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Expand Macros in zk Path for FETCH PARTITION Execution

Official CH changelog text
Expand macros in the zk path when executing FETCH PARTITION. #18839 (fastio).
Expand macros in the ZooKeeper path when executing FETCH PARTITION command.

Why it matters

This feature enables users to use macros within ZooKeeper paths for the FETCH PARTITION operation, simplifying configuration and improving flexibility by allowing dynamic path generation instead of hardcoding paths.

How to use it

Simply include macros in the ZooKeeper path configuration when using the FETCH PARTITION command. The macros will be automatically expanded during execution without additional user intervention.

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