Kinigopoulos commented on issue #11267:
URL: https://github.com/apache/druid/issues/11267#issuecomment-842913033
@FrankChen021 thanks for the reply.
My plan was to follow the moving average as an example but it does not
contain any implementation for RunnerFactory so it doesn't process the segments
itself (although I wouldn't mind taking the data from a groupBy query and edit
them from there) but also has that issue (#11266) with ClassCastException
The NPE is being thrown by the Druid code:
```
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:229)
at org.apache.druid.query.Query.getMostSpecificId(Query.java:172)
at
org.apache.druid.client.CachingClusteredClient.initializeNumRemainingResponsesInResponseContext(CachingClusteredClient.java:217)
at
org.apache.druid.client.CachingClusteredClient.run(CachingClusteredClient.java:205)
at
org.apache.druid.client.CachingClusteredClient.access$100(CachingClusteredClient.java:116)
at
org.apache.druid.client.CachingClusteredClient$2.run(CachingClusteredClient.java:187)
at
org.apache.druid.query.RetryQueryRunner.run(RetryQueryRunner.java:108)
at
org.apache.druid.server.SetAndVerifyContextQueryRunner.run(SetAndVerifyContextQueryRunner.java:51)
at org.apache.druid.query.UnionQueryRunner.run(UnionQueryRunner.java:92)
at
org.apache.druid.query.ResultMergeQueryRunner.doRun(ResultMergeQueryRunner.java:58)
at
org.apache.druid.query.BySegmentSkippingQueryRunner.run(BySegmentSkippingQueryRunner.java:46)
at
org.apache.druid.query.FinalizeResultsQueryRunner.run(FinalizeResultsQueryRunner.java:110)
at
org.apache.druid.query.CPUTimeMetricQueryRunner.run(CPUTimeMetricQueryRunner.java:65)
at
org.apache.druid.query.ResultLevelCachingQueryRunner.run(ResultLevelCachingQueryRunner.java:158)
at
org.apache.druid.query.FluentQueryRunnerBuilder$FluentQueryRunner.run(FluentQueryRunnerBuilder.java:55)
at
org.apache.druid.server.ClientQuerySegmentWalker$QuerySwappingQueryRunner.run(ClientQuerySegmentWalker.java:511)
at org.apache.druid.query.QueryRunner.run(QueryRunner.java:38)
```
If I include this piece of code below in QueryToolChest, then the query runs
with no errors and returns an empty result but no runners are getting created
from the RunnerFactory so basically the problem isn't resolved.
```
@Override
public QueryRunner<MapBasedRow> mergeResults(QueryRunner<Row> runner) {
return (queryPlus, responseContext) -> {
return Sequences.empty();
};
}
```
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