Support for MongoDB Replica Set URI with readPreference and host:port enum in MongoDB dictionaries

[artem-yadr]

Changelog category (leave one):

• Improvement

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

• Support for connection to a replica set via a URI with a host:port enum and support for the readPreference option in MongoDB dictionaries. Example URI: mongodb://db0.example.com:27017,db1.example.com:27017,db2.example.com:27017/?replicaSet=myRepl&readPreference=primary

[kssenii]

Please fix CI checks. See fast test failed with "Cannot build ClickHouse". You can see details in details button, press run.log there.
You will find why build fails:

base/poco/MongoDB/CMakeFiles/_poco_mongodb.dir/src/Connection.cpp.o -c /ClickHouse/base/poco/MongoDB/src/Connection.cpp
2023-02-20 15:30:47 /ClickHouse/base/poco/MongoDB/src/Connection.cpp:240:19: error: declaration shadows a local variable [-Werror,-Wshadow]
2023-02-20 15:30:47         Poco::URI theURI(newURI);
2023-02-20 15:30:47                   ^
2023-02-20 15:30:47 /ClickHouse/base/poco/MongoDB/src/Connection.cpp:198:15: note: previous declaration is here
2023-02-20 15:30:47     Poco::URI theURI(newURI);
2023-02-20 15:30:47 

[kssenii]

/ClickHouse/base/poco/MongoDB/src/Connection.cpp
2023-02-27 17:33:54 In file included from ../../ClickHouse/base/poco/MongoDB/src/Connection.cpp:16:
2023-02-27 17:33:54 /ClickHouse/base/poco/MongoDB/include/Poco/MongoDB/Connection.h:165:36: error: return type of out-of-line definition of 'Poco::MongoDB::Connection::uri' differs from that in the declaration
2023-02-27 17:33:54     inline std::string Connection::uri() const
2023-02-27 17:33:54            ~~~~~~~~~~~             ^
2023-02-27 17:33:54 /ClickHouse/base/poco/MongoDB/include/Poco/MongoDB/Connection.h:94:29: note: previous declaration is here
2023-02-27 17:33:54         const std::string & uri() const;
2023-02-27 17:33:54       

[kssenii]

2023-02-28 21:40:20 /ClickHouse/src/Dictionaries/MongoDBDictionarySource.cpp:121:38: error: no member named 'uri' in 'std::shared_ptr<Poco::MongoDB::Connection>'; did you mean to use '->' instead of '.'?
2023-02-28 21:40:20         Poco::URI poco_uri(connection.uri());
2023-02-28 21:40:20                                      ^
2023-02-28 21:40:20                                      ->
2023-02-28 21:40:20 1 error generated.