jackwener commented on PR #4141:
URL:
https://github.com/apache/arrow-datafusion/pull/4141#issuecomment-1311637198
@alamb @andygrove
I have find the reason of `projection include [c1, c2]`.
It's because the `pushdown project` rule don't handle `alias`. In fact, when
handle `projection with alias`, we need replace the `alias column` in
`new_required_columns`.
For example:
```
project c1 as c2
tablescan c1.
```
when we meet `project c1 as c2`, if `new_required_columns` include c2, we
need replace it with c1.
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