Reference:
- https://sparkbyexamples.com/spark/spark-sql-date-and-time-functions/
- https://blog.golang.org/waza-talk
- https://github.com/apache/spark/blob/master/examples/src/main/java/org/apache/spark/examples/JavaSparkPi.java
- Talks about RDD/Dataset/Dataframe and optimization https://www.databricks.com/blog/2016/07/14/a-tale-of-three-apache-spark-apis-rdds-dataframes-and-datasets.html
- What is RDD? https://www.databricks.com/glossary/what-is-rdd