v.21.2New Features

Adds system.distributed_ddl_queue table for DDL worker queue monitoring

Official CH changelog text
Adds a new table called system.distributed_ddl_queue that displays the queries in the DDL worker queue. #17656 (Bharat Nallan).
Adds a new table system.distributed_ddl_queue that shows the queries currently in the Distributed DDL worker queue.

Why it matters

This feature enables users to monitor and inspect the DDL queries waiting to be executed by the distributed DDL worker, improving transparency and troubleshooting for distributed schema changes.

How to use it

Query the new system table using SELECT * FROM system.distributed_ddl_queue to view the list of pending DDL queries in the queue.

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