在汇总后使用不重复计数时出现Druid错误

Question

我正在尝试获取平均值，为此，我获得了longSum和distinctCount，并使用算术函数来获取该值。但是，由于我在算术中使用distinctCount，因此druid失败并显示500 Error。

任何其他值（最小值，总和，计数）都可以正常工作。 唯一计数的值本身可以工作，并且我可以在表中获取输出。

"aggregations": [
    {
        "fieldNames": [
            "unifiedProjectId"
        ],
        "name": "count_distinct__unifiedProject",
        "type": "cardinality"
    },
    {
        "fieldName": "executionDurationInMinutesPerSite",
        "name": "sum__executionDurationInMinutesPerSite",
        "type": "doubleSum"
    }
]


"postAggregations": [
    {
        "fields": [
            {
                "fieldName": "sum__executionDurationInMinutesPerSite",
                "name": "sum__executionDurationInMinutesPerSite",
                "type": "fieldAccess"
            },
            {
                "fieldName": "count_distinct__unifiedProject",
                "name": "count_distinct__unifiedProject",
                "type": "fieldAccess"
            }
        ],
        "fn": "/",
        "name": "avg_execution_time_per_project",
        "type": "arithmetic"
    }
]