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-Apache Druid (incubating) can summarize raw data at ingestion time using a process we refer to as "roll-up". Roll-up is a first-level aggregation operation over a selected set of columns that reduces the size of stored segments.
+Apache Druid (incubating) can summarize raw data at ingestion time using a process we refer to as "roll-up". Roll-up is a first-level aggregation operation over a selected set of columns that reduces the size of stored data.
 
 This tutorial will demonstrate the effects of roll-up on an example dataset.