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"Why does repartition cause a full shuffle but coalesce doesn't?"
repartition() always shuffles every row across the network. coalesce() merges existing partitions on the same executor — no data movement...
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Built full-stack e-commerce platform with real-time inventory, payment processing, and mobile optimisation.
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The Spark partitioning animation finally made AQE click for me. I'd read the docs 10 times. One animated tutorial and I understood it completely.
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