jqin61 commented on code in PR #453:
URL: https://github.com/apache/iceberg-python/pull/453#discussion_r1506175834
##########
pyiceberg/partitioning.py:
##########
@@ -215,3 +246,59 @@ def assign_fresh_partition_spec_ids(spec: PartitionSpec,
old_schema: Schema, fre
)
)
return PartitionSpec(*partition_fields, spec_id=INITIAL_PARTITION_SPEC_ID)
+
+
+@dataclass(frozen=True)
+class PartitionFieldValue:
+ field: PartitionField
+ value: Any
+
+
+@dataclass(frozen=True)
+class PartitionKey:
+ raw_partition_field_values: List[PartitionFieldValue]
+ partition_spec: PartitionSpec
+ schema: Schema
+
+ @cached_property
+ def partition(self) -> Record: # partition key transformed with iceberg
internal representation as input
+ iceberg_typed_key_values = {}
+ for raw_partition_field_value in self.raw_partition_field_values:
+ partition_fields =
self.partition_spec.source_id_to_fields_map[raw_partition_field_value.field.source_id]
+ if len(partition_fields) != 1:
+ raise ValueError("partition_fields must contain exactly one
field.")
+ partition_field = partition_fields[0]
+ iceberg_type =
self.schema.find_field(name_or_id=raw_partition_field_value.field.source_id).field_type
+ iceberg_typed_value =
_to_iceberg_internal_representation(iceberg_type,
raw_partition_field_value.value)
+ transformed_value =
partition_field.transform.transform(iceberg_type)(iceberg_typed_value)
+ iceberg_typed_key_values[partition_field.name] = transformed_value
+ return Record(**iceberg_typed_key_values)
Review Comment:
Hi @Fokko, thanks for the guidance! My intention of adding the keys is
because this PartitionKey.partition is not only used for generating the file
path but also used to initiate the Datafile.partition in the
io.pyarrow.write_file(). As the integration test shows,
```
snapshot.manifests(iceberg_table.io)[0].fetch_manifest_entry(iceberg_table.io)[0].data_file.partition
```
prints
```
Record(timestamp_field=1672574401000000)
```
So I assume this data_file.partition is Record with keys.
Let me know what you think about it, thank you!
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