question: applies a transform to the given input , returning the output . the default implementation calls ptransform.apply input , but can be overridden to customize behavior for a particular runner . concode_field_sep PlaceHolder placeHolder concode_field_sep PipelineRunner<? extends PipelineResult> fromOptions concode_elem_sep ResultT run
target: OutputT function ( PTransform < InputT , OutputT > arg0 , InputT arg1 ) { return arg0 . apply ( arg1 ) ; }