lserlohn questions

• Spark: Poor performance on distributed system. How to improve>
• cast function is extremely memory consuming, how to handle it?
• Best solution for version conflict in Spark program
• Scala way to remove duplicate in an Array
• How does one flatten an array of arrays in Scala?
• get nearest data from dataframe in R [duplicate]
• how to use dataframe between_time() function
• How to explode an array into multiple columns in Spark
• how to create all zero dataframe in Python
• How to remove the date information in a column, just keep time

lserlohn answers