felipecrv commented on issue #43768:
URL: https://github.com/apache/arrow/issues/43768#issuecomment-2299997262
It's weird because `COUNT` is weird in SQL.
```sql
SELECT a, COUNT(5) FROM test1 GROUP BY a;
```
will return the value of column `a` for each group and `COUNT(<any literal
here>)` will count the size of the group.
But
```sql
SELECT a, any(TRUE) FROM test1 GROUP BY a;
```
will always produce `TRUE` and never bother looking at the values in the
grouped values from the table.
I think it would be worth having a comment in the `CountImpl` branch that
handles scalars by ignoring the scalar value.
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