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Interview questions · hard
Explain Fact and Dimension Tables with examples.
Discuss common transformations used in Spark code.
Explain Delta Table features – Z-ordering and Time Travel.
Explain Spark Architecture – Driver, Executors, and Tasks.
Explain Spark's execution process – Job/Stage/Task creation.
GroupByKey vs ReduceByKey – Differences and performance implications?
How to fill null values in PySpark?
How to remove duplicates in PySpark?
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