zhangxinyu1 commented on issue #6969: The materialized view returns different results than the base data source URL: https://github.com/apache/incubator-druid/issues/6969#issuecomment-459637412 When use kafka-indexing-service, the base datasource data can be divided into two parts. The one is stored in deep storage, and the other is stored in peon node. Only the data in deep storage (s3) will be used to generate derivative DataSource. Therefore, when you query the base data source, the result is calculated by both the data of derivativeDataSource and the data in peon node. If you query the derivativeDataSource directly, the result is calculated only by the data of derivativeDataSource.
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