Setting Secure Flag in Named Collections for ClickHouse Dictionary

Why it matters

This feature enhances security by allowing users to mark named_collections dictionaries that pull data from ClickHouse tables as secure, thereby controlling access and usage as per security requirements. It addresses the need to restrict sensitive data exposure when using table-based dictionaries.

How to use it

When defining a named_collection for a dictionary with a ClickHouse table source, include the secure flag in the configuration to enable this security feature.