Fokko commented on code in PR #41:
URL: https://github.com/apache/iceberg-python/pull/41#discussion_r1452174491
##########
pyiceberg/table/__init__.py:
##########
@@ -1910,3 +2006,137 @@ def _generate_snapshot_id() -> int:
snapshot_id = snapshot_id if snapshot_id >= 0 else snapshot_id * -1
return snapshot_id
+
+
+@dataclass(frozen=True)
+class WriteTask:
+ write_uuid: uuid.UUID
+ task_id: int
+ df: pa.Table
+ sort_order_id: Optional[int] = None
+
+ # Later to be extended with partition information
+
+ def generate_datafile_filename(self, extension: str) -> str:
+ # Mimics the behavior in the Java API:
+ #
https://github.com/apache/iceberg/blob/a582968975dd30ff4917fbbe999f1be903efac02/core/src/main/java/org/apache/iceberg/io/OutputFileFactory.java#L92-L101
+ return f"00000-{self.task_id}-{self.write_uuid}.{extension}"
+
+
+def _new_manifest_path(location: str, num: int, commit_uuid: uuid.UUID) -> str:
+ return f'{location}/metadata/{commit_uuid}-m{num}.avro'
+
+
+def _generate_manifest_list_filename(snapshot_id: int, attempt: int,
commit_uuid: uuid.UUID) -> str:
+ # Mimics the behavior in Java:
+ #
https://github.com/apache/iceberg/blob/c862b9177af8e2d83122220764a056f3b96fd00c/core/src/main/java/org/apache/iceberg/SnapshotProducer.java#L491
+ return f"snap-{snapshot_id}-{attempt}-{commit_uuid}.avro"
+
+
+def _dataframe_to_data_files(table: Table, df: pa.Table) -> Iterable[DataFile]:
+ from pyiceberg.io.pyarrow import write_file
+
+ write_uuid = uuid.uuid4()
+ counter = itertools.count(0)
+
+ # This is an iter, so we don't have to materialize everything every time
+ # This will be more relevant when we start doing partitioned writes
+ yield from write_file(table, iter([WriteTask(write_uuid, next(counter),
df)]))
+
+
+class _MergeAppend:
+ _operation: Operation
+ _table: Table
+ _snapshot_id: int
+ _parent_snapshot_id: Optional[int]
+ _added_datafiles: List[DataFile]
+ _existing_datafiles: List[DataFile]
+ _commit_uuid: uuid.UUID
+
+ def __init__(self, operation: Operation, table: Table, snapshot_id: int)
-> None:
+ self._operation = operation
+ self._table = table
+ self._snapshot_id = snapshot_id
+ # Since we only support the main branch for now
+ self._parent_snapshot_id = snapshot.snapshot_id if (snapshot :=
self._table.current_snapshot()) else None
+ self._added_datafiles = []
+ self._existing_datafiles = []
+ self._commit_uuid = uuid.uuid4()
+
+ def append_datafile(self, data_file: DataFile, added: bool = True) ->
_MergeAppend:
+ if added:
+ self._added_datafiles.append(data_file)
+ else:
+ self._existing_datafiles.append(data_file)
+ return self
+
+ def _manifests(self) -> Tuple[Dict[str, str], List[ManifestFile]]:
+ ssc = SnapshotSummaryCollector()
+ manifests = []
+
+ if self._added_datafiles:
+ output_file_location =
_new_manifest_path(location=self._table.location(), num=0,
commit_uuid=self._commit_uuid)
+ with write_manifest(
+ format_version=self._table.format_version,
+ spec=self._table.spec(),
+ schema=self._table.schema(),
+ output_file=self._table.io.new_output(output_file_location),
+ snapshot_id=self._snapshot_id,
+ ) as writer:
+ for data_file in self._added_datafiles +
self._existing_datafiles:
+ writer.add_entry(
+ ManifestEntry(
+ status=ManifestEntryStatus.ADDED,
Review Comment:
Great catch, I've changed this by keeping the manifest-entries instead.
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