rdblue commented on code in PR #41:
URL: https://github.com/apache/iceberg-python/pull/41#discussion_r1456486632
##########
pyiceberg/table/__init__.py:
##########
@@ -1935,3 +2043,184 @@ 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_data_file_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_path(location: str, 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'{location}/metadata/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
+
+ if len(table.spec().fields) > 0:
+ raise ValueError("Cannot write to partitioned tables")
+
+ if len(table.sort_order().fields) > 0:
+ raise ValueError("Cannot write to tables with a sort-order")
+
+ 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_data_files: 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_data_files = []
+ self._commit_uuid = uuid.uuid4()
+
+ def append_data_file(self, data_file: DataFile) -> _MergeAppend:
+ self._added_data_files.append(data_file)
+ return self
+
+ def _deleted_entries(self) -> List[ManifestEntry]:
+ """To determine if we need to record any deleted entries.
+
+ With partial overwrites we have to use the predicate to evaluate
+ which entries are affected.
+ """
+ if self._operation == Operation.OVERWRITE:
+ if self._parent_snapshot_id is not None:
+ previous_snapshot =
self._table.snapshot_by_id(self._parent_snapshot_id)
+ if previous_snapshot is None:
+ # This should never happen since you cannot overwrite an
empty table
+ raise ValueError(f"Could not find the previous snapshot:
{self._parent_snapshot_id}")
+
+ executor = ExecutorFactory.get_or_create()
+
+ def _get_entries(manifest: ManifestFile) ->
List[ManifestEntry]:
Review Comment:
Should this return an iterator instead of a list? Looks like
`fetch_manifest_entry` returns a list, but we may not need so much copying. Not
sure if that's a concern in Python.
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