lbug 0.18.0

An in-process property graph database management system built for query speed and scalability
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237

#include "processor/operator/ddl/drop.h"

#include "catalog/catalog.h"
#include "catalog/catalog_entry/index_catalog_entry.h"
#include "catalog/catalog_entry/rel_group_catalog_entry.h"
#include "common/exception/binder.h"
#include "common/string_utils.h"
#include "main/client_context.h"
#include "main/database.h"
#include "main/database_manager.h"
#include "processor/execution_context.h"
#include "storage/buffer_manager/memory_manager.h"
#include "storage/storage_manager.h"
#include "storage/table/node_table.h"
#include "transaction/transaction.h"
#include <format>

using namespace lbug::catalog;
using namespace lbug::common;

namespace lbug {
namespace processor {

void Drop::executeInternal(ExecutionContext* context) {
    auto clientContext = context->clientContext;
    switch (dropInfo.dropType) {
    case DropType::SEQUENCE: {
        dropSequence(clientContext);
    } break;
    case DropType::TABLE: {
        dropTable(clientContext);
    } break;
    case DropType::MACRO: {
        dropMacro(clientContext);
    } break;
    case DropType::GRAPH: {
        dropGraph(clientContext);
    } break;
    case DropType::INDEX: {
        dropIndex(clientContext);
    } break;
    default:
        UNREACHABLE_CODE;
    }
}

void Drop::dropSequence(const main::ClientContext* context) {
    auto catalog = Catalog::Get(*context);
    auto transaction = transaction::Transaction::Get(*context);
    auto memoryManager = storage::MemoryManager::Get(*context);
    if (!catalog->containsSequence(transaction, dropInfo.name)) {
        auto message = std::format("Sequence {} does not exist.", dropInfo.name);
        switch (dropInfo.conflictAction) {
        case ConflictAction::ON_CONFLICT_DO_NOTHING: {
            appendMessage(message, memoryManager);
            return;
        }
        case ConflictAction::ON_CONFLICT_THROW: {
            throw BinderException(message);
        }
        default:
            UNREACHABLE_CODE;
        }
    }
    catalog->dropSequence(transaction, dropInfo.name);
    appendMessage(std::format("Sequence {} has been dropped.", dropInfo.name), memoryManager);
}

void Drop::dropTable(const main::ClientContext* context) {
    auto catalog = Catalog::Get(*context);
    auto transaction = transaction::Transaction::Get(*context);
    auto memoryManager = storage::MemoryManager::Get(*context);
    if (!catalog->containsTable(transaction, dropInfo.name, context->useInternalCatalogEntry())) {
        auto message = std::format("Table {} does not exist.", dropInfo.name);
        switch (dropInfo.conflictAction) {
        case ConflictAction::ON_CONFLICT_DO_NOTHING: {
            appendMessage(message, memoryManager);
            return;
        }
        case ConflictAction::ON_CONFLICT_THROW: {
            throw BinderException(message);
        }
        default:
            UNREACHABLE_CODE;
        }
    }
    auto entry = catalog->getTableCatalogEntry(transaction, dropInfo.name);
    switch (entry->getType()) {
    case CatalogEntryType::NODE_TABLE_ENTRY: {
        for (auto& indexEntry : catalog->getIndexEntries(transaction)) {
            if (indexEntry->getTableID() == entry->getTableID()) {
                if (StringUtils::caseInsensitiveEquals(indexEntry->getIndexType(), "HASH") ||
                    StringUtils::caseInsensitiveEquals(indexEntry->getIndexType(), "ART")) {
                    continue;
                }
                throw BinderException(
                    std::format("Cannot delete node table {} because it is referenced by index {}.",
                        entry->getName(), indexEntry->getIndexName()));
            }
        }
        for (auto& relEntry : catalog->getRelGroupEntries(transaction)) {
            if (relEntry->isParent(entry->getTableID())) {
                throw BinderException(std::format("Cannot delete node table {} because it is "
                                                  "referenced by relationship table {}.",
                    entry->getName(), relEntry->getName()));
            }
        }
    } break;
    case CatalogEntryType::REL_GROUP_ENTRY: {
        // Do nothing
    } break;
    default:
        UNREACHABLE_CODE;
    }
    catalog->dropTableEntryAndIndex(transaction, dropInfo.name);
    appendMessage(std::format("Table {} has been dropped.", dropInfo.name), memoryManager);
}

void Drop::dropMacro(const main::ClientContext* context) {
    auto catalog = Catalog::Get(*context);
    auto transaction = transaction::Transaction::Get(*context);
    auto memoryManager = storage::MemoryManager::Get(*context);
    handleMacroExistence(context);
    catalog->dropMacro(transaction, dropInfo.name);
    appendMessage(std::format("Macro {} has been dropped.", dropInfo.name), memoryManager);
}

void Drop::dropGraph(const main::ClientContext* context) {
    auto dbManager = main::DatabaseManager::Get(*context);
    auto memoryManager = storage::MemoryManager::Get(*context);

    if (StringUtils::caseInsensitiveEquals(dropInfo.name, "main")) {
        throw BinderException{"Cannot drop the main graph."};
    }

    if (!dbManager->hasGraph(dropInfo.name)) {
        auto message = std::format("Graph {} does not exist.", dropInfo.name);
        switch (dropInfo.conflictAction) {
        case ConflictAction::ON_CONFLICT_DO_NOTHING: {
            appendMessage(message, memoryManager);
            return;
        }
        case ConflictAction::ON_CONFLICT_THROW: {
            throw BinderException(message);
        }
        default:
            UNREACHABLE_CODE;
        }
    }

    if (dbManager->hasDefaultGraph() && StringUtils::getUpper(dbManager->getDefaultGraphName()) ==
                                            StringUtils::getUpper(dropInfo.name)) {
        dbManager->clearDefaultGraph();
    }

    dbManager->dropGraph(dropInfo.name, const_cast<main::ClientContext*>(context));
    appendMessage(std::format("Graph {} has been dropped.", dropInfo.name), memoryManager);
}

void Drop::dropIndex(const main::ClientContext* context) {
    auto catalog = Catalog::Get(*context);
    auto transaction = transaction::Transaction::Get(*context);
    auto memoryManager = storage::MemoryManager::Get(*context);
    if (!catalog->containsTable(transaction, dropInfo.name, context->useInternalCatalogEntry())) {
        auto message = std::format("Table {} does not exist.", dropInfo.name);
        switch (dropInfo.conflictAction) {
        case ConflictAction::ON_CONFLICT_DO_NOTHING: {
            appendMessage(message, memoryManager);
            return;
        }
        case ConflictAction::ON_CONFLICT_THROW: {
            throw BinderException(message);
        }
        default:
            UNREACHABLE_CODE;
        }
    }
    auto tableEntry = catalog->getTableCatalogEntry(transaction, dropInfo.name);
    if (tableEntry->getType() != CatalogEntryType::NODE_TABLE_ENTRY) {
        throw BinderException(
            std::format("Table {} is not a node table; cannot drop index.", dropInfo.name));
    }
    auto tableID = tableEntry->getTableID();
    auto storageManager = storage::StorageManager::Get(*context);
    auto* nodeTable = storageManager->getTable(tableID)->ptrCast<storage::NodeTable>();
    // An index may live in the catalog (user-created indexes), in storage only (the default
    // built-in PK hash index), or in both. Drop whichever are present.
    const auto inCatalog = catalog->containsIndex(transaction, tableID, dropInfo.indexName);
    const auto inStorage = nodeTable->getIndex(dropInfo.indexName).has_value();
    if (!inCatalog && !inStorage) {
        auto message =
            std::format("Index {} does not exist in table {}.", dropInfo.indexName, dropInfo.name);
        switch (dropInfo.conflictAction) {
        case ConflictAction::ON_CONFLICT_DO_NOTHING: {
            appendMessage(message, memoryManager);
            return;
        }
        case ConflictAction::ON_CONFLICT_THROW: {
            throw BinderException(message);
        }
        default:
            UNREACHABLE_CODE;
        }
    }
    if (inCatalog) {
        // Marks the IndexCatalogEntry deleted; the commit path emits the WAL drop record.
        catalog->dropIndex(transaction, tableID, dropInfo.indexName);
    }
    if (inStorage) {
        // Removes the in-memory index; its pages are reclaimed on the next checkpoint.
        nodeTable->dropIndex(dropInfo.indexName);
    }
    appendMessage(std::format("Index {} has been dropped.", dropInfo.indexName), memoryManager);
}

void Drop::handleMacroExistence(const main::ClientContext* context) {
    auto catalog = Catalog::Get(*context);
    auto transaction = transaction::Transaction::Get(*context);
    auto memoryManager = storage::MemoryManager::Get(*context);
    if (!catalog->containsMacro(transaction, dropInfo.name)) {
        auto message = std::format("Macro {} does not exist.", dropInfo.name);
        switch (dropInfo.conflictAction) {
        case ConflictAction::ON_CONFLICT_DO_NOTHING: {
            appendMessage(message, memoryManager);
            return;
        }
        case ConflictAction::ON_CONFLICT_THROW: {
            throw BinderException(message);
        }
        default:
            UNREACHABLE_CODE;
        }
    }
}

} // namespace processor
} // namespace lbug