MohamedAbdeen21 commented on issue #10280:
URL: https://github.com/apache/datafusion/issues/10280#issuecomment-2093703254
Hey, this optimizer rule is used by so many test cases, so I wanted to
collect opinions before proceeding with implementing the change.
# My suggestion
Using `let alias_symbol = format!("${{{curr_expr_id}}}");` to mark common
expressions. So the query above would be:
```sql
AggregateExec: mode=Partial, gby=[${CAST(number.c0 AS Int64) + Int64(1)}@0
as number.c0 + Int64(1)], aggr=[COUNT(number.c0 + Int64(1))]
ProjectionExec: expr=[CAST(c0@0 AS Int64) + 1 as ${CAST(number.c0 AS
Int64) + Int64(1)}]
```
# Some naming alternatives I've considered
- Using `@0`, `@1`, etc ... However, the @ symbol is already used in the
physical plan (check the query above), which means that you may have columns
like `@0@0` which makes no sense.
- `let alias_symbol = format!("{curr_expr_id}").replace(" ", "_");`. Sound
like a good idea until you see it.
```sql
AggregateExec: mode=Partial, gby=[CAST(number.c0_AS_Int64)_+_Int64(1)@0 as
number.c0 + Int64(1)], aggr=[COUNT(number.c0 + Int64(1))]
ProjectionExec: expr=[CAST(c0@0 AS Int64) + 1 as
CAST(number.c0_AS_Int64)_+_Int64(1)
```
It's not immediately obvious + what happens if the column doesn't have a
space?
Please feel free to share other alternatives.
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