FieldDescriptor

FieldDescriptor = NominalFieldDescriptor | OrdinalFieldDescriptor | QuantitativeFieldDescriptor | TemporalFieldDescriptor | CyclicFieldDescriptor | GeometryFieldDescriptor | IdentifierFieldDescriptor

Defined in: packages/model-dataset/src/frame/field.ts:121

One column’s name, measurement scale and presentation metadata.

A frame’s schema is data, inspectable at runtime — which is what lets a renderer decide what it can draw without being told.

There is deliberately no interval kind: a span is two fields plus an x/x2 encoding, which keeps every column scalar and typed-array-capable. A histogram is binStart/binEnd/count; a Gantt row is startedAt/endedAt.