[SEDONA-690] Optimize query side broadcast knn join #1741
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Is this PR related to a JIRA ticket?
[SEDONA-XXX] my subject.What changes were proposed in this PR?
This PR is to broadcast the query side data to objects and then on the reducing process, group, sort and reduce it to global knn results. We also include an optimization that avoid repartitioning the broadcast side in this task.
How was this patch tested?
New tests are added to KNNJoinSuit.
Did this PR include necessary documentation updates?