Support ClickHouse

[tlightsky]

Is your feature request related to a problem? Please describe.
Support ClickHouse

Describe the solution you'd like
add driver:
import _ "github.com/kshvakov/clickhouse"

[hungry1526]

@tlightsky Thanks for submitting new feature question. Could you please give more details on what kind of application are you building with ClickHouse? Like web analytics with streaming events?

[tlightsky]

@hungry1526 we want do app events analytics with Clickhouse

[wangkuiyi]

Thank you @tlightsky for the suggestion. I looked into Yandex Clickhouse and the database driver you mentioned; they are promising.

Our current priority list includes Hive and MaxCompute, as you can see from the two subprojects https://github.com/sql-machine-learning/gohive and https://github.com/sql-machine-learning/gomaxcompute. The requirements come from contributors of SQLFlow. We would like to append Clickhouse to the priority list. Your contributions are welcome to accelerate the progress.