Github user guoxiaolongzte commented on the issue:
https://github.com/apache/spark/pull/23104
Cartesian product refers to the Cartesian product of two sets X and Y in
mathematics , also known as direct product , expressed as X Ã Y , the first
object is a member of X and the second object is One of all possible ordered
pairs of Y.So cross join mustpush it on the left side.
For example, A={a,b}, B={0,1,2}, then
A Ã B = {(a, 0), (a, 1), (a, 2), (b, 0), (b, 1), (b, 2)}
BÃA={(0, a), (0, b), (1, a), (1, b), (2, a), (2, b)}
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