fn plan_region_batches(
combined_batch: RecordBatch,
physical_table_id: TableId,
partition_rule: &dyn PartitionRule,
partition_columns: &[String],
) -> Result<Vec<PlannedRegionBatch>>fn plan_region_batches(
combined_batch: RecordBatch,
physical_table_id: TableId,
partition_rule: &dyn PartitionRule,
partition_columns: &[String],
) -> Result<Vec<PlannedRegionBatch>>