THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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When we express a query over a Druid table, Hive tries to rewrite the query to be executed efficiently by pushing as much computation as possible to Druid. This task is accomplished by the cost optimizer based in Calcite Apache Calcite, which identifies patterns in the plan and apply rules to rewrite the input query into a new equivalent query with (hopefully) more operations executed in Druid.
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