uros-db commented on code in PR #45856:
URL: https://github.com/apache/spark/pull/45856#discussion_r1552938423


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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala:
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@@ -543,25 +543,40 @@ 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)

Review Comment:
   what does it mean for "regex" to be of type `StringTypeAnyCollation`, as it 
doesn't seem to me that collation is respected/needed for this parameter to 
begin with? for example, consider: `[,]` with UNICODE_CI collation



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