Add support for multiple addresses same as in golang client

[kobi-co]

Hi,
It would be great if you'll be able to support multiple addresses same as in the golang client library for better support on working with clickhouse clusters.

Thank you!

[slvrtrn]

@kobi-co, it should be similar to https://github.com/ClickHouse/clickhouse-go#http-support-experimental, right?

http://host1:8123,host2:8123/database?dial_timeout=200ms&max_execution_time=60

[kobi-co]

I actually meant the option to pass multiple addresses in the Open method, but if we can get the same result by passing one address with multiple hosts that's good as well.

Thanks!

[zibellon]

Plus 1

Hello

I have clickhouse cluster - 4 servers (4 shards, no replicas). Now, this client can connect only to one instance (For example - shard 2). IF shard 2 DOWN - nothing work ...

1. pass multiple: { host, port, username, password, dbName }[]. AS ARRAY
2. switching connection and other INSIDE lib