moomindani commented on code in PR #3630:
URL: https://github.com/apache/iceberg-python/pull/3630#discussion_r3562617906
##########
pyiceberg/partitioning.py:
##########
@@ -115,13 +117,36 @@ def map_source_ids_onto_source_id(cls, data: Any) -> Any:
if len(source_ids) == 0:
raise ValueError("Empty source-ids is not allowed")
if len(source_ids) > 1:
- raise ValueError("Multi argument transforms are not
yet supported")
+ if data.get("transform") is None:
+ raise ValueError("Transform is required for a
multi-argument field")
+ # Multi-argument transforms cannot be evaluated; per
the spec, v3 readers
+ # must read tables with such transforms, ignoring them
+ data["transform"] =
UnknownTransform(transform=str(data["transform"]))
+ else:
+ data.pop("source-ids", None)
data["source-id"] = source_ids[0]
return data
+ @model_serializer(mode="wrap")
+ def _serialize_source_ids(self, handler: Any) -> Any:
+ serialized = handler(self)
+ # Per the spec, single-argument transforms write only source-id and
+ # multi-argument transforms write only source-ids
+ if self.source_ids is not None and len(self.source_ids) > 1:
+ serialized.pop("source-id", None)
+ serialized.pop("source_id", None)
+ else:
+ serialized.pop("source-ids", None)
+ serialized.pop("source_ids", None)
+ return serialized
+
def __str__(self) -> str:
"""Return the string representation of the PartitionField class."""
- return f"{self.field_id}: {self.name}:
{self.transform}({self.source_id})"
+ if self.source_ids is not None and len(self.source_ids) > 1:
+ sources = ", ".join(str(s) for s in self.source_ids)
+ else:
+ sources = str(self.source_id)
+ return f"{self.field_id}: {self.name}: {self.transform}({sources})"
Review Comment:
Updated `SortField.__str__` in 818e6f99 to render all source ids the same
way as `PartitionField.__str__`.
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