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Description
SUMMARY indexes are now built automatically when a CTable is first closed, and they accelerate where() queries by skipping blocks that cannot match the predicate. This is a significant feature but it is only described in the API reference, not in any user-facing guide. The tutorial 15.indexing-ctables.ipynb covers FULL/PARTIAL indexes but does not mention SUMMARY at all.
Suggested work:
- Add a section to 15.indexing-ctables.ipynb explaining: what SUMMARY indexes store (per-block min/max), when they are built automatically, the create_summary_index=False opt-out, and how to verify they are being used.
- Add a short example that measures query time with and without a SUMMARY index on a realistic dataset
- Update doc/reference/ctable.rst to cross-reference the new create_summary_index parameter