When using TPT/BTEQ to export/import Data from Teradata, Teradata will generate/require binary files based on the schema.
A Customized SerDe is needed in order to directly read these files from Hive or write these files in order to load back to TD.
Right now the fast way to export/import data from Teradata is using TPT. However, the Hive could not directly utilize/generate these binary format because it doesn't have a SerDe for these files.
Provided with the SerDe, Hive can operate upon/generate the exported Teradata Binary Format file transparently