import org.apache.iceberg.types.Types.NestedField._
import org.apache.iceberg.types._
import org.apache.iceberg._


val timestampSchema = new Schema(optional(1, "timestamp", Types.TimestampType.withoutZone()))

val partitionByDate = PartitionSpec.builderFor(timestampSchema).day("timestamp", "date").build

DataFiles.builder(partitionByDate).withPath("/path/to/data-1.parquet").withFileSizeInBytes(0).withRecordCount(0).withPartitionPath("date=2018-06-08").build()