Add partition stats in snapshot summary (apache#521)

* add partition stats in snapshot summary

* clean up

* enhance unit test

* clean up for review

pyiceberg/table/__init__.py

@@ -213,6 +213,9 @@ class TableProperties:
 
     METRICS_MODE_COLUMN_CONF_PREFIX = "write.metadata.metrics.column"
 
+    WRITE_PARTITION_SUMMARY_LIMIT = "write.summary.partition-limit"
+    WRITE_PARTITION_SUMMARY_LIMIT_DEFAULT = 0
+
     DEFAULT_NAME_MAPPING = "schema.name-mapping.default"
     FORMAT_VERSION = "format-version"
     DEFAULT_FORMAT_VERSION = 2
@@ -2628,9 +2631,19 @@ def _write_delete_manifest() -> List[ManifestFile]:
 
     def _summary(self) -> Summary:
         ssc = SnapshotSummaryCollector()
+        partition_summary_limit = int(
+            self._transaction.table_metadata.properties.get(
+                TableProperties.WRITE_PARTITION_SUMMARY_LIMIT, TableProperties.WRITE_PARTITION_SUMMARY_LIMIT_DEFAULT
+            )
+        )
+        ssc.set_partition_summary_limit(partition_summary_limit)
 
         for data_file in self._added_data_files:
-            ssc.add_file(data_file=data_file)
+            ssc.add_file(
+                data_file=data_file,
+                partition_spec=self._transaction.table_metadata.spec(),
+                schema=self._transaction.table_metadata.schema(),
+            )
 
         previous_snapshot = (
             self._transaction.table_metadata.snapshot_by_id(self._parent_snapshot_id)

pyiceberg/table/snapshots.py

@@ -15,19 +15,16 @@
 # specific language governing permissions and limitations
 # under the License.
 import time
+from collections import defaultdict
 from enum import Enum
-from typing import (
-    Any,
-    Dict,
-    List,
-    Mapping,
-    Optional,
-)
+from typing import Any, DefaultDict, Dict, List, Mapping, Optional
 
 from pydantic import Field, PrivateAttr, model_serializer
 
 from pyiceberg.io import FileIO
 from pyiceberg.manifest import DataFile, DataFileContent, ManifestFile, read_manifest_list
+from pyiceberg.partitioning import UNPARTITIONED_PARTITION_SPEC, PartitionSpec
+from pyiceberg.schema import Schema
 from pyiceberg.typedef import IcebergBaseModel
 
 ADDED_DATA_FILES = 'added-data-files'
@@ -52,8 +49,8 @@
 TOTAL_DELETE_FILES = 'total-delete-files'
 TOTAL_RECORDS = 'total-records'
 TOTAL_FILE_SIZE = 'total-files-size'
-
-
+CHANGED_PARTITION_COUNT_PROP = 'changed-partition-count'
+CHANGED_PARTITION_PREFIX = "partitions."
 OPERATION = "operation"
 
 
@@ -77,6 +74,97 @@ def __repr__(self) -> str:
         return f"Operation.{self.name}"
 
 
+class UpdateMetrics:
+    added_file_size: int
+    removed_file_size: int
+    added_data_files: int
+    removed_data_files: int
+    added_eq_delete_files: int
+    removed_eq_delete_files: int
+    added_pos_delete_files: int
+    removed_pos_delete_files: int
+    added_delete_files: int
+    removed_delete_files: int
+    added_records: int
+    deleted_records: int
+    added_pos_deletes: int
+    removed_pos_deletes: int
+    added_eq_deletes: int
+    removed_eq_deletes: int
+
+    def __init__(self) -> None:
+        self.added_file_size = 0
+        self.removed_file_size = 0
+        self.added_data_files = 0
+        self.removed_data_files = 0
+        self.added_eq_delete_files = 0
+        self.removed_eq_delete_files = 0
+        self.added_pos_delete_files = 0
+        self.removed_pos_delete_files = 0
+        self.added_delete_files = 0
+        self.removed_delete_files = 0
+        self.added_records = 0
+        self.deleted_records = 0
+        self.added_pos_deletes = 0
+        self.removed_pos_deletes = 0
+        self.added_eq_deletes = 0
+        self.removed_eq_deletes = 0
+
+    def add_file(self, data_file: DataFile) -> None:
+        self.added_file_size += data_file.file_size_in_bytes
+
+        if data_file.content == DataFileContent.DATA:
+            self.added_data_files += 1
+            self.added_records += data_file.record_count
+        elif data_file.content == DataFileContent.POSITION_DELETES:
+            self.added_delete_files += 1
+            self.added_pos_delete_files += 1
+            self.added_pos_deletes += data_file.record_count
+        elif data_file.content == DataFileContent.EQUALITY_DELETES:
+            self.added_delete_files += 1
+            self.added_eq_delete_files += 1
+            self.added_eq_deletes += data_file.record_count
+        else:
+            raise ValueError(f"Unknown data file content: {data_file.content}")
+
+    def remove_file(self, data_file: DataFile) -> None:
+        self.removed_file_size += data_file.file_size_in_bytes
+
+        if data_file.content == DataFileContent.DATA:
+            self.removed_data_files += 1
+            self.deleted_records += data_file.record_count
+        elif data_file.content == DataFileContent.POSITION_DELETES:
+            self.removed_delete_files += 1
+            self.removed_pos_delete_files += 1
+            self.removed_pos_deletes += data_file.record_count
+        elif data_file.content == DataFileContent.EQUALITY_DELETES:
+            self.removed_delete_files += 1
+            self.removed_eq_delete_files += 1
+            self.removed_eq_deletes += data_file.record_count
+        else:
+            raise ValueError(f"Unknown data file content: {data_file.content}")
+
+    def to_dict(self) -> Dict[str, str]:
+        properties: Dict[str, str] = {}
+        set_when_positive(properties, self.added_file_size, ADDED_FILE_SIZE)
+        set_when_positive(properties, self.removed_file_size, REMOVED_FILE_SIZE)
+        set_when_positive(properties, self.added_data_files, ADDED_DATA_FILES)
+        set_when_positive(properties, self.removed_data_files, DELETED_DATA_FILES)
+        set_when_positive(properties, self.added_eq_delete_files, ADDED_EQUALITY_DELETE_FILES)
+        set_when_positive(properties, self.removed_eq_delete_files, REMOVED_EQUALITY_DELETE_FILES)
+        set_when_positive(properties, self.added_pos_delete_files, ADDED_POSITION_DELETE_FILES)
+        set_when_positive(properties, self.removed_pos_delete_files, REMOVED_POSITION_DELETE_FILES)
+        set_when_positive(properties, self.added_delete_files, ADDED_DELETE_FILES)
+        set_when_positive(properties, self.removed_delete_files, REMOVED_DELETE_FILES)
+        set_when_positive(properties, self.added_records, ADDED_RECORDS)
+        set_when_positive(properties, self.deleted_records, DELETED_RECORDS)
+        set_when_positive(properties, self.added_pos_deletes, ADDED_POSITION_DELETES)
+        set_when_positive(properties, self.removed_pos_deletes, REMOVED_POSITION_DELETES)
+        set_when_positive(properties, self.added_eq_deletes, ADDED_EQUALITY_DELETES)
+        set_when_positive(properties, self.removed_eq_deletes, REMOVED_EQUALITY_DELETES)
+        return properties
+
+
 class Summary(IcebergBaseModel, Mapping[str, str]):
     """A class that stores the summary information for a Snapshot.
 
@@ -172,100 +260,53 @@ class SnapshotLogEntry(IcebergBaseModel):
 
 
 class SnapshotSummaryCollector:
-    added_file_size: int
-    removed_file_size: int
-    added_data_files: int
-    removed_data_files: int
-    added_eq_delete_files: int
-    removed_eq_delete_files: int
-    added_pos_delete_files: int
-    removed_pos_delete_files: int
-    added_delete_files: int
-    removed_delete_files: int
-    added_records: int
-    deleted_records: int
-    added_pos_deletes: int
-    removed_pos_deletes: int
-    added_eq_deletes: int
-    removed_eq_deletes: int
+    metrics: UpdateMetrics
+    partition_metrics: DefaultDict[str, UpdateMetrics]
+    max_changed_partitions_for_summaries: int
 
     def __init__(self) -> None:
-        self.added_file_size = 0
-        self.removed_file_size = 0
-        self.added_data_files = 0
-        self.removed_data_files = 0
-        self.added_eq_delete_files = 0
-        self.removed_eq_delete_files = 0
-        self.added_pos_delete_files = 0
-        self.removed_pos_delete_files = 0
-        self.added_delete_files = 0
-        self.removed_delete_files = 0
-        self.added_records = 0
-        self.deleted_records = 0
-        self.added_pos_deletes = 0
-        self.removed_pos_deletes = 0
-        self.added_eq_deletes = 0
-        self.removed_eq_deletes = 0
-
-    def add_file(self, data_file: DataFile) -> None:
-        self.added_file_size += data_file.file_size_in_bytes
-
-        if data_file.content == DataFileContent.DATA:
-            self.added_data_files += 1
-            self.added_records += data_file.record_count
-        elif data_file.content == DataFileContent.POSITION_DELETES:
-            self.added_delete_files += 1
-            self.added_pos_delete_files += 1
-            self.added_pos_deletes += data_file.record_count
-        elif data_file.content == DataFileContent.EQUALITY_DELETES:
-            self.added_delete_files += 1
-            self.added_eq_delete_files += 1
-            self.added_eq_deletes += data_file.record_count
-        else:
-            raise ValueError(f"Unknown data file content: {data_file.content}")
-
-    def remove_file(self, data_file: DataFile) -> None:
-        self.removed_file_size += data_file.file_size_in_bytes
-
-        if data_file.content == DataFileContent.DATA:
-            self.removed_data_files += 1
-            self.deleted_records += data_file.record_count
-        elif data_file.content == DataFileContent.POSITION_DELETES:
-            self.removed_delete_files += 1
-            self.removed_pos_delete_files += 1
-            self.removed_pos_deletes += data_file.record_count
-        elif data_file.content == DataFileContent.EQUALITY_DELETES:
-            self.removed_delete_files += 1
-            self.removed_eq_delete_files += 1
-            self.removed_eq_deletes += data_file.record_count
+        self.metrics = UpdateMetrics()
+        self.partition_metrics = defaultdict(UpdateMetrics)
+        self.max_changed_partitions_for_summaries = 0
+
+    def set_partition_summary_limit(self, limit: int) -> None:
+        self.max_changed_partitions_for_summaries = limit
+
+    def add_file(self, data_file: DataFile, schema: Schema, partition_spec: PartitionSpec = UNPARTITIONED_PARTITION_SPEC) -> None:
+        self.metrics.add_file(data_file)
+        if len(data_file.partition.record_fields()) != 0:
+            self.update_partition_metrics(partition_spec=partition_spec, file=data_file, is_add_file=True, schema=schema)
+
+    def remove_file(
+        self, data_file: DataFile, schema: Schema, partition_spec: PartitionSpec = UNPARTITIONED_PARTITION_SPEC
+    ) -> None:
+        self.metrics.remove_file(data_file)
+        if len(data_file.partition.record_fields()) != 0:
+            self.update_partition_metrics(partition_spec=partition_spec, file=data_file, is_add_file=False, schema=schema)
+
+    def update_partition_metrics(self, partition_spec: PartitionSpec, file: DataFile, is_add_file: bool, schema: Schema) -> None:
+        partition_path = partition_spec.partition_to_path(file.partition, schema)
+        partition_metrics: UpdateMetrics = self.partition_metrics[partition_path]
+
+        if is_add_file:
+            partition_metrics.add_file(file)
         else:
-            raise ValueError(f"Unknown data file content: {data_file.content}")
+            partition_metrics.remove_file(file)
 
     def build(self) -> Dict[str, str]:
-        def set_when_positive(properties: Dict[str, str], num: int, property_name: str) -> None:
-            if num > 0:
-                properties[property_name] = str(num)
-
-        properties: Dict[str, str] = {}
-        set_when_positive(properties, self.added_file_size, ADDED_FILE_SIZE)
-        set_when_positive(properties, self.removed_file_size, REMOVED_FILE_SIZE)
-        set_when_positive(properties, self.added_data_files, ADDED_DATA_FILES)
-        set_when_positive(properties, self.removed_data_files, DELETED_DATA_FILES)
-        set_when_positive(properties, self.added_eq_delete_files, ADDED_EQUALITY_DELETE_FILES)
-        set_when_positive(properties, self.removed_eq_delete_files, REMOVED_EQUALITY_DELETE_FILES)
-        set_when_positive(properties, self.added_pos_delete_files, ADDED_POSITION_DELETE_FILES)
-        set_when_positive(properties, self.removed_pos_delete_files, REMOVED_POSITION_DELETE_FILES)
-        set_when_positive(properties, self.added_delete_files, ADDED_DELETE_FILES)
-        set_when_positive(properties, self.removed_delete_files, REMOVED_DELETE_FILES)
-        set_when_positive(properties, self.added_records, ADDED_RECORDS)
-        set_when_positive(properties, self.deleted_records, DELETED_RECORDS)
-        set_when_positive(properties, self.added_pos_deletes, ADDED_POSITION_DELETES)
-        set_when_positive(properties, self.removed_pos_deletes, REMOVED_POSITION_DELETES)
-        set_when_positive(properties, self.added_eq_deletes, ADDED_EQUALITY_DELETES)
-        set_when_positive(properties, self.removed_eq_deletes, REMOVED_EQUALITY_DELETES)
+        properties = self.metrics.to_dict()
+        changed_partitions_size = len(self.partition_metrics)
+        set_when_positive(properties, changed_partitions_size, CHANGED_PARTITION_COUNT_PROP)
+        if changed_partitions_size <= self.max_changed_partitions_for_summaries:
+            for partition_path, update_metrics_partition in self.partition_metrics.items():
+                if (summary := self._partition_summary(update_metrics_partition)) and len(summary) != 0:
+                    properties[CHANGED_PARTITION_PREFIX + partition_path] = summary
 
         return properties
 
+    def _partition_summary(self, update_metrics: UpdateMetrics) -> str:
+        return ",".join([f"{prop}={val}" for prop, val in update_metrics.to_dict().items()])
+
 
 def _truncate_table_summary(summary: Summary, previous_summary: Mapping[str, str]) -> Summary:
     for prop in {
@@ -366,3 +407,8 @@ def _update_totals(total_property: str, added_property: str, removed_property: s
     )
 
     return summary
+
+
+def set_when_positive(properties: Dict[str, str], num: int, property_name: str) -> None:
+    if num > 0:
+        properties[property_name] = str(num)

tests/integration/test_writes.py

@@ -525,12 +525,15 @@ def test_summaries_with_only_nulls(
         'total-records': '2',
     }
 
-    assert summaries[0] == {
-        'total-data-files': '0',
-        'total-delete-files': '0',
+    assert summaries[2] == {
+        'removed-files-size': '4239',
         'total-equality-deletes': '0',
-        'total-files-size': '0',
         'total-position-deletes': '0',
+        'deleted-data-files': '1',
+        'total-delete-files': '0',
+        'total-files-size': '0',
+        'deleted-records': '2',
+        'total-data-files': '0',
         'total-records': '0',
     }