Fokko commented on code in PR #569:
URL: https://github.com/apache/iceberg-python/pull/569#discussion_r1666868594
##########
pyiceberg/table/__init__.py:
##########
@@ -454,6 +482,74 @@ def overwrite(
for data_file in data_files:
update_snapshot.append_data_file(data_file)
+ def delete(self, delete_filter: Union[str, BooleanExpression],
snapshot_properties: Dict[str, str] = EMPTY_DICT) -> None:
+ if (
+ self.table_metadata.properties.get(TableProperties.DELETE_MODE,
TableProperties.DELETE_MODE_COPY_ON_WRITE)
+ == TableProperties.DELETE_MODE_MERGE_ON_READ
+ ):
+ warnings.warn("Merge on read is not yet supported, falling back to
copy-on-write")
+
+ if isinstance(delete_filter, str):
+ delete_filter = _parse_row_filter(delete_filter)
+
+ with
self.update_snapshot(snapshot_properties=snapshot_properties).delete() as
delete_snapshot:
+ delete_snapshot.delete_by_predicate(delete_filter)
+
+ # Check if there are any files that require an actual rewrite of a
data file
+ if delete_snapshot.rewrites_needed is True:
+ bound_delete_filter = bind(self._table.schema(), delete_filter,
case_sensitive=True)
+ preserve_row_filter =
expression_to_pyarrow(Not(bound_delete_filter))
+
+ files = self._scan(row_filter=delete_filter).plan_files()
+
+ commit_uuid = uuid.uuid4()
+ counter = itertools.count(0)
+
+ replaced_files: List[Tuple[DataFile, List[DataFile]]] = []
+ # This will load the Parquet file into memory, including:
+ # - Filter out the rows based on the delete filter
+ # - Projecting it to the current schema
+ # - Applying the positional deletes if they are there
+ # When writing
+ # - Apply the latest partition-spec
+ # - And sort order when added
+ for original_file in files:
+ df = project_table(
+ tasks=[original_file],
+ table_metadata=self._table.metadata,
+ io=self._table.io,
+ row_filter=AlwaysTrue(),
+ projected_schema=self.table_metadata.schema(),
+ )
+ filtered_df = df.filter(preserve_row_filter)
+
+ # Only rewrite if there are records being deleted
+ if len(df) != len(filtered_df):
Review Comment:
This is on a file basis, so hopefully, that fits into memory. I do think
that iterating over record batches might be an interesting thing to do here.
> Would the intersection of these two lists of files be the ones we would
have to rewrite?
We don't know for sure. If we're looking for `x = 22`, and the upper and
lower bound are `[19, 25]`, then it will match the evaluator, but we're still
not sure if there is a row that matches the predicate until we've gone through
the file.
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