Som questions

Som answers

• Why does Spark not push down a filter to before a groupBy with collect_list?
• Spark ML - MulticlassClassificationEvaluator - can we get precision/recall by each class label?
• How to Read a parquet file , change datatype and write to another Parquet file in Hadoop using pyspark
• Spark SQL Java Unable to convert fromTuple to Row and Dataframe
• PySpark - getting number of elements of array with same value