NULLs in ClickHouse can hurt performance

This article discusses the performance implications of using NULL values in ClickHouse, especially for developers transitioning from relational databases like PostgreSQL. Unlike PostgreSQL, where NULLs can be managed effectively, ClickHouse, being a columnar database, faces performance degradation due to NULLs, emphasizing the need to rethink data modeling in ClickHouse to avoid unnecessary performance issues.