1 | #pragma once |
2 | |
3 | #include <TableFunctions/ITableFunction.h> |
4 | |
5 | |
6 | namespace 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 | */ |
16 | class TableFunctionRemote : public ITableFunction |
17 | { |
18 | public: |
19 | TableFunctionRemote(const std::string & name_, bool secure_ = false); |
20 | |
21 | std::string getName() const override { return name; } |
22 | |
23 | private: |
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 | |