jackwener commented on PR #4232:
URL:
https://github.com/apache/arrow-datafusion/pull/4232#issuecomment-1319832579
Spark doesn't have alias-projection. @mingmwang
We also can read `sql standard 2003`
Alias just contain
- `expr-alias (like: projection contain is expr)`
- `table-ref-alias`
```
select ('aa1', 'aa2' as AA1) as B
is Alias("B", Expr::List(aa1, Alias("AA1", aa2)))
```
Spark projection just contains `Seq[NamedExpr]` `input`
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