1#pragma once
2
3#include <TableFunctions/ITableFunction.h>
4
5
6namespace DB
7{
8
9/* remote ('address', db, table) - creates a temporary StorageDistributed.
10 * To get the table structure, a DESC TABLE request is made to the remote server.
11 * For example
12 * SELECT count() FROM remote('example01-01-1', merge, hits) - go to `example01-01-1`, in the merge database, the hits table.
13 * An expression that generates a set of shards and replicas can also be specified as the host name - see below.
14 * Also, there is a cluster version of the function: cluster('existing_cluster_name', 'db', 'table')
15 */
16class TableFunctionRemote : public ITableFunction
17{
18public:
19 TableFunctionRemote(const std::string & name_, bool secure_ = false);
20
21 std::string getName() const override { return name; }
22
23private:
24 StoragePtr executeImpl(const ASTPtr & ast_function, const Context & context, const std::string & table_name) const override;
25
26 std::string name;
27 bool is_cluster_function;
28 std::string help_message;
29 bool secure;
30};
31
32}
33