haruband opened a new issue, #15649:
URL: https://github.com/apache/datafusion/issues/15649
### Describe the bug
I have encountered an error while copying to Parquet with a partition column
that is dictionary-encoded.
```
thread 'tokio-runtime-worker' panicked at
datafusion/datasource/src/write/demux.rs:516:31:
index out of bounds: the len is 2 but the index is 2
```
### To Reproduce
```
RUST_BACKTRACE=1 datafusion-cli
> CREATE TABLE test0 AS VALUES ('foo',1), ('bar',2), ('foo',3);
> COPY (SELECT arrow_cast(column1, 'Dictionary(Int32, Utf8)') AS column1,
column2 FROM test0) TO 'test_files/scratch/copy/part_dict_test' STORED AS
PARQUET PARTITIONED BY (column1);
thread 'tokio-runtime-worker' panicked at
datafusion/datasource/src/write/demux.rs:516:31:
index out of bounds: the len is 2 but the index is 2
...
```
### Expected behavior
```
+-------+
| count |
+-------+
| 3 |
+-------+
1 row(s) fetched.
Elapsed 0.028 seconds.
```
### Additional context
_No response_
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