Allow nested custom disks in ClickHouse, extending support beyond the previously flat disk structure.
Why it matters
This feature enables users to define custom disks with nested directory structures, providing greater flexibility in storage organization and management. It solves the limitation where custom disks could only have a flat structure, allowing for more complex and hierarchical storage layouts.How to use it
Users can define nested custom disks in their ClickHouse configuration by specifying directory paths in a hierarchical manner within the custom disks settings. This allows organizing storage in nested folders rather than a single flat directory.