Rebuild Ordinals map in FilterBy for filtered column slice#15
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Recompute Ordinals for filtered column lists. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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FilterBy returned a new ColumnList sharing the parent's Ordinals map, which maps to indices in the original (unfiltered) column slice. GetColumn() on the filtered list could return wrong columns or panic with index out of range.