doenis-usk opened a new issue #10293:
URL: https://github.com/apache/druid/issues/10293
### affected version
0.18.1
### Description
I use extension metrics(DataSketches Quantiles Sketch or Approximate
Histogram) with Filtered Aggregator at ingestion time.
When I post a query, I got only `NaN` result.
However, when I use longSum or count metrics with Filtered Aggregator at
ingestion time, I got the numeric result.
#### ingestion spec
For example, I ingest two metrics (1)latency_histogram,
(2)latency_histogram_without_filter and status 200 data exists.
```
{
...
"metricsSpec": [
{
"aggregator": {
"name": "latency_histogram",
"type": "approxHistogramFold",
"filedName": "fe_latency"
},
"type": "filtered",
"filter": {
"type": "selector",
"dimension": "status",
"value": "200"
}
},
{
"name": "latency_histogram_without_filter",
"type": "approxHistogramFold",
"filedName": "fe_latency"
}
]
...
}
```
#### query
When I post below query, latency_histogram is NaN and
latency_histogram_without_filter is numeric result.
```
{
"queryType": "timeseries",
"dataSource": <DATASOURCE>,
"granularity": "minute",
"aggregations": [
{
"type": "approxHistogramFold",
"name": "latency_histogram",
"fieldName": "latency_histogram"
},
{
"type": "approxHistogramFold",
"name": "latency_histogram_without_filter",
"fieldName": "latency_histogram_without_filter"
}
],
"intervals": <INTERVALS>
}
```
```
[
{
"timestamp": "2020-08-16T13:00:00.000Z",
"result": {
"latency_histogram": {
"breaks": [
"Infinity",
"NaN",
"NaN",
"NaN",
"NaN",
"NaN",
"NaN",
"-Infinity"
],
"counts": [
"NaN",
"NaN",
"NaN",
"NaN",
"NaN",
"NaN",
"NaN"
]
},
"latency_histogram_without_filter": {
"breaks": [
-395428.5,
61553,
518534.5,
975516,
1432497.5,
1889479,
2346460.5,
2803442
],
"counts": [
0,
66000.5625,
2844.926513671875,
9.512149810791016,
1,
2,
2
]
}
}
}
]
```
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