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This seems like a bug. can you create a github issue for this?

It's likely the real error is coming from a data server, possibly a Historical. Could you try checking the Historical logs for more info? If you don't see anything, you might need to enable debug logging on the Historical

indeed the error is from historical and i think its coming from here

java.util.concurrent.ExecutionException: java.lang.NullPointerException
	at org.apache.druid.client.JsonParserIterator.convertException(JsonParserIterator.java:268) ~[druid-server-25.0.0.jar:25.0.0]

no more additional logs in historical i can see only NullPointerException i can see but i am not able to reproduce it in wiki datasource or the same s3 file datasource created in local. the LATEST column is applied on a row where there are 2 distinct values

null and dummy

also with EARLIEST aggregator or LIMIT issue is not seen

@Sachidananda - you can set

debug

to

true

in the query context. That could generate additional logging

let me try