dataFrameDropEmptyFields
dataFrameDropEmptyFields(
frame):DataFrame
Defined in: packages/model-dataset/src/frame/data-frame.ts:277
A frame carrying only the fields that hold at least one non-null cell.
O(r × f) worst case, less when a column has an early non-null. Columns are
shared with the source frame, not copied. Applied by the caller and never by
a renderer: a stable schema is sometimes the point, as it is for CSV
headers.