@Evolving public interface Batch
input partitions. Each
InputPartitionrepresents a data split that can be processed by one Spark task. The number of input partitions returned here is the same as the number of RDD partitions this scan outputs.
Scan supports filter pushdown, this Batch is likely configured with a filter
and is responsible for creating splits for that filter, which is not a full scan.
This method will be called only once during a data source scan, to launch one Spark job.