uros-db commented on code in PR #45856:
URL: https://github.com/apache/spark/pull/45856#discussion_r1552941872


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sql/core/src/test/scala/org/apache/spark/sql/CollationRegexpExpressionsSuite.scala:
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@@ -165,15 +165,23 @@ class CollationRegexpExpressionsSuite
 
     // Supported collations
     val checks = Seq(
-      CollationTestCase("ABC", "[B]", "UTF8_BINARY", Seq("A", "C"))
+      CollationTestCase("ABC", "[B]", "UTF8_BINARY", Seq("A", "C")),
+      CollationTestCase("ABC", "[b]", "UTF8_BINARY", Seq("ABC")),
+      CollationTestCase("ABC", "[b]", "UTF8_BINARY_LCASE", Seq("A", "C")),
+      CollationTestCase("AAA", "[a]", "UTF8_BINARY_LCASE", Seq("", "", "", 
"")),
+      CollationTestCase("AAA", "[b]", "UTF8_BINARY_LCASE", Seq("AAA")),
+      CollationTestCase("aAbB", "[ab]", "UTF8_BINARY_LCASE", Seq("", "", "", 
"", "")),
+      CollationTestCase("", "", "UTF8_BINARY_LCASE", Seq("")),
+      CollationTestCase("", "[a]", "UTF8_BINARY_LCASE", Seq("")),
+      CollationTestCase("xAxBxaxbx", "[AB]", "UTF8_BINARY_LCASE", Seq("x", 
"x", "x", "x", "x")),
+      CollationTestCase("ABC", "[B]", "UNICODE", Seq("A", "C")),
+      CollationTestCase("ABC", "[b]", "UNICODE", Seq("ABC"))
     )
     checks.foreach(ct =>
       checkEvaluation(prepareStringSplit(ct.s1, ct.s2, ct.collation), 
ct.expectedResult)

Review Comment:
   I think we should consider rewriting `prepareStringSplit` here, as it 
doesn't make much sense to do:
   `val splitByExpr = Literal.create(splitBy, StringType(collationId))` 
considering that **collationAwareSplit** doesn't respect collation for this 
parameter at all
   
   furthermore, consider how casting makes sense in this instance, and whether 
it's needed at all
   



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