PySpark reduceByKey on multiple values -


if have k,v pair like:

(k, (v1, v2)) (k, (v3, v4))

how can sum values such (k, (v1 + v3, v2 + v4)) ?

reducebykey supports functions. lets array of key-value pairs.

output = a.reducebykey(lambda x, y: x[0]+y[0], x[1]+y[1])

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