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Delta files are just parquet files. So you can ingest using druid batch ingestion. Delta files usually have a manifest file that list the files that have been changed in upsert operations. So the usually approach is to periodically ingest using the latest manifest. However in your case you probably want to ingest all the files. The main issue I see is that you will have duplicate data as updates are not possible in druid at present. You will need to use latest/earliest in your ingestion and in your queries to handle that