PartitionedDeltaWriter
class PartitionedDeltaWriter(table: Table, spec: PartitionSpec, format: FileFormat, writerFactory: GenericFileWriterFactory, outputFileFactory: OutputFileFactory, io: FileIO, targetFileSize: Long, schema: Schema, identifierFieldIds: Set<Int>) : BaseDeltaTaskWriter(source)
BaseDeltaTaskWriter implementation that handles delta (insert, update, delete) writes to a partitioned Iceberg org.apache.iceberg.Table.