uros-db commented on code in PR #46511:
URL: https://github.com/apache/spark/pull/46511#discussion_r1600495650


##########
common/unsafe/src/main/java/org/apache/spark/sql/catalyst/util/CollationAwareUTF8String.java:
##########
@@ -183,6 +204,19 @@ public static int findInSet(final UTF8String match, final 
UTF8String set, int co
     return 0;
   }
 
+  public static int lowercaseIndexOf(final UTF8String target, final UTF8String 
pattern,
+      final int start) {
+    if (pattern.numChars() == 0) return 0;

Review Comment:
   why do you think it would not be expected? `indexOf` uses 0-based index
   
   - -1 means "not found"
   - 0 means "found at beginning"
   
   an empty pattern string is (by definition) found at the beginning of any 
given target string
   I don't think there are any issues there - seems pretty expected to me



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