deemoliu commented on code in PR #12437:
URL: https://github.com/apache/pinot/pull/12437#discussion_r1514972783


##########
pinot-common/src/main/java/org/apache/pinot/common/function/scalar/StringFunctions.java:
##########
@@ -597,6 +596,39 @@ public static String splitPart(String input, String 
delimiter, int index) {
     }
   }
 
+  /**
+   * @param input the input String to be split into parts.
+   * @param delimiter the specified delimiter to split the input string.
+   * @param index the specified index for the splitted parts to be returned.
+   * @param max the max count of parts that the input string can be splitted 
into.
+   * @return splits string on the delimiter with the limit count and returns 
String at specified index from the split.
+   */
+  @ScalarFunction
+  public static String splitPart(String input, String delimiter, int index, 
int max) {
+    String[] splitString = StringUtils.splitByWholeSeparator(input, delimiter, 
max);

Review Comment:
   Thanks for review @satishd 
   I think the current behavior is to return a invalid value "null" instead of 
error and stop ingestion.
   I also think that "null" value is not a good indicator to differentiate 
different kinds of invalid values, but it might need a discussion with OSS 
since it's a backward incompatible change since this is already used in many 
existing UDFs (e.g. line 594-596).



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