ClickHouse dictionary source

Example of settings:

SOURCE(CLICKHOUSE(
    host 'example01-01-1'
    port 9000
    user 'default'
    password ''
    db 'default'
    table 'ids'
    where 'id=10'
    secure 1
    query 'SELECT id, value_1, value_2 FROM default.ids'
));

<source>
    <clickhouse>
        <host>example01-01-1</host>
        <port>9000</port>
        <user>default</user>
        <password></password>
        <db>default</db>
        <table>ids</table>
        <where>id=10</where>
        <secure>1</secure>
        <query>SELECT id, value_1, value_2 FROM default.ids</query>
    </clickhouse>
</source>

Setting fields:

Setting	Description
`host`	The ClickHouse host. If it is a local host, the query is processed without any network activity. To improve fault tolerance, you can create a Distributed table and enter it in subsequent configurations.
`port`	The port on the ClickHouse server.
`user`	Name of the ClickHouse user.
`password`	Password of the ClickHouse user.
`db`	Name of the database.
`table`	Name of the table.
`where`	The selection criteria. Optional.
`invalidate_query`	Query for checking the dictionary status. Optional. Read more in the section Refreshing dictionary data using LIFETIME.
`secure`	Use SSL for connection.
`query`	The custom query. Optional.