uros-db commented on code in PR #47771:
URL: https://github.com/apache/spark/pull/47771#discussion_r1718710306
##########
common/unsafe/src/main/java/org/apache/spark/sql/catalyst/util/CollationAwareUTF8String.java:
##########
@@ -1267,6 +1268,128 @@ public static UTF8String[] icuSplitSQL(final UTF8String
string, final UTF8String
return strings.toArray(new UTF8String[0]);
}
+ /**
+ * Title casing a string according to a new behaviour. Iterates over the
string and title cases
+ * the first character in each word, and lowercases every other character.
Handles lowercasing
+ * capital Greek letter sigma ('Σ') separately, taking into account if it
should be a small final
+ * Greek sigma ('ς') or small non-final Greek sigma ('σ'). Words are
separated by ASCII
+ * space(\u0020).
+ *
+ * @param target UTF8String to be title cased
+ * @return title cased target
+ */
+ public static UTF8String toTitleCaseICU(UTF8String target) {
+
+ Iterator<Integer> codepointIterator = target.codePointIterator(
+ CodePointIteratorType.CODE_POINT_ITERATOR_MAKE_VALID);
+
+ // Building the title cased target with 'sb'.
+ StringBuilder sb = new StringBuilder();
+ // 'newWord' is true if the current character is the beginning of a word,
false otherwise.
+ boolean newWord = true;
+ // We are maintaining if the current character is preceded by a cased
letter.
+ // This is used when lowercasing capital Greek letter sigma ('Σ'), to
figure out if it should be
+ // lowercased into σ or ς.
+ boolean precededByCasedLetter = false;
+
+ // 'offset' is a byte offset in target's byte array pointing to the
beginning of the character
+ // that we need to process next(this is only actually used in
appendLowerCasedGreekCapitalSigma)
Review Comment:
```suggestion
// 'offset' is a byte offset in target's byte array pointing to the
beginning of the character
// that we need to process next(this is only actually used in
appendLowerCasedGreekCapitalSigma).
```
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