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Tap for Avro files on local file system or GCS.
must be not null if T is of type GenericRecord.
T
Map items from T to U.
U
Open data set as an SCollection.
Parent of this Tap before map.
Read data set into memory.
Tap for Avro files on local file system or GCS.
must be not null if
T
is of type GenericRecord.