Github user tcondie commented on a diff in the pull request:
https://github.com/apache/spark/pull/15626#discussion_r85609921
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/CompactibleFileStreamLog.scala
---
@@ -37,14 +39,19 @@ import org.apache.spark.sql.SparkSession
* compact log files every 10 batches by default into a big file. When
* doing a compaction, it will read all old log files and merge them with
the new batch.
*/
-abstract class CompactibleFileStreamLog[T: ClassTag](
+abstract class CompactibleFileStreamLog[T <: AnyRef : ClassTag](
--- End diff --
It's required by json4s that T be an AnyRef.
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