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Explain fold() operation in spark?
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Answer / Narendra Pal Singh
The fold() operation in Spark is a reduction function that reduces a RDD (Resilient Distributed Dataset) to a single value by iteratively combining all elements using an associative binary function. The fold() function takes two arguments: a seed value and a function for combining values. Unlike reduce(), fold() returns the initial seed value instead of the accumulator after iteration.
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