ColumnStore Performance Improvements

This epic focuses on improving the core performance of MariaDB ColumnStore by targeting inefficiencies in query execution, memory usage, and data processing pipelines and more. It aims to deliver faster, more consistent query runtimes, especially for complex joins, UNION operations, and high-concurrency scenarios by addressing both CPU and memory bottlenecks, eliminating redundant processing, and smarter query plan decisions.

Key objectives include:
• Faster query execution
• Eliminate redundant processing or unnecessary overhead
• Improve performance of any subsystem involved
• Optimize column scanning and filtering
• Reduce memory footprint during query execution
• Enhance concurrency scalability by minimizing query contention

These improvements will help ColumnStore scale better with growing data volumes and concurrent workloads, while also delivering more predictable performance for BI and analytical queries.