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hi @Archana Sabbarapu. The error message in this case may be slightly misleading because you’re specifying a post aggregator

quantilesDoublesSketchToQuantile

and I do see

druid-datasketches

extension in the load list which houses all the sketch-related aggregators and post-aggregators. The error says that you can only have aggregators of those specific types (and no post-aggregators). Going back to your question, are you specifying the post aggregator during ingestion time or query time? I don’t think you can specify them at ingestion time. Also, are

name

and

fieldName

correct? (they seem to have spaces in them). Please see https://druid.apache.org/docs/latest/querying/post-aggregations.html on how to use post aggregators. Hope that helps

Yes. There is no aggregator such as

quantilesDoublesSketchToQuantile

. What made you try that out? is that something we say in the docs?

yes, we have

quantilesDoublesSketchToQuantile

in the post-aggregators section here: https://druid.apache.org/docs/latest/development/extensions-core/datasketches-quantiles.html#quantile

that's a post-aggregator though, not an aggregator.