LiBinfeng-01 commented on code in PR #49087:
URL: https://github.com/apache/doris/pull/49087#discussion_r2000333237
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fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/functions/executable/StringArithmetic.java:
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@@ -659,6 +666,27 @@ public static Expression space(IntegerLiteral first) {
return new VarcharLiteral(sb.toString());
}
+ /**
+ * split by char by empty string considering emoji
+ * @param first input string to be split
+ * @return ArrayLiteral
+ */
+ public static Expression splitByGrapheme(StringLikeLiteral first) {
+ List<String> result = new ArrayList<>();
+ int length = first.getValue().length();
+ for (int i = 0; i < length; ) {
+ int codePoint = first.getValue().codePointAt(i);
+ int charCount = Character.charCount(codePoint);
+ result.add(first.getValue().substring(i, i + charCount));
Review Comment:
can not do this because castStringLikeLiteral only accept expression as
output, and result can not use List<Expression> type
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