Package debug contains pipeline components that may help in debugging pipeline issues.
func Discard(s beam.Scope, col beam.PCollection)
Discard is a sink that discards all data.
func Head(s beam.Scope, col beam.PCollection, n int) beam.PCollection
Head returns the first "n" elements it sees, it doesn't enforce any logic as to what elements they will be.
func Print(s beam.Scope, col beam.PCollection) beam.PCollection
Print prints out all data. Use with care.