Fokko commented on code in PR #3149:
URL: https://github.com/apache/iceberg-python/pull/3149#discussion_r3000066172
##########
pyiceberg/table/__init__.py:
##########
@@ -542,12 +542,69 @@ def dynamic_partition_overwrite(
)
)
- partitions_to_overwrite = {data_file.partition for data_file in
data_files}
- delete_filter = self._build_partition_predicate(
- partition_records=partitions_to_overwrite,
spec=self.table_metadata.spec(), schema=self.table_metadata.schema()
- )
- self.delete(delete_filter=delete_filter,
snapshot_properties=snapshot_properties, branch=branch)
+ # partitions_to_overwrite = {data_file.partition for data_file in
data_files}
+ # delete_filter = self._build_partition_predicate(
+ # partition_records=partitions_to_overwrite,
spec=self.table_metadata.spec(), schema=self.table_metadata.schema()
+ # )
+ # self.delete(delete_filter=delete_filter,
snapshot_properties=snapshot_properties, branch=branch)
+
+ # Build the partition predicate per-spec to handle tables that have
+ # undergone partition spec evolution. Manifests in the snapshot may be
+ # written under different (older) specs. We need to project the
overwrite
+ # partitions into each historical spec's coordinate space so that the
+ # manifest evaluator correctly identifies which old manifests to
delete.
+ current_spec = self.table_metadata.spec()
+ current_schema = self.table_metadata.schema()
+ # Collect the source column names (e.g. "category") that are being
+ # overwritten — these are stable across spec evolution (only field IDs
matter).
+ overwrite_source_ids = {field.source_id for field in
current_spec.fields}
+
+ delete_filter: BooleanExpression = AlwaysFalse()
+
+ # For each historical spec in the snapshot, build a predicate using
+ # only the fields that spec knows about, matched against the
+ # corresponding positions in the new data files' partition records.
+ snapshot = self.table_metadata.snapshot_by_name(branch or MAIN_BRANCH)
+ if snapshot is not None:
+ spec_ids_in_snapshot = {m.partition_spec_id for m in
snapshot.manifests(io=self._table.io)}
Review Comment:
Also, iterating over the manifests is pretty expensive. Do we need to do
that upfront?
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