Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/13720#discussion_r68342801
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/command/tables.scala ---
@@ -522,7 +523,7 @@ case class DescribeTableCommand(table: TableIdentifier,
isExtended: Boolean, isF
private def describeSchema(schema: Seq[CatalogColumn], buffer:
ArrayBuffer[Row]): Unit = {
schema.foreach { column =>
- append(buffer, column.name, column.dataType.toLowerCase,
column.comment.orNull)
+ append(buffer, column.name, column.dataType.toLowerCase,
column.comment.getOrElse(""))
--- End diff --
this is a behaviour changing. The result is not only used to display, but
also used as a table to be queried later. I'm not sure it worth. cc @yhuai
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