Hive on Spark Vs Spark SQL

[kiran lonikar]

I would like to know if Hive on Spark uses or shares the execution code
with Spark SQL or DataFrames?

More specifically, does Hive on Spark benefit from the changes made to
Spark SQL, project Tungsten? Or is it completely different execution path
where it creates its own plan and executes on RDD?

-Kiran