Support compound identifiers for custom settings in ClickHouse.
Why it matters
This feature enables the use of compound identifiers for custom settings, improving integration between ClickHouse and external codebases. It addresses the need for more flexible and structured custom settings when interfacing with external systems, although it does not provide direct benefits within ClickHouse itself.How to use it
Users can define and use custom settings with compound identifiers in their integration code to better organize and manage configuration parameters when interacting with ClickHouse.