Apache Spark 3 for Data Engineering and Analytics with Python - Map and Flat Map Transformations

The video tutorial covers two RTD transformations: map and flat map. It begins with an introduction to these transformations, followed by a detailed explanation of the map transformation, including an example where a list of numbers is squared and transformed into a list of tuples. The tutorial then demonstrates how to create and print a transformed RDD using the map function. Finally, the flat map transformation is introduced, showing how it can flatten a list of words into a list of letters.

What is the primary purpose of the map transformation in RTD?

• To reduce the number of records

• To apply complex operations while maintaining the same number of records

• To sort the data

• To filter out unwanted data

In the example of squaring numbers, what is the role of the Lambda function?

• To filter out even numbers

• To create a new list of numbers

• To define the operation for squaring each number

• To sort the numbers in ascending order

What does the map transformation return when applied to a list of numbers?

• A list of strings

• A single number

• A list of tuples with original and squared numbers

• A list of numbers

In the word transformation example, what additional information is stored in the tuple besides the word itself?

• The first letter of the word

• The last letter of the word

• The number of vowels in the word

• The length of the word

What is the key difference between map and flat map transformations?

• Flat map can only be used with numbers

• Map returns a flattened structure

• Flat map can flatten nested structures

• Map is faster than flat map

How does the flat map transformation handle a list of words?

• It duplicates each word

• It converts each word into a list of letters

• It sorts the words alphabetically

• It filters out words with less than 3 letters

What is the output of the flat map transformation in the given example?

• A list of words

• A list of sentences

• A list of numbers

• A list of letters