milesgranger opened a new pull request, #13938:
URL: https://github.com/apache/arrow/pull/13938
Without this patch, the following is possible:
```python
import pyarrow as pa
import pyarrow.parquet as pq
t = pa.Table.from_pydict({'a': [1,2,3]})
t = t.add_column(0, 'a', pa.array([4, 5, 6])) # Adding column with same
field name
pq.write_table(t, 'file.parquet') # OK
pq.read_table('file.parquet') # Error
...
ArrowInvalid: Multiple matches for FieldRef.Name(a) in a: int64
a: int64
__fragment_index: int32
__batch_index: int32
__last_in_fragment: bool
__filename: string
```
This patch will prevent `pq.write_table(...)` from writing a table with
duplicate field names:
```python
t.write_table(t, 'file.parquet')
...
ArrowInvalid: Cannot write parquet table with duplicate field names: a
```
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