nozjkoitop commented on issue #18258:
URL: https://github.com/apache/druid/issues/18258#issuecomment-3084321142
Hi @icksa, APPROX_QUANTILE_DS works on Quantiles DoublesSketch, not on
KllDoublesSketch which is causing ClassCastException
What you might've been looking for, is the KllDoublesSketch aggregator and
KllDoublesSketchToQuantile post-aggregator, those are not exposed through the
current SQL functions, but you can use native query here, somehow like this:
```
{
"queryType":"timeseries",
"dataSource":{
"type":"table",
"name":"kll_doubles"
},
"intervals":{
"type":"intervals",
"intervals":[
"-146136543-09-08T08:23:32.096Z/146140482-04-24T15:36:27.903Z"
]
},
"granularity":{
"type":"all"
},
"aggregations":[
{
"type":"KllDoublesSketch",
"name":"kll_union",
"fieldName":"kll_sketch",
"k":256,
"maxStreamLength":1000000000
}
],
"postAggregations":[
{
"type":"KllDoublesSketchToQuantile",
"name":"p50",
"field":{
"type":"fieldAccess",
"fieldName":"kll_union"
},
"fraction":0.5
}
],
}
```
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