Github user mgaido91 commented on the issue:
https://github.com/apache/spark/pull/23104
@guoxiaolongzte still that doesn't explain why we can push to the right
side too. I do believe that it is possible. If the right side contains more
than N items, where N is the limit size, the output will contains the
combinations of the first item from the left side and the first N items from
the right side. If the right side contains less than N items, pushing the limit
on its side has no effect on the result.
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