Jackie-Jiang commented on issue #3515:  DATETIMECONVERT udf conversion to 
Simple_Date_Format are 50x slower than conversion to epoch time
URL: 
https://github.com/apache/incubator-pinot/issues/3515#issuecomment-440070199
 
 
   @chenboat Using SDF is always much more expensive because it's stored as 
String comparing to long in EPOCH format. A better approach is using EPOCH for 
the conversion, and then on client side, convert it to SDF if you need result 
in such format.

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