findepi opened a new issue, #12272:
URL: https://github.com/apache/datafusion/issues/12272
### Is your feature request related to a problem or challenge?
I as a user want to be able to inspect type of expressions. Example usage is
to inspect different sides of the comparison (column vs expression) to make
sure there is no implicit cast preventing or limiting predicate pushdown.
The type inspection should also help me write a CAST.
### Describe the solution you'd like
A function similar to `arrow_typeof` which reveals the SQL type of an
expression.
### Describe alternatives you've considered
Using `arrow_typeof` function. Teturn result of that function cannot be used
in a CAST:
```
DataFusion CLI v41.0.0
> SELECT arrow_typeof('a');
+-------------------------+
| arrow_typeof(Utf8("a")) |
+-------------------------+
| Utf8 |
+-------------------------+
1 row(s) fetched.
Elapsed 0.015 seconds.
> SELECT CAST('a' AS Utf8);
This feature is not implemented: Unsupported SQL type
Custom(ObjectName([Ident { value: "Utf8", quote_style: None }]), [])
```
### Additional context
None
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