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Interview questions
What is the difference between repartition and coalesce in Apache Spark?
What is the difference between narrow and wide transformations in Apache Spark? Explain with examples.
Explain the difference between Spark's map() and flatMap() transformations.
How does Spark's Catalyst Optimizer work? Explain its stages.
What is the difference between Managed and External tables in Hive/Spark?
Explain the concept of Broadcast Join in Spark. When should it be used?
Explain the difference between shallow copy and deep copy in Python.
Write a Python function to find the first non-repeating character in a string.
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