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@swatifunde - you could accomplish this using a child pipeline with the Select snap to get a count of null values and create a triggered task for it. Then call that triggered task via REST Get snap using pagination to continue calling until you get the response you want (i.e. Not Null) before completing the rest of the steps to load the data. Note that the REST Get will return documents even for null counts so you need to do something with that output - perhaps a Filter, Router, or Tail snap.
Have you tried the Group By N snap?
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