How to create a dataframe using a custom schema in Spark? This is one of the most common interview questions.…
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.…
All the functions mentioned below are more or less same functionally, but there very minor differences among them. createOrReplaceTempView createTempView…
mapValues – This function works with PairRDDs only. So this function always requires an RDD of type RDD[(a,b)]. mapValues functions…
Hive has so many clubbing operations like Order By, Sort By etc. Each clause it’s own uses, advantages and disadvantages.…
Assume that we have a table as below: Column_name 1 -2 3 -4 5 Need to write a query to…
Some you will be asked a question in Hive like, we have a table in which one of the columns…