def _inherit_from_manifest()

in pyiceberg/manifest.py [0:0]

• 9 lines of code
• 10 McCabe index (conditional complexity)

def _inherit_from_manifest(entry: ManifestEntry, manifest: ManifestFile) -> ManifestEntry:
    """
    Inherits properties from manifest file.

    The properties that will be inherited are:
    - sequence numbers
    - partition spec id.

    More information about inheriting sequence numbers: https://iceberg.apache.org/spec/#sequence-number-inheritance

    Args:
        entry: The manifest entry.
        manifest: The manifest file.

    Returns:
        The manifest entry with properties inherited.
    """
    # Inherit sequence numbers.
    # The snapshot_id is required in V1, inherit with V2 when null
    if entry.snapshot_id is None:
        entry.snapshot_id = manifest.added_snapshot_id

    # in v1 tables, the sequence number is not persisted and can be safely defaulted to 0
    # in v2 tables, the sequence number should be inherited iff the entry status is ADDED
    if entry.sequence_number is None and (manifest.sequence_number == 0 or entry.status == ManifestEntryStatus.ADDED):
        entry.sequence_number = manifest.sequence_number

    # in v1 tables, the file sequence number is not persisted and can be safely defaulted to 0
    # in v2 tables, the file sequence number should be inherited iff the entry status is ADDED
    if entry.file_sequence_number is None and (manifest.sequence_number == 0 or entry.status == ManifestEntryStatus.ADDED):
        # Only available in V2, always 0 in V1
        entry.file_sequence_number = manifest.sequence_number

    # Inherit partition spec id.
    entry.data_file.spec_id = manifest.partition_spec_id

    return entry