blob: 8cc5119978a9ef786ed06fb768511edd216cb613 (
plain) (
blame)
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
|
#pragma once
#include <TableFunctions/ITableFunction.h>
namespace DB
{
/* merge (db_name, tables_regexp) - creates a temporary StorageMerge.
* The structure of the table is taken from the first table that came up, suitable for regexp.
* If there is no such table, an exception is thrown.
*/
class TableFunctionMerge : public ITableFunction
{
public:
static constexpr auto name = "merge";
std::string getName() const override { return name; }
private:
StoragePtr executeImpl(const ASTPtr & ast_function, ContextPtr context, const std::string & table_name, ColumnsDescription cached_columns, bool is_insert_query) const override;
const char * getStorageTypeName() const override { return "Merge"; }
using TableSet = std::set<String>;
using DBToTableSetMap = std::map<String, TableSet>;
const DBToTableSetMap & getSourceDatabasesAndTables(ContextPtr context) const;
ColumnsDescription getActualTableStructure(ContextPtr context, bool is_insert_query) const override;
std::vector<size_t> skipAnalysisForArguments(const QueryTreeNodePtr & query_node_table_function, ContextPtr context) const override;
void parseArguments(const ASTPtr & ast_function, ContextPtr context) override;
static TableSet getMatchedTablesWithAccess(const String & database_name, const String & table_regexp, const ContextPtr & context);
String source_database_name_or_regexp;
String source_table_regexp;
bool database_is_regexp = false;
mutable std::optional<DBToTableSetMap> source_databases_and_tables;
};
}
|
