Github user viirya commented on the issue:
https://github.com/apache/spark/pull/18968
@cloud-fan OK. I think I got your point. Your proposal is to have
`ListQuery.childOutputs` which keeps the original output of subquery. Even we
extend the project list of subquery, `childOutputs` is unchanged.
If that is correct, my only concern is if we extend the project list by
adding attributes which are not in condition, we aren't able to find it out.
This is basically a safe guard for the possibility we mess the query plan
in optimization, if you think it is not necessary, I think your proposal is a
good choice.
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