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Koalas is pandas API on PySpark

References

https://github.com/databricks/koalas

https://databricks.com/blog/2020/08/11/interoperability-between-koalas-and-apache-spark.html

https://notebooks.gesis.org/binder/jupyter/user/databricks-koalas-mxw72n1l/notebooks/docs/source/getting_started/10min.ipynb

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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