tedyu commented on PR #37952:
URL: https://github.com/apache/spark/pull/37952#issuecomment-1252616217

   If I subclass `UnknownPartitioning` directly, I would get this compilation 
error:
   ```
   [error] 
/nfusr/dev-server/zyu/spark-cassandra-connector/connector/src/main/scala/com/datastax/spark/connector/datasource/CassandraScanBuilder.scala:327:92:
 not enough arguments for constructor UnknownPartitioning: (x$1: 
Int)org.apache.spark.sql.connector.read.partitioning.UnknownPartitioning.
   [error] Unspecified value parameter x$1.
   [error] case class CassandraPartitioning(partitionKeys: Array[String], 
numPartitions: Int) extends UnknownPartitioning {
   [error]                                                                      
                      ^
   [error] one error found
   ```


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