For the CCA 175 exam, can I solve the questions with using Spark SQL only? Spark SQL seems easier than Core API or DF operations - does it matter what we use to solve the question? Is it ok to skip doing the Core API way and focus on Spark SQL to prepare?
Also can we launch and use spark2-shell only and not use spark-shell (1.6) ? Spark 2 has many direct options like spark.read.csv for directly reading the comma delimited text files.