cloud-fan commented on code in PR #46077:
URL: https://github.com/apache/spark/pull/46077#discussion_r1577451945


##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala:
##########
@@ -543,25 +555,29 @@ case class RLike(left: Expression, right: Expression) 
extends StringRegexExpress
 case class StringSplit(str: Expression, regex: Expression, limit: Expression)
   extends TernaryExpression with ImplicitCastInputTypes with NullIntolerant {
 
-  override def dataType: DataType = ArrayType(StringType, containsNull = false)
-  override def inputTypes: Seq[DataType] = Seq(StringType, StringType, 
IntegerType)
+  override def dataType: DataType = ArrayType(str.dataType, containsNull = 
false)
+  override def inputTypes: Seq[AbstractDataType] =
+    Seq(StringTypeBinaryLcase, StringTypeAnyCollation, IntegerType)
   override def first: Expression = str
   override def second: Expression = regex
   override def third: Expression = limit
 
+  final lazy val collationId: Int = 
str.dataType.asInstanceOf[StringType].collationId
+
   def this(exp: Expression, regex: Expression) = this(exp, regex, Literal(-1))
 
   override def nullSafeEval(string: Any, regex: Any, limit: Any): Any = {
-    val strings = string.asInstanceOf[UTF8String].split(
-      regex.asInstanceOf[UTF8String], limit.asInstanceOf[Int])
+    val pattern = 
CollationSupport.collationAwareRegex(regex.asInstanceOf[UTF8String], 
collationId)
+    val strings = string.asInstanceOf[UTF8String].split(pattern, 
limit.asInstanceOf[Int])
     new GenericArrayData(strings.asInstanceOf[Array[Any]])
   }
 
   override def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
     val arrayClass = classOf[GenericArrayData].getName
     nullSafeCodeGen(ctx, ev, (str, regex, limit) => {
       // Array in java is covariant, so we don't need to cast UTF8String[] to 
Object[].
-      s"""${ev.value} = new 
$arrayClass($str.split($regex,$limit));""".stripMargin
+      s"""${ev.value} = new $arrayClass($str.split(

Review Comment:
   this doesn't seem to match the interpreted version.



##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala:
##########
@@ -543,25 +555,29 @@ case class RLike(left: Expression, right: Expression) 
extends StringRegexExpress
 case class StringSplit(str: Expression, regex: Expression, limit: Expression)
   extends TernaryExpression with ImplicitCastInputTypes with NullIntolerant {
 
-  override def dataType: DataType = ArrayType(StringType, containsNull = false)
-  override def inputTypes: Seq[DataType] = Seq(StringType, StringType, 
IntegerType)
+  override def dataType: DataType = ArrayType(str.dataType, containsNull = 
false)
+  override def inputTypes: Seq[AbstractDataType] =
+    Seq(StringTypeBinaryLcase, StringTypeAnyCollation, IntegerType)
   override def first: Expression = str
   override def second: Expression = regex
   override def third: Expression = limit
 
+  final lazy val collationId: Int = 
str.dataType.asInstanceOf[StringType].collationId
+
   def this(exp: Expression, regex: Expression) = this(exp, regex, Literal(-1))
 
   override def nullSafeEval(string: Any, regex: Any, limit: Any): Any = {
-    val strings = string.asInstanceOf[UTF8String].split(
-      regex.asInstanceOf[UTF8String], limit.asInstanceOf[Int])
+    val pattern = 
CollationSupport.collationAwareRegex(regex.asInstanceOf[UTF8String], 
collationId)
+    val strings = string.asInstanceOf[UTF8String].split(pattern, 
limit.asInstanceOf[Int])
     new GenericArrayData(strings.asInstanceOf[Array[Any]])
   }
 
   override def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
     val arrayClass = classOf[GenericArrayData].getName
     nullSafeCodeGen(ctx, ev, (str, regex, limit) => {
       // Array in java is covariant, so we don't need to cast UTF8String[] to 
Object[].
-      s"""${ev.value} = new 
$arrayClass($str.split($regex,$limit));""".stripMargin
+      s"""${ev.value} = new $arrayClass($str.split(

Review Comment:
   this doesn't seem to match the interpreted version.



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