Description
We should add more data frame usage examples for SparkR . This can be similar to the python examples at https://github.com/apache/spark/blob/1b2aab8d5b9cc2ff702506038bd71aa8debe7ca0/examples/src/main/python/sql.py
We should add more data frame usage examples for SparkR . This can be similar to the python examples at https://github.com/apache/spark/blob/1b2aab8d5b9cc2ff702506038bd71aa8debe7ca0/examples/src/main/python/sql.py