how spark collects non-match results after performing broadcast left outer join

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how spark collects non-match results after performing broadcast left outer join

farshaddp
Does anybody know how spark collects non-match results after performing
broadcast hash left outer join?

Suppose we have 4 nodes. 1 driver and 3 executors. We broadcast the left
table. After left outer join is performed in each executor, how does spark
recognize which records have not been matched, and how does it collect them
to the final result?



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