RestfulBlue commented on issue #5006: No protections for select query
URL: 
https://github.com/apache/incubator-druid/issues/5006#issuecomment-412073339
 
 
   @asdf2014 jdbc its just example, in some places native queryes preferred, as 
sql has some problems.i think every query should have limitations like groupby. 
groupby looks really good query :  disk spilling, limitation applyes to total 
rows count(not per granularity), when timeseries and topn doesnt has this 
restrictions. timeseries with large interval and none granularity - oom, same 
with topn. i think every query should have limitations like groupby

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