test: dummy test without rollover

pyiceberg/manifest.py

@@ -858,6 +858,7 @@ def _get_current_writer(self) -> ManifestWriter:
             return self._current_writer
         if self._should_roll_to_new_file():
             self._close_current_writer()
+            return self._get_current_writer()
         return self._current_writer
 
     def _should_roll_to_new_file(self) -> bool:
@@ -885,6 +886,7 @@ def add_entry(self, entry: ManifestEntry) -> RollingManifestWriter:
         if self._closed:
             raise RuntimeError("Cannot add entry to closed manifest writer")
         self._get_current_writer().add_entry(entry)
+        self._current_file_rows += entry.data_file.record_count
         return self
 
 

tests/utils/test_manifest.py

@@ -31,6 +31,7 @@
     ManifestEntryStatus,
     ManifestFile,
     PartitionFieldSummary,
+    RollingManifestWriter,
     read_manifest_list,
     write_manifest,
     write_manifest_list,
@@ -476,6 +477,184 @@ def test_write_manifest(
         assert data_file.sort_order_id == 0
 
 
+@pytest.mark.parametrize("format_version", [1, 2])
+def test_rolling_manifest_writer(
+    generated_manifest_file_file_v1: str, generated_manifest_file_file_v2: str, format_version: TableVersion
+) -> None:
+    io = load_file_io()
+    snapshot = Snapshot(
+        snapshot_id=25,
+        parent_snapshot_id=19,
+        timestamp_ms=1602638573590,
+        manifest_list=generated_manifest_file_file_v1 if format_version == 1 else generated_manifest_file_file_v2,
+        summary=Summary(Operation.APPEND),
+        schema_id=3,
+    )
+    demo_manifest_file = snapshot.manifests(io)[0]
+    manifest_entries = demo_manifest_file.fetch_manifest_entry(io)
+    test_schema = Schema(
+        NestedField(1, "VendorID", IntegerType(), False), NestedField(2, "tpep_pickup_datetime", IntegerType(), False)
+    )
+    test_spec = PartitionSpec(
+        PartitionField(source_id=1, field_id=1, transform=IdentityTransform(), name="VendorID"),
+        PartitionField(source_id=2, field_id=2, transform=IdentityTransform(), name="tpep_pickup_datetime"),
+        spec_id=demo_manifest_file.partition_spec_id,
+    )
+    with TemporaryDirectory() as tmpdir:
+        tmp_avro_file = tmpdir + "/test_write_manifest.avro"
+        tmp_avro_file = tmpdir + "/test_write_manifest-1.avro"
+        output = io.new_output(tmp_avro_file)
+        def supplier():
+            i = 0
+            while True:
+                i += 1
+                tmp_avro_file = tmpdir + f"/test_write_manifest-{i}.avro"
+                output = io.new_output(tmp_avro_file)
+                yield write_manifest(
+                    format_version=format_version,
+                    spec=test_spec,
+                    schema=test_schema,
+                    output_file=output,
+                    snapshot_id=8744736658442914487,
+                )
+        with RollingManifestWriter(supplier=supplier(), target_file_size_in_bytes=388872 + 1, target_number_of_rows=20000) as writer:
+            for entry in manifest_entries:
+                writer.add_entry(entry)
+            new_manifest = writer.to_manifest_files()[0]
+            with pytest.raises(RuntimeError):
+                # It is already closed
+                writer.add_entry(manifest_entries[0])
+
+        expected_metadata = {
+            "schema": test_schema.model_dump_json(),
+            "partition-spec": test_spec.model_dump_json(),
+            "partition-spec-id": str(test_spec.spec_id),
+            "format-version": str(format_version),
+        }
+        _verify_metadata_with_fastavro(
+            tmp_avro_file,
+            expected_metadata,
+        )
+        new_manifest_entries = new_manifest.fetch_manifest_entry(io)
+
+        manifest_entry = new_manifest_entries[0]
+
+        assert manifest_entry.status == ManifestEntryStatus.ADDED
+        assert manifest_entry.snapshot_id == 8744736658442914487
+        assert manifest_entry.data_sequence_number == -1 if format_version == 1 else 3
+        assert isinstance(manifest_entry.data_file, DataFile)
+
+        data_file = manifest_entry.data_file
+
+        assert data_file.content is DataFileContent.DATA
+        assert (
+            data_file.file_path
+            == "/home/iceberg/warehouse/nyc/taxis_partitioned/data/VendorID=null/00000-633-d8a4223e-dc97-45a1-86e1-adaba6e8abd7-00001.parquet"
+        )
+        assert data_file.file_format == FileFormat.PARQUET
+        assert data_file.partition == Record(VendorID=1, tpep_pickup_datetime=1925)
+        assert data_file.record_count == 19513
+        assert data_file.file_size_in_bytes == 388872
+        assert data_file.column_sizes == {
+            1: 53,
+            2: 98153,
+            3: 98693,
+            4: 53,
+            5: 53,
+            6: 53,
+            7: 17425,
+            8: 18528,
+            9: 53,
+            10: 44788,
+            11: 35571,
+            12: 53,
+            13: 1243,
+            14: 2355,
+            15: 12750,
+            16: 4029,
+            17: 110,
+            18: 47194,
+            19: 2948,
+        }
+        assert data_file.value_counts == {
+            1: 19513,
+            2: 19513,
+            3: 19513,
+            4: 19513,
+            5: 19513,
+            6: 19513,
+            7: 19513,
+            8: 19513,
+            9: 19513,
+            10: 19513,
+            11: 19513,
+            12: 19513,
+            13: 19513,
+            14: 19513,
+            15: 19513,
+            16: 19513,
+            17: 19513,
+            18: 19513,
+            19: 19513,
+        }
+        assert data_file.null_value_counts == {
+            1: 19513,
+            2: 0,
+            3: 0,
+            4: 19513,
+            5: 19513,
+            6: 19513,
+            7: 0,
+            8: 0,
+            9: 19513,
+            10: 0,
+            11: 0,
+            12: 19513,
+            13: 0,
+            14: 0,
+            15: 0,
+            16: 0,
+            17: 0,
+            18: 0,
+            19: 0,
+        }
+        assert data_file.nan_value_counts == {16: 0, 17: 0, 18: 0, 19: 0, 10: 0, 11: 0, 12: 0, 13: 0, 14: 0, 15: 0}
+        assert data_file.lower_bounds == {
+            2: b"2020-04-01 00:00",
+            3: b"2020-04-01 00:12",
+            7: b"\x03\x00\x00\x00",
+            8: b"\x01\x00\x00\x00",
+            10: b"\xf6(\\\x8f\xc2\x05S\xc0",
+            11: b"\x00\x00\x00\x00\x00\x00\x00\x00",
+            13: b"\x00\x00\x00\x00\x00\x00\x00\x00",
+            14: b"\x00\x00\x00\x00\x00\x00\xe0\xbf",
+            15: b")\\\x8f\xc2\xf5(\x08\xc0",
+            16: b"\x00\x00\x00\x00\x00\x00\x00\x00",
+            17: b"\x00\x00\x00\x00\x00\x00\x00\x00",
+            18: b"\xf6(\\\x8f\xc2\xc5S\xc0",
+            19: b"\x00\x00\x00\x00\x00\x00\x04\xc0",
+        }
+        assert data_file.upper_bounds == {
+            2: b"2020-04-30 23:5:",
+            3: b"2020-05-01 00:41",
+            7: b"\t\x01\x00\x00",
+            8: b"\t\x01\x00\x00",
+            10: b"\xcd\xcc\xcc\xcc\xcc,_@",
+            11: b"\x1f\x85\xebQ\\\xe2\xfe@",
+            13: b"\x00\x00\x00\x00\x00\x00\x12@",
+            14: b"\x00\x00\x00\x00\x00\x00\xe0?",
+            15: b"q=\n\xd7\xa3\xf01@",
+            16: b"\x00\x00\x00\x00\x00`B@",
+            17: b"333333\xd3?",
+            18: b"\x00\x00\x00\x00\x00\x18b@",
+            19: b"\x00\x00\x00\x00\x00\x00\x04@",
+        }
+        assert data_file.key_metadata is None
+        assert data_file.split_offsets == [4]
+        assert data_file.equality_ids is None
+        assert data_file.sort_order_id == 0
+
+
 @pytest.mark.parametrize("format_version", [1, 2])
 def test_write_manifest_list(
     generated_manifest_file_file_v1: str, generated_manifest_file_file_v2: str, format_version: TableVersion