v.21.4Improvements

Added Case Insensitive Aliases for CONNECTION_ID() and VERSION() Functions

Added case insensitive aliases for CONNECTION_ID() and VERSION() functions. This fixes #22028. #22042 (Eugene Klimov).
Added case insensitive aliases for the CONNECTION_ID() and VERSION() functions in ClickHouse.

Why it matters

This feature addresses the issue where using different case variations of CONNECTION_ID() and VERSION() functions caused errors or inconsistencies. By supporting case insensitive aliases, it improves user experience and compatibility with queries written with different letter cases.

How to use it

Users can now call CONNECTION_ID() and VERSION() functions using any case variation (e.g., connection_id(), Version(), etc.) without any additional configuration.