v.20.5Improvement

Better Exception Message for Columns Declaration Parsing Error

Better exception message when cannot parse columns declaration list. This closes #10403. #11537 (alexey-milovidov).
Improved exception messages for better readability and diagnostics when ClickHouse cannot parse columns declaration lists.

Why it matters

This feature enhances error reporting by providing clearer and more informative exception messages when there is a failure in parsing the columns declaration list. This helps users quickly identify syntax or formatting issues in their SQL queries, reducing debugging time and improving usability.

How to use it

No explicit user action is required to enable this feature; it is integrated into ClickHouse's error handling system. Users will automatically benefit from more descriptive exception messages when encountering parsing errors in columns declaration lists.