Interview questions · medium
What is the purpose of the Bronze, Silver, and Gold layers in a data pipeline?
How does indexing improve query performance in SQL?
How would you deal with data skewness in a join operation?
How would you deal with data skewness in a large dataset?
Solve a problem using a window function in Spark or SQL.
map() vs mapPartitions(): Highlight the difference between map (row-level transformation) and mapPartitions (partition-level transformation).
repartition() vs coalesce(): Explain when to use repartition() (increases partitions) vs coalesce() (reduces partitions).
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