Fokko commented on code in PR #40:
URL: https://github.com/apache/iceberg-python/pull/40#discussion_r1352318212
##########
pyiceberg/avro/resolver.py:
##########
@@ -233,7 +256,93 @@ def skip(self, decoder: BinaryDecoder) -> None:
pass
-class SchemaResolver(PrimitiveWithPartnerVisitor[IcebergType, Reader]):
+class WriteSchemaResolver(PrimitiveWithPartnerVisitor[IcebergType, Writer]):
+ def schema(self, write_schema: Schema, data_schema: Optional[IcebergType],
result: Writer) -> Writer:
+ return result
+
+ def struct(self, write_schema: StructType, data_struct:
Optional[IcebergType], field_writers: List[Writer]) -> Writer:
+ if not isinstance(data_struct, StructType):
+ raise ResolveError(f"File/write schema are not aligned for struct,
got {data_struct}")
+
+ data_positions: Dict[int, int] = {field.field_id: pos for pos, field
in enumerate(data_struct.fields)}
+ results: List[Tuple[Optional[int], Writer]] = []
+
+ for writer, write_field in zip(field_writers, write_schema.fields):
+ if write_field.field_id in data_positions:
+ results.append((data_positions[write_field.field_id], writer))
+ else:
+ # There is a default value
+ if write_field.write_default is not None:
+ # The field is not in the record, but there is a write
default value
+ results.append((None, DefaultWriter(writer=writer,
value=write_field.write_default))) # type: ignore
+ elif write_field.required:
+ raise ValueError(f"Field is required, and there is no
write default: {write_field}")
+
+ return StructWriter(field_writers=tuple(results))
+
+ def field(self, write_field: NestedField, data_type:
Optional[IcebergType], field_writer: Writer) -> Writer:
+ return field_writer if write_field.required else
OptionWriter(field_writer)
+
+ def list(self, write_list_type: ListType, write_list:
Optional[IcebergType], element_reader: Writer) -> Writer:
Review Comment:
Nice, thanks!
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