bziobrowski commented on code in PR #14298:
URL: https://github.com/apache/pinot/pull/14298#discussion_r1820443353


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pinot-common/src/main/java/org/apache/pinot/common/function/scalar/DateTimeConvert.java:
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@@ -42,36 +51,43 @@ public Object dateTimeConvert(String timeValueStr, String 
inputFormatStr, String
       _inputFormatSpec = new DateTimeFormatSpec(inputFormatStr);
       _outputFormatSpec = new DateTimeFormatSpec(outputFormatStr);
       _granularitySpec = new DateTimeGranularitySpec(outputGranularityStr);
+      _dateTime = new MutableDateTime(0L, DateTimeZone.UTC);
+      _buffer = new StringBuilder();

Review Comment:
   As an implementation detail, I don't think it should go into javadoc. If 
needed I can add some regular comments though. 
   I think it'd be more effective to go through codebase and fix places that 
utilize joda-time inefficiently (e.g. in DateTimeFunctions class) to eradicate 
bad pattern(s).



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