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36a657fc10
In the previous patch, we added a "view virtual" flag on columns. In this patch we add persistance to this flag: I.e., writing it to the on-disk schema table and reading it back on startup. But the implementation is not as simple as adding a flag: In the on-disk system tables, we have a "columns" table listing all the columns in the database and their types. Cqlsh's "DESCRIBE MATERIALIZED VIEW" works by reading this "columns" table, and listing all of the requested view's columns. Therefore, we cannot add "virtual columns" - which are columns not added by the user and not intended to be seen - to this list. We therefore need to create in this patch a separate list for virtual columns, in a new table "view_virtual_columns". This table is essentially identical to the existing "columns" table, just separate. We need to write each column to the appropriate table (columns with the view_virtual flag to "view_virtual_columns", columns without it to the old "columns"), read from both on startup, and remember to delete columns from both when a table is dropped. Signed-off-by: Nadav Har'El <nyh@scylladb.com>
135 lines
4.2 KiB
C++
135 lines
4.2 KiB
C++
/*
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* Copyright 2015 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 <vector>
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#include "mutation.hh"
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#include "schema.hh"
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#include "canonical_mutation.hh"
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// Commutative representation of table schema
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// Equality ignores tombstones.
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class schema_mutations {
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mutation _columnfamilies;
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mutation _columns;
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mutation_opt _view_virtual_columns;
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mutation_opt _indices;
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mutation_opt _dropped_columns;
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mutation_opt _scylla_tables;
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public:
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schema_mutations(mutation columnfamilies, mutation columns, mutation_opt view_virtual_columns, mutation_opt indices, mutation_opt dropped_columns,
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mutation_opt scylla_tables)
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: _columnfamilies(std::move(columnfamilies))
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, _columns(std::move(columns))
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, _view_virtual_columns(std::move(view_virtual_columns))
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, _indices(std::move(indices))
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, _dropped_columns(std::move(dropped_columns))
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, _scylla_tables(std::move(scylla_tables))
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{ }
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schema_mutations(canonical_mutation columnfamilies,
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canonical_mutation columns,
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bool is_view,
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stdx::optional<canonical_mutation> indices,
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stdx::optional<canonical_mutation> dropped_columns,
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stdx::optional<canonical_mutation> scylla_tables,
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stdx::optional<canonical_mutation> view_virtual_columns);
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schema_mutations(schema_mutations&&) = default;
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schema_mutations& operator=(schema_mutations&&) = default;
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schema_mutations(const schema_mutations&) = default;
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schema_mutations& operator=(const schema_mutations&) = default;
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void copy_to(std::vector<mutation>& dst) const;
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const mutation& columnfamilies_mutation() const {
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return _columnfamilies;
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}
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const mutation& columns_mutation() const {
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return _columns;
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}
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const mutation_opt& view_virtual_columns_mutation() const {
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return _view_virtual_columns;
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}
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const mutation_opt& scylla_tables() const {
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return _scylla_tables;
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}
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mutation_opt& scylla_tables() {
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return _scylla_tables;
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}
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const mutation_opt& indices_mutation() const {
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return _indices;
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}
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const mutation_opt& dropped_columns_mutation() const {
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return _dropped_columns;
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}
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canonical_mutation columnfamilies_canonical_mutation() const {
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return canonical_mutation(_columnfamilies);
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}
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canonical_mutation columns_canonical_mutation() const {
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return canonical_mutation(_columns);
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}
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stdx::optional<canonical_mutation> view_virtual_columns_canonical_mutation() const {
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if (_view_virtual_columns) {
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return canonical_mutation(*_view_virtual_columns);
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}
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return {};
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}
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stdx::optional<canonical_mutation> indices_canonical_mutation() const {
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if (_indices) {
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return canonical_mutation(*_indices);
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}
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return {};
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}
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stdx::optional<canonical_mutation> dropped_columns_canonical_mutation() const {
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if (_dropped_columns) {
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return canonical_mutation(*_dropped_columns);
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}
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return {};
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}
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stdx::optional<canonical_mutation> scylla_tables_canonical_mutation() const {
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if (_scylla_tables) {
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return canonical_mutation(*_scylla_tables);
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}
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return {};
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}
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bool is_view() const;
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table_schema_version digest() const;
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bool operator==(const schema_mutations&) const;
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bool operator!=(const schema_mutations&) const;
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// Returns true iff any mutations contain any live cells
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bool live() const;
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};
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