Per-LOD column statistics: identity (lod, numGaussians), the column-name
axis (columns), and the aligned measurement arrays (data).
JSON.stringify of this is the stats JSON output shape (NaN fields — e.g.
an all-NaN column's min — serialize as null).
Per-LOD column statistics: identity (
lod,numGaussians), the column-name axis (columns), and the aligned measurement arrays (data).JSON.stringifyof this is the stats JSON output shape (NaN fields — e.g. an all-NaN column's min — serialize asnull).