randolf-scholz opened a new issue, #41382:
URL: https://github.com/apache/arrow/issues/41382
### Describe the bug, including details regarding any error messages,
version, and platform.
Timestamps with second resolution get upcasted to millisecond resolution
when serializing and deserializing. They should either round trip, or there
should be a warning/error when attempting to serialize them.
```python
from datetime import datetime
import pyarrow as pa
import pyarrow.compute as pc
from pyarrow import parquet
dates = [
datetime(2021, 1, 1, 0, 0, 3),
datetime(2021, 1, 1, 0, 0, 4),
datetime(2021, 1, 1, 0, 0, 5),
]
table = pa.table({"time": pa.array(dates, type=pa.timestamp("s"))})
print(table.schema) # timestamp[s]
parquet.write_table(table, "timestamp_roundtrip.parquet")
table2 = parquet.read_table("timestamp_roundtrip.parquet")
print(table2.schema) # timestamp[ms]
```
### Component(s)
Parquet
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