Removed Unnecessary Quoting for Single Column Partition Key in system.parts Table

Why it matters

This change improves the readability and consistency of partition key values in the system.parts system table by avoiding redundant quotation marks for single-column partition keys. It helps users more easily interpret partition information without confusion caused by extra quotes.

How to use it

No action is required from users. The change is applied automatically in the system table system.parts when the partition key has a single column.