Return an RDD with the keys of each tuple.
m = sc.parallelize([1, 2), (3, 4)]).keys()
m.collect()
# [1, 3]Return an RDD with the keys of each tuple.
m = sc.parallelize([1, 2), (3, 4)]).keys()
m.collect()
# [1, 3]Copyright © 2021 Codeinu
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