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It sounds like you are referring to the datacube/dashboard visualization layer in Imply Pivot? That is not part of OSS Druid. Otherwise, "views" as in relational DB views, are not a Druid feature either. You can, however create and refresh "summary" datasources fairly easily in Druid using the new MSQ SQL Ingestion engine: https://druid.apache.org/docs/latest/multi-stage-query/index.html

if "views" here refer to https://docs.imply.io/latest/druid/operations/views/view-manager/. then yes, they are not available in OS druid.