How to create a dataframe using a custom schema in Spark? This is one of the most common interview questions.…
This post will explain the difference between the SQL functions rownum and rowid. ROWID : 1). ROWID is a…
In most of your interviews you might have came across the question to write word count program in MapReduce or…
What is Scala Monad? Monad is neither a data type nor class/trait. Monad is a concept. There are lot ways…
What is SCDs or Slowly Changing Dimensions? Slowly changing dimensions is a concept related to data warehousing. They track the…
While executing Hive queries you might have observed that the MapReduce task won’t start when you do perform a Select…
I don’t think this question has a particular answer that certainly gives us the required result. Because data is peculiar.…
Currying in Scala is a technique of transforming a function that takes multiple arguments into a function that takes only…
Higher Order functions take other functions as parameters and return function as result, i.e., passing functions as parameters to other…
All the functions mentioned below are more or less same functionally, but there very minor differences among them. createOrReplaceTempView createTempView…