Aggregate table use much more memory than base table

The issue shows memory usage screenshots comparing aggregate and base tables but lacks code pointers. Start by examining memory allocation in table aggregation logic, possibly in storage or query execution modules. Look for existing tests related to memory or aggregation to understand expected behavior. Determine what 'done' looks like by verifying reduced memory consumption in aggregate table operations.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.