Updated SYSTEM SYNC REPLICA Checking, Resolving Issues #45508 and #45648

Why it matters

This update resolves issues related to the SYSTEM SYNC REPLICA command, ensuring more reliable synchronization of replicas by fixing identified bugs and improving the accuracy of replica state checks. It enhances stability and consistency during replica synchronization.

How to use it

Users can continue using the SYSTEM SYNC REPLICA command as before. The improved checking mechanism is applied automatically as part of ClickHouse upgrades that include this fix.