Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/9016#discussion_r41584197 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/columnar/ColumnType.scala --- @@ -34,7 +34,8 @@ import org.apache.spark.unsafe.types.UTF8String * * @tparam JvmType Underlying Java type to represent the elements. */ -private[sql] sealed abstract class ColumnType[JvmType] { +private[sql] +sealed abstract class ColumnType[@specialized(Boolean, Byte, Short, Int, Long) JvmType] { --- End diff -- add float and double too?
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