at the end of its internal vector. In these changes, we do it on our own and use another overload of the method.
144 lines
5.4 KiB
C++
144 lines
5.4 KiB
C++
/*
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* Copyright (C) 2022-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/sstring.hh>
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#include "cql3/cql_statement.hh"
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#include "cql3/statements/raw/describe_statement.hh"
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/**
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* SERVER-SIDE DESCRIBE STATEMENT
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*
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* Classes below are responsible for executing describe statement.
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* - cluster_describe_statement - DESC CLUSTER
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* - schema_describe_statement - DESC [FULL] SCHEMA / DESC [ONLY] KEYSPACE
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* - listing_describe_statement - DESC KEYSPACES/TYPES/FUNCTIONS/AGGREGATES/TABLES
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* - element_describe_statement - DESC TYPE/FUNCTION/AGGREGATE/MATERIALIZED VIEW/INDEX/TABLE
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* - generic_describe_statements - DESC
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*
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* Keyspace element means: UDT, UDF, UDA, index, view or table
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*/
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namespace replica {
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class database;
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}
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namespace cql3 {
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class query_processor;
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namespace statements {
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using element_type = raw::describe_statement::element_type;
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class describe_statement : public cql_statement {
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protected:
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describe_statement();
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virtual std::vector<lw_shared_ptr<column_specification>> get_column_specifications() const = 0;
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virtual std::vector<lw_shared_ptr<column_specification>> get_column_specifications(replica::database& db, const service::client_state& client_state) const {
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return get_column_specifications();
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}
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virtual seastar::future<std::vector<std::vector<managed_bytes_opt>>> describe(cql3::query_processor& qp, const service::client_state& client_state) const = 0;
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public:
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virtual uint32_t get_bound_terms() const override;
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virtual bool depends_on(std::string_view ks_name, std::optional<std::string_view> cf_name) const override;
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virtual seastar::future<> check_access(query_processor& qp, const service::client_state& state) const override;
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virtual seastar::shared_ptr<const metadata> get_result_metadata() const override;
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virtual seastar::future<seastar::shared_ptr<cql_transport::messages::result_message>>
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execute(cql3::query_processor& qp, service::query_state& state, const query_options& options, std::optional<service::group0_guard> guard) const override;
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};
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class cluster_describe_statement : public describe_statement {
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private:
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bool should_add_range_ownership(replica::database& db, const service::client_state& client_state) const;
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future<managed_bytes_opt> range_ownership(const service::storage_proxy& proxy, const sstring& ks) const;
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protected:
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virtual std::vector<lw_shared_ptr<column_specification>> get_column_specifications() const override;
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virtual std::vector<lw_shared_ptr<column_specification>> get_column_specifications(replica::database& db, const service::client_state& client_state) const override;
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virtual seastar::future<std::vector<std::vector<managed_bytes_opt>>> describe(cql3::query_processor& qp, const service::client_state& client_state) const override;
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public:
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cluster_describe_statement();
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};
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class schema_describe_statement : public describe_statement {
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struct schema_desc {
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bool full_schema;
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bool with_hashed_passwords;
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};
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struct keyspace_desc {
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std::optional<sstring> keyspace;
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bool only_keyspace;
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};
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private:
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std::variant<schema_desc, keyspace_desc> _config;
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[[maybe_unused]] bool _with_internals;
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protected:
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virtual std::vector<lw_shared_ptr<column_specification>> get_column_specifications() const override;
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virtual seastar::future<std::vector<std::vector<managed_bytes_opt>>> describe(cql3::query_processor& qp, const service::client_state& client_state) const override;
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public:
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schema_describe_statement(bool full_schema, bool with_hashed_passwords, bool with_internals);
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schema_describe_statement(std::optional<sstring> keyspace, bool only, bool with_internals);
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};
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class listing_describe_statement : public describe_statement {
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private:
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element_type _element;
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[[maybe_unused]] bool _with_internals;
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protected:
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virtual std::vector<lw_shared_ptr<column_specification>> get_column_specifications() const override;
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virtual seastar::future<std::vector<std::vector<managed_bytes_opt>>> describe(cql3::query_processor& qp, const service::client_state& client_state) const override;
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public:
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listing_describe_statement(element_type element, bool with_internals);
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listing_describe_statement(const listing_describe_statement&) = default;
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};
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class element_describe_statement : public describe_statement {
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private:
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element_type _element;
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std::optional<sstring> _keyspace;
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sstring _name;
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[[maybe_unused]] bool _with_internals;
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protected:
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virtual std::vector<lw_shared_ptr<column_specification>> get_column_specifications() const override;
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virtual seastar::future<std::vector<std::vector<managed_bytes_opt>>> describe(cql3::query_processor& qp, const service::client_state& client_state) const override;
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public:
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element_describe_statement(element_type element, std::optional<sstring> keyspace, sstring name, bool with_internals);
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};
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class generic_describe_statement : public describe_statement {
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private:
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std::optional<sstring> _keyspace;
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sstring _name;
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[[maybe_unused]] bool _with_internals;
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protected:
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virtual std::vector<lw_shared_ptr<column_specification>> get_column_specifications() const override;
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virtual seastar::future<std::vector<std::vector<managed_bytes_opt>>> describe(cql3::query_processor& qp, const service::client_state& client_state) const override;
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public:
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generic_describe_statement(std::optional<sstring> keyspace, sstring name, bool with_internals);
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};
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}
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}
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