How to ADD New Columns in DataFrame using PySpark

 Below are different ways to add new columns to dataframe in PySpark:

1. withColumn and lit
1. df.withColumn("NewColumnName", lit("default value for new column"))
2. withColumn and col (Derived column)
1. df.withColumn("NewColumnName", col("Column1") * col("Column2"))
3. select
1. df.select(lit("default column value").alias("NewColumnName"), col("Column1"), col("Column2"))