LantaoJin commented on a change in pull request #28833:
URL: https://github.com/apache/spark/pull/28833#discussion_r448170235
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/connector/catalog/CatalogV2Util.scala
##########
@@ -346,4 +346,23 @@ private[sql] object CatalogV2Util {
}
}
}
+
+ def failNullType(dt: DataType): Unit = {
+ def containsNullType(dt: DataType): Boolean = dt match {
+ case ArrayType(et, _) => containsNullType(et)
+ case MapType(kt, vt, _) => containsNullType(kt) || containsNullType(vt)
+ case StructType(fields) => fields.exists(f =>
containsNullType(f.dataType))
+ case _ => dt.isInstanceOf[NullType]
+ }
+ if (containsNullType(dt)) {
+ throw new AnalysisException(
+ "Cannot create tables with VOID type.")
Review comment:
@cloud-fan ask me to use VOID from NULL. Personally I agree to use VOID
even through NullType is a Type but "null" has a literal syntax. Every time
when we see a "null", we need to finger out it's a data type or literal. It's a
little ambiguity. So @cloud-fan also suggests me to change the simpleString of
`NullType` to "void". So make the symbol "null" only be literal.
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