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
|
#include <Common/OptimizedRegularExpression.h>
#include <Common/typeid_cast.h>
#include <Storages/StorageMerge.h>
#include <Storages/checkAndGetLiteralArgument.h>
#include <Parsers/ASTLiteral.h>
#include <Parsers/ASTFunction.h>
#include <TableFunctions/ITableFunction.h>
#include <Analyzer/FunctionNode.h>
#include <Analyzer/TableFunctionNode.h>
#include <Interpreters/evaluateConstantExpression.h>
#include <Interpreters/Context.h>
#include <Access/ContextAccess.h>
#include <TableFunctions/TableFunctionMerge.h>
#include <TableFunctions/TableFunctionFactory.h>
#include <TableFunctions/registerTableFunctions.h>
namespace DB
{
namespace ErrorCodes
{
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
extern const int BAD_ARGUMENTS;
}
namespace
{
[[noreturn]] void throwNoTablesMatchRegexp(const String & source_database_regexp, const String & source_table_regexp)
{
throw Exception(
ErrorCodes::BAD_ARGUMENTS,
"Error while executing table function merge. Either there is no database, which matches regular expression `{}`, or there are "
"no tables in database matches `{}`, which fit tables expression: {}",
source_database_regexp,
source_database_regexp,
source_table_regexp);
}
}
std::vector<size_t> TableFunctionMerge::skipAnalysisForArguments(const QueryTreeNodePtr & query_node_table_function, ContextPtr) const
{
auto & table_function_node = query_node_table_function->as<TableFunctionNode &>();
auto & table_function_arguments_nodes = table_function_node.getArguments().getNodes();
size_t table_function_arguments_size = table_function_arguments_nodes.size();
std::vector<size_t> result;
for (size_t i = 0; i < table_function_arguments_size; ++i)
{
auto * function_node = table_function_arguments_nodes[i]->as<FunctionNode>();
if (function_node && function_node->getFunctionName() == "REGEXP")
result.push_back(i);
}
return result;
}
void TableFunctionMerge::parseArguments(const ASTPtr & ast_function, ContextPtr context)
{
ASTs & args_func = ast_function->children;
if (args_func.size() != 1)
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
"Table function 'merge' requires exactly 2 arguments - name "
"of source database and regexp for table names.");
ASTs & args = args_func.at(0)->children;
if (args.size() != 2)
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH,
"Table function 'merge' requires exactly 2 arguments - name "
"of source database and regexp for table names.");
auto [is_regexp, database_ast] = StorageMerge::evaluateDatabaseName(args[0], context);
database_is_regexp = is_regexp;
if (!is_regexp)
args[0] = database_ast;
source_database_name_or_regexp = checkAndGetLiteralArgument<String>(database_ast, "database_name");
args[1] = evaluateConstantExpressionAsLiteral(args[1], context);
source_table_regexp = checkAndGetLiteralArgument<String>(args[1], "table_name_regexp");
}
const TableFunctionMerge::DBToTableSetMap & TableFunctionMerge::getSourceDatabasesAndTables(ContextPtr context) const
{
if (source_databases_and_tables)
return *source_databases_and_tables;
source_databases_and_tables.emplace();
/// database_name is not a regexp
if (!database_is_regexp)
{
auto source_tables = getMatchedTablesWithAccess(source_database_name_or_regexp, source_table_regexp, context);
if (source_tables.empty())
throwNoTablesMatchRegexp(source_database_name_or_regexp, source_table_regexp);
(*source_databases_and_tables)[source_database_name_or_regexp] = source_tables;
}
/// database_name is a regexp
else
{
OptimizedRegularExpression database_re(source_database_name_or_regexp);
auto databases = DatabaseCatalog::instance().getDatabases();
for (const auto & db : databases)
if (database_re.match(db.first))
(*source_databases_and_tables)[db.first] = getMatchedTablesWithAccess(db.first, source_table_regexp, context);
if (source_databases_and_tables->empty())
throwNoTablesMatchRegexp(source_database_name_or_regexp, source_table_regexp);
}
return *source_databases_and_tables;
}
ColumnsDescription TableFunctionMerge::getActualTableStructure(ContextPtr context, bool /*is_insert_query*/) const
{
for (const auto & db_with_tables : getSourceDatabasesAndTables(context))
{
for (const auto & table : db_with_tables.second)
{
auto storage = DatabaseCatalog::instance().tryGetTable(StorageID{db_with_tables.first, table}, context);
if (storage)
return ColumnsDescription{storage->getInMemoryMetadataPtr()->getColumns().getAllPhysical()};
}
}
throwNoTablesMatchRegexp(source_database_name_or_regexp, source_table_regexp);
}
StoragePtr TableFunctionMerge::executeImpl(const ASTPtr & /*ast_function*/, ContextPtr context, const std::string & table_name, ColumnsDescription /*cached_columns*/, bool is_insert_query) const
{
auto res = std::make_shared<StorageMerge>(
StorageID(getDatabaseName(), table_name),
getActualTableStructure(context, is_insert_query),
String{},
source_database_name_or_regexp,
database_is_regexp,
getSourceDatabasesAndTables(context),
context);
res->startup();
return res;
}
TableFunctionMerge::TableSet
TableFunctionMerge::getMatchedTablesWithAccess(const String & database_name, const String & table_regexp, const ContextPtr & context)
{
OptimizedRegularExpression table_re(table_regexp);
auto table_name_match = [&](const String & table_name) { return table_re.match(table_name); };
auto access = context->getAccess();
auto database = DatabaseCatalog::instance().getDatabase(database_name);
bool granted_show_on_all_tables = access->isGranted(AccessType::SHOW_TABLES, database_name);
bool granted_select_on_all_tables = access->isGranted(AccessType::SELECT, database_name);
TableSet tables;
for (auto it = database->getTablesIterator(context, table_name_match); it->isValid(); it->next())
{
if (!it->table())
continue;
bool granted_show = granted_show_on_all_tables || access->isGranted(AccessType::SHOW_TABLES, database_name, it->name());
if (!granted_show)
continue;
if (!granted_select_on_all_tables)
access->checkAccess(AccessType::SELECT, database_name, it->name());
tables.emplace(it->name());
}
return tables;
}
void registerTableFunctionMerge(TableFunctionFactory & factory)
{
factory.registerFunction<TableFunctionMerge>();
}
}
|
