Github user wzhfy commented on the issue:
https://github.com/apache/spark/pull/17286
@ioana-delaney How can we get disconnected parts before reordering? They
can not only be leaf tables (this case is easier to deal with), but also
subplans (tables can be joined internally but among subplans there's no join
condition). We need to consider both cases and they may co-exist. Also, some
disconnection can be eliminated by reordering.
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