asubiotto opened a new issue, #21178:
URL: https://github.com/apache/datafusion/issues/21178
## Describe the bug
#18561 added REE type coercion but missed the arithmetic path. Arithmetic
operations on RunEndEncoded columns fail during planning with:
```
Cannot coerce arithmetic expression RunEndEncoded("run_ends": non-null
Int32, "values": non-null Int64) + Int64 to valid types
```
## To Reproduce
Attempt any arithmetic expression involving a `RunEndEncoded` column, e.g.
`ree_col + 1` where `ree_col` is `RunEndEncoded<Int32, Int64>`.
## Expected behavior
Arithmetic coercion should unwrap the REE value type, matching Dictionary
behavior.
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