cloud-fan commented on code in PR #49772:
URL: https://github.com/apache/spark/pull/49772#discussion_r1951988840


##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/ResolveDDLCommandStringTypes.scala:
##########
@@ -155,22 +123,22 @@ object ResolveDefaultStringTypes extends 
Rule[LogicalPlan] {
     dataType.existsRecursively(isDefaultStringType)
 
   private def isDefaultStringType(dataType: DataType): Boolean = {
+    // STRING (without explicit collation) is considered default string type.
+    // STRING COLLATE <collation_name> (with explicit collation) is not 
considered
+    // default string type even when explicit collation is UTF8_BINARY 
(default collation).
     dataType match {
-      case st: StringType =>
-        // should only return true for StringType object and not 
StringType("UTF8_BINARY")
-        st.eq(StringType) || st.isInstanceOf[TemporaryStringType]
+      // should only return true for StringType object and not for 
StringType("UTF8_BINARY")
+      case st: StringType => st.eq(StringType)

Review Comment:
   This is exactly the same as `case StringType => true`



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