ygf11 commented on issue #4478:
URL:
https://github.com/apache/arrow-datafusion/issues/4478#issuecomment-1334964872
Yes, cast expression is ignored in the column name.
I think the other reason is our projection does not support duplicated items
which seems PostgreSQL and spark both support.
### spark ###
```sql
spark-sql> select 1,1,1,1,1;
1 1 1 1 1
1 1 1 1 1
Time taken: 0.337 seconds, Fetched 1 row(s)
```
### PostgreSQL ###
```sql
> select 1,1,1,1;
?column? | ?column? | ?column? | ?column?
----------+----------+----------+----------
1 | 1 | 1 | 1
(1 row)
```
### datafusion ###
```sql
❯ select 1, 1, 1, 1;
Plan("Projections require unique expression names but the expression
\"Int64(1)\" at position 0 and \"Int64(1)\" at position 1 have the same name.
Consider aliasing (\"AS\") one of them.")
```
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