jackwener commented on issue #5407:
URL:
https://github.com/apache/arrow-datafusion/issues/5407#issuecomment-1446256005
> I assume the intention is for this to be an rule during logical plan
optimization (at the end?)
We can remove it at a relatively early stage, so plan can be optimized by
`PushdownProjection` `EliminateProjection` again.
I think a **possible** method : we can use alias to **keep schema
unchanged** like following
```
Projection: t1.a
SubqueryAlias: t1
Filter: ta.a = Int64(1)
TableScan: ta projection=[a]
to:
Projection: ta.a as t1.a
Filter: ta.a = Int64(1)
TableScan: ta projection=[a]
```
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