Allow cluster commands without table name in issue #50808

Why it matters

This feature addresses the limitation where these functions required a table name, enabling more flexible and convenient queries across clusters or remote servers without needing to specify a table. It simplifies distributed query syntax and improves usability in multi-cluster environments.

How to use it

Users can now call cluster, clusterAllReplicas, remote, and remoteSecure functions without providing the table name argument in their queries. This allows writing statements like SELECT * FROM cluster('cluster_name', 'database') WHERE ... without table name, leveraging default or relevant context.