alamb commented on code in PR #15652:
URL: https://github.com/apache/datafusion/pull/15652#discussion_r2035118761
##########
datafusion/sqllogictest/test_files/dictionary.slt:
##########
@@ -450,3 +450,10 @@ query I
select dense_rank() over (order by arrow_cast('abc', 'Dictionary(UInt16,
Utf8)'));
----
1
+
Review Comment:
I verified that this does indeed panic on main as reported
```sql
DataFusion CLI v46.0.1
> CREATE TABLE test0 AS VALUES ('foo',1), ('bar',2), ('foo',3);
0 row(s) fetched.
Elapsed 0.007 seconds.
> 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
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
```
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