andygrove opened a new pull request, #3493:
URL: https://github.com/apache/datafusion-comet/pull/3493
## Summary
- Makes `relabel_array` in `cast_column.rs` recursive so it correctly
handles nested type mismatches (field names/metadata differences) in List,
LargeList, Map, and Struct arrays
- The previous shallow `ArrayData` type swap caused panics when Arrow's
`ArrayData::build()` validated child types recursively
- Fixes three failure categories: List element naming ("item" vs "element"),
Map field naming ("key_value" vs "entries"), and PARQUET:field_id metadata
mismatches in nested structures
## Test plan
- [x] Added unit test for List field name relabeling ("item" -> "element")
- [x] Added unit test for Map entries field relabeling ("key_value" ->
"entries")
- [x] Added unit test for Struct with PARQUET:field_id metadata stripping
- [x] Added unit test for nested Struct containing List with different field
names
- [x] All existing tests continue to pass
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