PreFlightUnitsRow

class lsst.daf.butler.PreFlightUnitsRow(dataId, datasetRefs)

Bases: object

Simple data class holding combination of DataUnit values for one row returned by pre-flight solver.

Logically instance of this class represents a single “path” connecting a set of DatasetRefs which exist or may exist for a given set of DatasetTypes based on the DataUnit relational algebra.

Pre-flight solver returns a sequence of PreFlightUnitsRow instances, each instance will have unique dataId, but DatasetRef in datasetRefs are not necessarily unique. For example when pre-flight solver generates data for Quantum which has two DatasetRefs on input and one on output it will create two PreFlightUnitsRow instances with the same DatasetRef for output dataset type. It is caller’s responsibility to combine multiple PreFlightUnitsRow into a suitable structure (e.g. QuantumGraph).

Attributes:

dataId : dict

Maps DataUnit link name to its corresponding value.

datasetRefs : dict

Maps DatasetType to its corresponding DatasetRef.