nikolamand-db commented on code in PR #45856:
URL: https://github.com/apache/spark/pull/45856#discussion_r1566339138


##########
sql/core/src/test/scala/org/apache/spark/sql/CollationRegexpExpressionsSuite.scala:
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@@ -116,30 +116,39 @@ class CollationRegexpExpressionsSuite
 
   test("Support StringSplit string expression with collation") {
     // Supported collations
-    case class StringSplitTestCase[R](l: String, r: String, c: String, result: 
R)
+    case class StringSplitTestCase[R](l: String, r: String, c: String, result: 
R, limit: Int = -1)
     val testCases = Seq(
-      StringSplitTestCase("ABC", "[B]", "UTF8_BINARY", Seq("A", "C"))
+      StringSplitTestCase("ABC", "[B]", "UTF8_BINARY", Seq("A", "C")),
+      StringSplitTestCase("ABC", "[b]", "UTF8_BINARY", Seq("ABC")),
+      StringSplitTestCase("ABC", "[b]", "UTF8_BINARY_LCASE", Seq("A", "C")),
+      StringSplitTestCase("AAA", "[a]", "UTF8_BINARY_LCASE", Seq("", "", "", 
"")),
+      StringSplitTestCase("AAA", "[b]", "UTF8_BINARY_LCASE", Seq("AAA")),
+      StringSplitTestCase("aAbB", "[ab]", "UTF8_BINARY_LCASE", Seq("", "", "", 
"", "")),

Review Comment:
   Rewritten tests, please check.



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