Unable to Configure CLI with YAML Files

[xyu]

Howdy!

The current CLI docs indicates that it should be possible to configure clickhouse-client with YAML as well as XML:

Or the same config in a YAML format:

user: username
password: 'password'
secure: true
openSSL:
  client:
    caConfig: '/etc/ssl/cert.pem'

However this does not seem to work because the YAML parser transforms the config into XML before merging and it always appends a clickhouse root element:

ClickHouse/src/Common/Config/YAMLParser.cpp

Lines 164 to 166 in 0038f32

	Poco::AutoPtr<Poco::XML::Document> xml = new Document;
	Poco::AutoPtr<Poco::XML::Element> root_node = xml->createElement("clickhouse");
	xml->appendChild(root_node);

Which does not match the requisite config root element that the CLI configs normally use resulting in errors like:

Merging bypassed - configuration file '/etc/clickhouse-client/config.d/xyu.yaml' doesn't belong to configuration '/etc/clickhouse-client/config.xml' - merging root node name 'clickhouse' doesn't match 'config'

When starting up the CLI with trace logging (clickhouse-client --log-level trace).