kgyrtkirk opened a new issue, #15538:
URL: https://github.com/apache/druid/issues/15538
<details>
<summary>when resultscache is enabled</summary>
```
cat >> conf/druid/auto/broker/runtime.properties <<EOF
druid.broker.cache.useResultLevelCache=true
druid.broker.cache.populateResultLevelCache=true
EOF
```
A query which may store a sketch in the resultscache:
</details>
```
SELECT TIME_FLOOR(__time, 'P1D') as dayLvl,
dim1,
HLL_SKETCH_ESTIMATE(DS_HLL(hllsketch_dim1,18,'HLL_4'), true),
HLL_SKETCH_ESTIMATE(DS_HLL(DS_HLL(hllsketch_dim1,18,'HLL_4'),18,'HLL_4')
OVER (PARTITION BY dim1), true), 1
FROM
(select * from druid.foo ) ttt
WHERE __time >= '1903-08-02' AND __time <= '2033-08-07'
and dim1 not like '%ikipedia' and l1 > -4
group by 1,2
```
after the first successfull execution (no cache hit) results in:
```
Unknown exception: class [B cannot be cast to class
org.apache.druid.query.aggregation.datasketches.hll.HllSketchHolder ([B is in
module java.base of loader 'bootstrap';
org.apache.druid.query.aggregation.datasketches.hll.HllSketchHolder is in
unnamed module of loader java.net.URLClassLoader @348ad293)
```
note: it could happen with windowing queries; however it can be reproduced
even without that.
workaround could be to disable the usage of the resultscache
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