Extracts column to type mapping for the hive table from the job configuration It uses 2
standard Hive Job parameters: LIST_COLUMNS ("columns") and LIST_COLUMN_TYPES
LIST_COLUMN_TYPES ("columns.types").
This InputSplit implementation is meant to be used with Hive, where path is non-null, and
takes a form of, e.g., hdfs://10.239.164.224:9000/mnt/hive_0110/warehouse/dynamodbtable that maps
to a DynamoDB table.