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How To Use tstats with nested data models - getting empty results

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I have a DataModel named "AccessLogs" and it has a DataSet hierarchy that looks like this RootSearchDS // sourcetype=http_access_log BusinessHoursDS // Child of RootSearchDS, Some filtering to only include Mon-Fri work hours BetaDS // Child of BusinessHoursDS, host=BetaServer* ProdDS // Child of BusinessHoursDS, host=ProdServer* I've enabled the DataModel to be publicly available and I've enabled acceleration for 1 day. Now, I'm trying to use the tstats function to return some results about my DataSets. I'm running queries over around 1-2 Terrabytes of data collected over 3 months. The normal pivots are very slow - a few hours to run - so I was hoping the tstats function would provide a faster alternative. I just need basic stats on my DataSets - like avg values segmented by week of the year. Here's my tstats command: | tstats count avg(ResponseTimeMillis) as "AvgResponse" FROM datamodel=AccessLogs.RootSearchDS WHERE nodename=RootSearchDS.BusinessHoursDS.BetaDS by TimeWeekOfYear I can see the count field is populated with data but the AvgResponse field is always blank. It looks like this field doesn't exist. But when I pivot off my data model AccessLogs > RootSearch > BusHours > Beta I can see that the ResponseTimeMillis field does exist. Anyone know why the avg(ResponseTimeMillis) might be blank? Did I specify my "datamodel" and "nodename" parameters correctly? Does ResponseTimeMillis need to be set as a "required" field in my DataSet?

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