ulysses-you commented on a change in pull request #29244:
URL: https://github.com/apache/spark/pull/29244#discussion_r460660781
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File path: sql/catalyst/src/main/scala/org/apache/spark/sql/types/NullType.scala
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@@ -32,6 +32,8 @@ class NullType private() extends DataType {
override def defaultSize: Int = 1
private[spark] override def asNullable: NullType = this
+
+ override def sql: String = "VOID"
Review comment:
Just consider that simpleString/catalogString is a name of spark, and
sql is used in other database ? We can still show something like `unknown` with
`NullType`, If we can divide this.
I'm not sure the sql original meaning, but it seems used for Hive DDL e.g.,
`StructType.toDDL` use sql to build DDL string.
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