Support for Unicode Whitespace in Queries

Why it matters

This feature addresses issues arising when users copy-paste queries from sources like Word documents or web pages that include Unicode whitespace characters, which previously caused query parsing errors. It improves usability and robustness by accepting a wider range of whitespace characters in queries.

How to use it

No special action is required from users. Queries containing Unicode whitespace characters can be executed directly as ClickHouse now supports parsing them transparently.