Update src/test/resources/systemfunction/src/main/java/sample/Upper.java

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: velo

src/test/resources/systemfunction/src/main/java/sample/Upper.java

@@ -6,11 +6,8 @@
 import com.google.auto.service.AutoService;
 
 /**
- * Returns an array of substrings by splitting the input string based on the given delimiter.
- * If the delimiter is not found in the string, the original string is returned as the only element
- * in the array. If the delimiter is empty, every character in the string is split. If the string or
- * delimiter is null, a null value is returned. If the delimiter is found at the beginning or end of
- * the string, or there are contiguous delimiters, then an empty string is added to the array.
+ * Converts the input string to uppercase.
+ * If the input string is null, a null value is returned.
  */
 @AutoService(AutoRegisterSystemFunction.class)
 public class Upper extends ScalarFunction implements AutoRegisterSystemFunction {