||Currently this class is a stub that could be extended to include
configuration parameters specific to SMS jobs.
||SMSInputFormat extends FileInputFormat to allow access to path
information set by Hive and needed to recreate Map operators.
||This class extends the base DBInputSplit class and additionally
serializes path information needed by Hive to rebuild map operators
from the data path being processed.
||SMSRecordReaders extends AbstractDBRecordReader and specializes the
value class to Text (in contrast to DBRecordReader that allows
arbitrary value classes).