Jason Donnald questions

• How to select multiple non-contigous columns from a list into another dataframe in python
• How to add columns of 2 RDDs to from a single RDD and then do aggregation of rows based on date data in PySpark
• How to open a .data file extension
• How to upgrade Spark to newer version?
• How to write the resulting RDD to a csv file in Spark python
• return a variable value from a subprocess in python

Jason Donnald answers