houqp edited a comment on issue #617:
URL: 
https://github.com/apache/arrow-datafusion/issues/617#issuecomment-867889224


   hmm... the projection push down should be able to handle unqualified columns 
without problem, i.e. the current design doesn't require clients to add 
qualifiers to all the fields. Do you have a reproducible example i can play 
with? I definitely didn't test the change with extension nodes.


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