Github user tejasapatil commented on the issue:
https://github.com/apache/spark/pull/19257
By "placeholder shuffle nodes" you mean dummy ones ? We need to know the
exact partitioning of the children which dummy nodes won't give (maybe I didn't
get what you meant). My fear is that `EnsureRequirements` might choose to make
some decisions about shuffle which would affect the results of
`ReorderJoinPredicates` rule.
I agree that we need to rethink about the planning phase for adding
shuffles.
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