case object PackedRowWriterFactory extends StreamingDataWriterFactory with Product with Serializable
A simple org.apache.spark.sql.connector.write.DataWriterFactory whose tasks just pack rows into the commit message for delivery to a org.apache.spark.sql.connector.write.BatchWrite on the driver.
Note that, because it sends all rows to the driver, this factory will generally be unsuitable for production-quality sinks. It's intended for use in tests.
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(Since version 9)