comphead opened a new issue, #2256:
URL: https://github.com/apache/datafusion-comet/issues/2256
### Describe the bug
The `cast StructType to StringType` fails on duplicated columns with auto
and native_scan
```
checkSparkAnswerAndOperator(
"SELECT CAST(struct(_12, _12) as string) FROM tbl")
Expected only Comet native operators, but found Project.
plan: *(1) Project [cast(struct(_12, _12#11, _12, _12#11) as string) AS
CAST(struct(_12, _12) AS STRING)#59]
+- *(1) CometColumnarToRow
+- CometScan [native_iceberg_compat] parquet [_12#11] Batched: true,
DataFilters: [], Format: CometParquet, Location: InMemoryFileIndex(1
paths)[file:/private/var/folders/6f/_s1vnnd55zgfkx7zlwnrnv0h0000gn/T/spark-76...,
PartitionFilters: [], PushedFilters: [], ReadSchema: struct<_12:decimal(20,0)>
```
Found when working on #2175
### Steps to reproduce
_No response_
### Expected behavior
_No response_
### Additional context
_No response_
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