glasser commented on issue #5789: Add stringLast and stringFirst aggregators extension URL: https://github.com/apache/incubator-druid/pull/5789#issuecomment-472135189 Yeah, running this task against a fresh download of 0.13-incubating succeeds, even though I would think it would need to invoke AggregateCombiner? ``` { "type" : "index", "spec" : { "dataSchema" : { "dataSource" : "wikipedia", "parser" : { "type" : "string", "parseSpec" : { "format" : "json", "dimensionsSpec" : { "dimensions" : [ "cityName", "comment", "countryIsoCode", "countryName", "isAnonymous", "isMinor", "isNew", "isRobot", "isUnpatrolled", "metroCode", "namespace", "page", "regionIsoCode", "regionName", "user", { "name": "added", "type": "long" }, { "name": "deleted", "type": "long" }, { "name": "delta", "type": "long" } ] }, "timestampSpec": { "column": "time", "format": "iso" } } }, "metricsSpec": [{ "name": "channel", "fieldName": "channel", "type": "stringFirst", "maxStringBytes": 100 }], "granularitySpec" : { "type" : "uniform", "segmentGranularity" : "day", "queryGranularity" : "none", "intervals" : ["2015-09-12/2015-09-13"], "rollup" : false } }, "ioConfig" : { "type" : "index", "firehose" : { "type" : "local", "baseDir" : "quickstart/tutorial/", "filter" : "wikiticker-2015-09-12-sampled.json.gz" }, "appendToExisting" : false }, "tuningConfig" : { "type" : "index", "targetPartitionSize" : 5000000, "maxRowsInMemory" : 1000, "forceExtendableShardSpecs" : true } } } ```
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