Github user eatoncys commented on the issue:
https://github.com/apache/spark/pull/21823
@cloud-fan
case j @ Join(left, right, _, _) if !j.duplicateResolved =>
j.copy(right = dedupRight(left, right))
dedupRight generate a new logical plan for the right child, which get the
'key' from the original table 'src', but left not.
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