References¶
https://github.com/databricks/koalas
https://databricks.com/blog/2020/08/11/interoperability-between-koalas-and-apache-spark.html
https://spark.apache.org/docs/latest/api/python/pyspark.sql.html
https://spark.apache.org/docs/latest/api/python/pyspark.sql.html#pyspark.sql.DataFrame
https://spark.apache.org/docs/latest/api/python/pyspark.sql.html#pyspark.sql.Column
https://spark.apache.org/docs/latest/api/python/pyspark.sql.html#module-pyspark.sql.functions
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