vladimirg-db commented on code in PR #46097:
URL: https://github.com/apache/spark/pull/46097#discussion_r1568379265


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common/unsafe/src/test/java/org/apache/spark/unsafe/types/CollationSupportSuite.java:
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@@ -101,6 +101,9 @@ public void testContains() throws SparkException {
     assertContains("ab世De", "AB世dE", "UNICODE_CI", true);
     assertContains("äbćδe", "ÄbćδE", "UNICODE_CI", true);
     assertContains("äbćδe", "ÄBcΔÉ", "UNICODE_CI", false);
+    // Case-variable character length

Review Comment:
   Actually, do you maybe wanna add a test case for `'ß'.upper() == 'SS'`? 
Since it's a general CI, and not LCASE collation.



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