alamb opened a new issue, #8853:
URL: https://github.com/apache/arrow-datafusion/issues/8853
### Describe the bug
I can't write a struct to parquet, instead I get the following error
> internal error: entered unreachable code: cannot downcast Int64 to byte
array
### To Reproduce
```shell
$ datafusion-cli
DataFusion CLI v34.0.0
❯ create table t as values (struct ('foo', 1)), (struct('bar', 2));
0 rows in set. Query took 0.004 seconds.
❯ select * from t;
+------------------+
| column1 |
+------------------+
| {c0: foo, c1: 1} |
| {c0: bar, c1: 2} |
+------------------+
2 rows in set. Query took 0.001 seconds.
❯ copy (select * from t) to '/tmp/foo.parquet';
thread 'tokio-runtime-worker' panicked at
/Users/andrewlamb/.cargo/registry/src/index.crates.io-6f17d22bba15001f/parquet-49.0.0/src/arrow/arrow_writer/byte_array.rs:441:9:
internal error: entered unreachable code: cannot downcast Int64 to byte array
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
```
### Expected behavior
I expect the parquet file to be written successfully. This works fine with
JSON:
```shell
$ datafusion-cli
DataFusion CLI v34.0.0
❯ create table t as values (struct ('foo', 1)), (struct('bar', 2));
0 rows in set. Query took 0.003 seconds.
❯ select * from t;
+------------------+
| column1 |
+------------------+
| {c0: foo, c1: 1} |
| {c0: bar, c1: 2} |
+------------------+
2 rows in set. Query took 0.001 seconds.
❯ copy (select * from t) to '/tmp/foo.json';
+-------+
| count |
+-------+
| 2 |
+-------+
1 row in set. Query took 0.010 seconds.
❯
\q
$ cat /tmp/foo.json
{"column1":{"c0":"foo","c1":1}}
{"column1":{"c0":"bar","c1":2}}
```
### Additional context
_No response_
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