Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/13070#discussion_r65611638
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/interface.scala
---
@@ -65,8 +85,18 @@ case class CatalogColumn(
// as a string due to issues in converting Hive varchars to and from
SparkSQL strings.
@Nullable dataType: String,
nullable: Boolean = true,
- comment: Option[String] = None)
+ comment: Option[String] = None) {
+
+ override def toString: String = {
+ val output =
+ Seq(s"`$name`",
+ dataType,
+ if (nullable) "NULL" else "NOT NULL",
--- End diff --
Are there some examples we can follow? I'm not sure what's best here, but
`NULL` looks like confusing, at least we should use `NULLABLE`
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