Add column metadata panel with stats#27
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kdkavanagh merged 5 commits intomasterfrom Mar 26, 2026
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Splits the row detail pane into two vertically stacked sections: - Top: existing row detail (unchanged behavior) - Bottom: new column metadata panel showing statistics for the column at cursor position (five-number summary for numeric, top-10 value counts for categorical, min/max for temporal, value counts for boolean) Stats are lazily computed and cached per column, invalidated on filter. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Set RowDetail height to 1fr so ColumnMetadata is visible within the DetailPanel instead of being pushed off-screen - Sort categorical value_counts deterministically by count then name - Add integration tests that verify actual stats content is displayed (numeric five-number summary, categorical value counts, boolean counts) - Add test asserting ColumnMetadata is within the visible viewport - Update all snapshots to reflect the now-visible column metadata panel Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
DetailPanel.update_width() sets the panel width to the max of RowDetail and ColumnMetadata content widths, ensuring both children are always the same width. Both RowDetail and ColumnMetadata trigger update_width() on their parent after content changes. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- All column types now report null count when nulls are present - Numeric float columns report NaN count when NaNs are present - Null reporting moved from _boolean_stats to compute_column_stats so it applies uniformly to categorical, numeric, temporal, boolean Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Use @work(exclusive=True) to compute stats in a worker thread, avoiding blocking the main UI thread. Shows "Computing..." while stats are being calculated, then renders results on completion. Cache hits still return synchronously for instant updates. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
DetailPanelcontainerrtoggle (row detail)Test plan
make checkpasses (format, lint, typecheck — 10/10 pylint)🤖 Generated with Claude Code