kawadakk commented on issue #12709:
URL: https://github.com/apache/datafusion/issues/12709#issuecomment-4190254028
@theirix Thank you for the fix, but `Binary || Binary` still evaluates to
`Utf8`, which does not work if they are not valid UTF-8 strings and does not
match PostgreSQL's behavior:
```console
$ datafusion-cli
> select arrow_typeof(x'31' || x'32');
+--------------------------------------------+
| arrow_typeof(Binary("49") || Binary("50")) |
+--------------------------------------------+
| Utf8 |
+--------------------------------------------+
1 row(s) fetched.
Elapsed 0.003 seconds.
> select x'ff' || x'af';
Optimizer rule 'simplify_expressions' failed
caused by
Arrow error: Invalid argument error: Encountered non UTF-8 data: invalid
utf-8 sequence of 1 bytes from index 0
```
```console
$ psql
postgres=# select decode('31', 'hex') || decode('32', 'hex');
?column?
----------
\x3132
(1 row)
postgres=# select decode('ff', 'hex') || decode('af', 'hex');
?column?
----------
\xffaf
(1 row)
```
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