HyukjinKwon commented on code in PR #57450:
URL: https://github.com/apache/spark/pull/57450#discussion_r3732221246
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala:
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@@ -969,6 +969,62 @@ case class TryValidateUTF8(input: Expression) extends
RuntimeReplaceable with Im
}
+/**
+ * A function that returns the Unicode normalization of a string.
+ */
+// scalastyle:off
+@ExpressionDescription(
+ usage = """
+ _FUNC_(str[, form]) - Returns the Unicode normalization of `str` using the
normalization `form`.
+ Valid forms are 'NFC' (default), 'NFD', 'NFKC', and 'NFKD'. The form
name is case-insensitive.
+ """,
+ arguments = """
+ Arguments:
+ * str - a string expression to normalize.
+ * form - a string expression giving the normalization form: 'NFC',
'NFD', 'NFKC', or 'NFKD'.
+ If omitted, 'NFC' is used.
+ """,
+ examples = """
+ Examples:
+ > SELECT _FUNC_('fi', 'NFKC');
+ fi
+ """,
+ since = "4.3.0",
Review Comment:
4.4.0? since branch-4.3 is cut out
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