[I] Panic when casting dictionary type values to partition values [datafusion]

[via GitHub]

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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