pzhdfy opened a new pull request #7594: [for master] general exactly count distinct support in Druid URL: https://github.com/apache/incubator-druid/pull/7594 The detailed design and discussion is in issue https://github.com/apache/incubator-druid/issues/6716 **Target** support general exactly count distinct in Druid **Attention** the pr is for branch master, pr for 0.12.x is here(https://github.com/apache/incubator-druid/pull/7582) **Usage** 1. configure to use extension druid-uniq: druid.extensions.loadList=[...,"druid-uniq"] 2. define a unique metric in metricsSpec at Ingestion time ` "metricsSpec": [ { "type": "count", "name": "count" }, { "name": "author_id_distinct", "type": "unique", "fieldName": "author_id" } ],` 3. define a unique metric in aggregations at query time `{ "queryType": "timeseries", "postAggregations": [], "granularity": "ALL", "dataSource": "druid_hadoop_task_example", "intervals": "2018-04-24T00:00:00+08:00/2018-04-26T00:00:00+08:00", "aggregations": [ { "name": "count", "type": "count" }, { "name": "author_id_distinct", "type": "unique", "fieldName": "author_id_distinct" } ] }`
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