One sample as a tuple matching TRACK_SCHEMA. Every channel is optional
— including lat/lng, absent for a GPS-less indoor activity (the series is then
just time + the recorded channels). Absent values are undefined: the
constructor accepts undefined for required: false columns and records it in
the validity bitmap (lossless); as of pond 0.29 RowForSchema honors
required: false so the row type admits it too. It rejects null and NaN.
One sample as a tuple matching TRACK_SCHEMA. Every channel is optional — including lat/lng, absent for a GPS-less indoor activity (the series is then just time + the recorded channels). Absent values are
undefined: the constructor acceptsundefinedforrequired: falsecolumns and records it in the validity bitmap (lossless); as of pond 0.29RowForSchemahonorsrequired: falseso the row type admits it too. It rejectsnullandNaN.