Great write up.

>The recent efforts to move the JSON type to production-ready status will be highly applicable to our logging use case. This feature is currently being rearchitected, with the development of the Variant type providing the foundation for a more robust implementation. When ready, we expect this to replace our map with more strongly typed (i.e. not uniformly typed) metadata structures that are also possibly hierarchical.

Very happy to see ClickHouse dogfooding itself for storing logs - hope this will help to hasten the work on improving the the json type more suitable to dynamic documents.