Dask, Big Data, Data Science, Performance, Python.
var1] forders = orders_ds[orders_ds.o_orderdate < var1] fcustomer = cutomer_ds[cutomer_ds.c_mktsegment == var2] jn1 = fcustomer.merge(forders, left_on="c_custkey", right_on="o_custkey") jn2 = jn1.merge(flineitem, left_on="o_orderkey", right_on="l_orderkey") jn2["revenue"] = jn2.l_extendedprice * (1