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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/11/18 10:47:12 UTC

[GitHub] [arrow-datafusion] jackwener commented on pull request #4232: separate `projection` and `alias-projection`

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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