ArrayType(ArrayType(DoubleType,true),true) Not Supported When Writing Dataframe to TFRecords

Hi, I try to write my dataframe to tfrecords but encounter the error, log is as below

Caused by: java.lang.RuntimeException: Cannot convert field to unsupported data type ArrayType(ArrayType(DoubleType,true),true) at org.tensorflow.spark.datasources.tfrecords.serde.DefaultTfRecordRowEncoder$.org$tensorflow$spark$datasources$tfrecords$serde$DefaultTfRecordRowEncoder$$encodeFeature(DefaultTfRecordRowEncoder.scala:144) at org.tensorflow.spark.datasources.tfrecords.serde.DefaultTfRecordRowEncoder$$anonfun$encodeExample$1.apply(DefaultTfRecordRowEncoder.scala:64) at org.tensorflow.spark.datasources.tfrecords.serde.DefaultTfRecordRowEncoder$$anonfun$encodeExample$1.apply(DefaultTfRecordRowEncoder.scala:61) at scala.collection.immutable.List.foreach(List.scala:392) at org.tensorflow.spark.datasources.tfrecords.serde.DefaultTfRecordRowEncoder$.encodeExample(DefaultTfRecordRowEncoder.scala:61) at org.tensorflow.spark.datasources.tfrecords.DefaultSource$$anonfun$2.apply(DefaultSource.scala:59) at org.tensorflow.spark.datasources.tfrecords.DefaultSource$$anonfun$2.apply(DefaultSource.scala:56) at scala.collection.Iterator$$anon$11.next(Iterator.scala:410) at org.apache.spark.internal.io.SparkHadoopWriter$$anonfun$4.apply(SparkHadoopWriter.scala:129) at org.apache.spark.internal.io.SparkHadoopWriter$$anonfun$4.apply(SparkHadoopWriter.scala:127) at org.apache.spark.util.Utils$.tryWithSafeFinallyAndFailureCallbacks(Utils.scala:1394) at org.apache.spark.internal.io.SparkHadoopWriter$.org$apache$spark$internal$io$SparkHadoopWriter$$executeTask(SparkHadoopWriter.scala:139) ... 10 more

I presume such feature is already supported though it's not specifically addressed in README

Start in DefaultTfRecordRowEncoder.scala, especially encodeFeature at line 144 and encodeExample at lines 61-64, where the unsupported nested ArrayType is rejected. Review the README's supported types and determine the expected TFRecord representation for ArrayType(ArrayType(DoubleType,true),true). Done means writing the reported dataframe no longer fails for this type.