paimon-python/pypaimon/execution/python/write/postpone_bucket.py

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from pypaimon.write.bucket_planning import PostponeBucketPlanning


class PythonPostponeBucketPlanner(PostponeBucketPlanning):
    """Load Python metadata before applying shared bucket calculations."""

    @staticmethod
    def _load_bucket_metadata(table):
        from pypaimon.execution.python.read.table_scan import PythonTableScan
        scan = PythonTableScan(table.new_read_builder().new_scan())._file_scanner()
        manifest_files, _ = scan.manifest_scanner()
        entries = scan.manifest_file_manager.read_entries_parallel(
            manifest_files,
            max_workers=table.options.scan_manifest_parallelism(),
        )

        known = {}
        for entry in entries:
            partition = tuple(entry.partition.values)
            if entry.bucket >= 0 and entry.total_buckets > 0:
                previous = known.get(partition)
                if previous is not None and previous != entry.total_buckets:
                    raise RuntimeError(
                        "Partition {} has different total buckets {} and {}"
                        .format(partition, previous, entry.total_buckets)
                    )
                known[partition] = entry.total_buckets
        return known