Nested Group By - Can't sum results of inner hyperUnique aggregator

I’m trying to calculate the maximum, minimum, and average number of users per day of the week using a nested group by query. However, I can’t seem to user the longSum, longMin, or longMax aggregators on the results from a hyperUnique aggregator.

This is the exception I’m getting
{
“error”: “Unknown exception”,
“errorMessage”: “Unknown type[class io.druid.hll.HLLCV1]”,
“errorClass”: “io.druid.java.util.common.parsers.ParseException”,
“host”: null
}

``

And here is my query.

{
“queryType”: “groupBy”,
“dataSource”: {
“type”: “query”,
“query”: {
“queryType”: “groupBy”,
“dataSource”: “analytics-data”,
“granularity”: “hour”,
“aggregations”: [{
“type”: “hyperUnique”,
“name”: “visits”,
“fieldName”: “visits”
}, {
“type”: “hyperUnique”,
“name”: “users”,
“fieldName”: “users_count”
}],
“intervals”: [
“2018-03-01T12:00:00.000/2018-03-31T12:30:00.000”
]
}
},
“granularity”: “all”,
“dimensions”: [{
“type”: “extraction”,
“dimension”: “__time”,
“outputName”: “dayOfWeek”,
“extractionFn”: {
“type”: “timeFormat”,
“format”: “EEEE”,
“timeZone”: “America/New_York”,
“locale”: “en-US”
}
}],
“aggregations”: [{
“type”: “count”,
“name”: “rows”
}, {
“type”: “longSum”,
“name”: “total_users_count”,
“fieldName”: “users”
}, {
“type”: “longMin”,
“name”: “minimum_user_count”,
“fieldName”: “users”
}],
“intervals”: [
“2018-03-01T12:00:00.000/2018-03-31T12:30:00.000”
]
}

``