Markus questions

• How to set yesterday's date using Scala?
• How to calculate the power of 2 for the column of DataFrame
• How to save pandas DataFrame's rows as JSON strings?
• Caused by: java.lang.NullPointerException at org.apache.spark.sql.Dataset
• How to extract countries from a text?
• How to calculate mean and standard deviation given a PySpark DataFrame?
• How to access SparkContext from SparkSession instance?
• How to convert list of dictionaries into Pyspark DataFrame
• AssertionError: col should be Column
• Total size of serialized results of 16 tasks (1048.5 MB) is bigger than spark.driver.maxResultSize (1024.0 MB)

Markus answers