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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