dbatomic commented on code in PR #45422:
URL: https://github.com/apache/spark/pull/45422#discussion_r1526193615


##########
sql/api/src/main/scala/org/apache/spark/sql/types/StringType.scala:
##########
@@ -40,6 +40,7 @@ class StringType private(val collationId: Int) extends 
AtomicType with Serializa
    * equality and hashing).
    */
   def isBinaryCollation: Boolean = 
CollationFactory.fetchCollation(collationId).isBinaryCollation
+  def isLowercaseCollation: Boolean = collationId == 
CollationFactory.LOWERCASE_COLLATION_ID

Review Comment:
   Can you remove even this guy and push the check into `StringTypeBinaryLcase`?



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