KKcorps commented on a change in pull request #8304:
URL: https://github.com/apache/pinot/pull/8304#discussion_r825792598



##########
File path: 
pinot-common/src/main/java/org/apache/pinot/common/function/scalar/DateTimeFunctions.java
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@@ -273,9 +274,23 @@ public static String toDateTime(long millis, String 
pattern, String timezoneId)
    */
   @ScalarFunction
   public static long fromDateTime(String dateTimeString, String pattern) {
+    if (StringUtils.isEmpty(dateTimeString)) {

Review comment:
       Because of Tableau. Suppose a file as date time strings, but some of 
those values are NULL. since pinot doesn't support NULL, we store them as empty 
strings. 
   When someone applies a date transform function on such a column, an error is 
thrown. 
   
   However, the behavious should be a default value returned in those cases (or 
an explicit NULL value)




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