⚡ Bolt: Optimize NodeUtils.isParentOf using parent pointers #175
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Optimizes the `isParentOf` utility function by switching from a recursive top-down search (O(Subtree Size)) to a bottom-up traversal using parent pointers (O(Depth)). This significantly improves performance for filtering operations in visualizations like Sunburst. Updates the corresponding test suite to include parent pointers in the mock data, reflecting the actual structure provided by D3 hierarchies. Also adds a journal entry for the learning.
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💡 What: Optimized
NodeUtils.isParentOfto use bottom-up traversal usingparentpointers instead of recursive top-down search.🎯 Why: The original implementation had O(Subtree Size) complexity (effectively O(N) per call in worst case), leading to O(N^2) complexity when filtering large datasets (e.g., in
Sunburst.ts). The new implementation has O(Depth) complexity (usually < 20), resulting in O(N * Depth) overall complexity.📊 Impact: Significantly faster filtering and rendering of visualizations, especially for deep hierarchies.
🔬 Measurement: Verified with existing tests and updated unit tests to match D3 hierarchy structure.
PR created automatically by Jules for task 3744901652406601992 started by @pverscha