We have a cogroup where sometimes we cogroup like this:
Dataset z = larger.coGroup(small).where...
The strategy is printed as hash on key and a sort asc on the other key. Which
is which? Naively, we'd want to hash larger and sort the small? Or is that
wrong?
What factors would impact the perfo
Hi Billy,
A CoGroup does not have any freedom in its execution strategy.
It requires that both inputs are partitioned on the grouping keys and are
then performs a local sort-merge join, i.e, both inputs are sorted.
Existing partitioning or sort orders can be reused.
Since there is only one execut
