Shaido questions

Shaido answers

• How to read first n rows without loading entire file?
• Spark multiple dynamic aggregate functions, countDistinct not working
• Combining csv files with mismatched columns
• Why does Spark infer a binary instead of an Array[Byte] when creating a DataFrame?
• Write each row of a spark dataframe as a separate file
• UnFlatten Dataframe to a specific structure
• Why Spark SQL translates String "null" to Object null for Float/Double types?
• Can I set different autoBroadcastJoinThreshold value in sparkConf for different sql？
• Iterate over elements of columns Scala
• Generate all combinations in pandas