Path of the file to which this OutputWriter is supposed to write. Note that
this may not point to the final output file. For example,
FileOutputFormat writes to
temporary directories and then merge written files back to the final destination. In
path points to a temporary output file under the temporary directory.
Schema of the rows to be written. Partition columns are not included in the schema if the relation being written is partitioned.
The Hadoop MapReduce task context.