Skip finite/log visibility scans when zone maps already prove all-finite on linear axes
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Assessment
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Newbie friendliness
- 76/100
- Issue type
- Refactor
- Clarity
- Clearly specified
- Activity status
- Quiet
- Tech stack
- numpy, python
- Domain
- data-visualization, performance
Research direction
Start in python/xy/_payload.py at _finite_sel, _log_visible_mask, and the _emit_line and _emit_scatter call sites. Review the existing zone-map null_count and linear/log-axis behavior, then add focused tests for the fast path and log-axis cases. Done means finite scans are skipped only when null_count is zero and both axes are linear, with existing behavior preserved.
Written by the indexing model from the issue text.
Description
From a full data-transport audit at b0f8780.
Today: _finite_sel correctly consults zone-map null_count first (python/xy/_payload.py:352-362), but _log_visible_mask (_payload.py:364-380) — called unconditionally from _emit_line (:422) and :466-470) — then recomputes _emit_scatter (isfinite(xv) & isfinite(yv) plus np.all(mask): ~3-4 full O(N) passes per trace per build that are provably all-true when null_count == 0 and neither axis is log.
Proposed fix: guard with if null_count or x_log or y_log: before building the mask; return the no-mask fast path otherwise. Pure CPU win on every direct build of every line/scatter trace; one-line-ish change plus tests.
- Dominant language
- Python
- Stars
- 1.8k
- Forks
- 76
- Avg merge
- 1h 7m
- Merged PRs (30d)
- 8
Contributor guide
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