b-phi commented on issue #1619:
URL:
https://github.com/apache/iceberg-python/issues/1619#issuecomment-2648608512
Thanks Kevin, I should have been more clear. I am using the downcasting
functionality, which works great for unpartitioned tables. Even an
`IdentityTransform()` partition over a downcasted timestamp column works fine,
but any of the time truncations like `DayTransform` or `YearTransform` result
in the arrow kernel error above.
A table with the partition spec will handle downcasting timestamps correctly
on write
```python
partition_spec = PartitionSpec(
PartitionField(source_id=1, field_id=1001,
transform=IdentityTransform(), name='ts'),
)
```
But this partition spec throws the error
```python
partition_spec = PartitionSpec(
PartitionField(source_id=1, field_id=1001, transform=DayTransform(),
name='date'),
)
```
The write code
```python
os.environ['PYICEBERG_DOWNCAST_NS_TIMESTAMP_TO_US_ON_WRITE'] = '1'
schema = pa.schema([pa.field('timestamp', pa.timestamp('ns'))])
data = pa.Table.from_pydict({'timestamp': [1]}, schema=schema)
table.append(data)
```
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