Add samples on howto create dataframes

[acs]

Some nice references:

https://github.com/hortonworks/data-tutorials/wiki https://docs.databricks.com/spark/latest/dataframes-datasets/introduction-to-dataframes-scala.html

[acs]

A Dataframe is an RDD with an schema, The key is howto manage the schema that defines the RDD contents. Scala case classes is a great way to do it. But there are others, like specifying manually the schema and use it to create the datafrane using the RDD.

[acs]

Already done examples at https://github.com/acs/spark-performance-testing/blob/master/src/main/scala/personal/acs/spark/App.scala#L49

[acs]

Too specific for the intro. Closing.