rdblue commented on code in PR #61:
URL: https://github.com/apache/iceberg-python/pull/61#discussion_r1416461866
##########
pyiceberg/table/snapshots.py:
##########
@@ -116,3 +168,193 @@ class MetadataLogEntry(IcebergBaseModel):
class SnapshotLogEntry(IcebergBaseModel):
snapshot_id: int = Field(alias="snapshot-id")
timestamp_ms: int = Field(alias="timestamp-ms")
+
+
+class SnapshotSummaryCollector:
+ added_size: int
+ removed_size: int
+ added_files: int
+ removed_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_size = 0
+ self.removed_size = 0
+ self.added_files = 0
+ self.removed_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_size += data_file.file_size_in_bytes
+
+ if data_file.content == DataFileContent.DATA:
+ self.added_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_size += data_file.file_size_in_bytes
+
+ if data_file.content == DataFileContent.DATA:
+ self.removed_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 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_size, ADDED_FILE_SIZE)
+ set_when_positive(properties, self.removed_size, REMOVED_FILE_SIZE)
+ set_when_positive(properties, self.added_files, ADDED_DATA_FILES)
+ set_when_positive(properties, self.removed_files, DELETED_DATA_FILES)
+ set_when_positive(properties, self.added_eq_delete_files,
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
+
+
+def _truncate_table_summary(summary: Summary, previous_summary: Mapping[str,
str]) -> Summary:
+ for prop in {
+ TOTAL_DATA_FILES,
+ TOTAL_DELETE_FILES,
+ TOTAL_RECORDS,
+ TOTAL_FILE_SIZE,
+ TOTAL_POSITION_DELETES,
+ TOTAL_EQUALITY_DELETES,
+ }:
+ summary[prop] = '0'
+
+ if value := previous_summary.get(TOTAL_DATA_FILES):
+ summary[DELETED_DATA_FILES] = value
+ if value := previous_summary.get(TOTAL_DELETE_FILES):
+ summary[REMOVED_DELETE_FILES] = value
+ if value := previous_summary.get(TOTAL_RECORDS):
+ summary[DELETED_RECORDS] = value
+ if value := previous_summary.get(TOTAL_FILE_SIZE):
+ summary[REMOVED_FILE_SIZE] = value
+ if value := previous_summary.get(TOTAL_POSITION_DELETES):
+ summary[REMOVED_POSITION_DELETES] = value
+ if value := previous_summary.get(TOTAL_EQUALITY_DELETES):
+ summary[REMOVED_EQUALITY_DELETES] = value
+
+ return summary
+
+
+def _merge_snapshot_summaries(
Review Comment:
Is this really a merge? To me, a merge is like adding two summaries
together. This is actually updating from a previous snapshot summary.
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