pdeva opened a new issue #8648: Document how to ingest quantile sketches URL: https://github.com/apache/incubator-druid/issues/8648 ### Affected Version 0.16 ### Description The code [here](https://github.com/apache/incubator-druid/blob/master/extensions-core/datasketches/src/main/java/org/apache/druid/query/aggregation/datasketches/quantiles/DoublesSketchOperations.java) and the docs [here](https://druid.apache.org/docs/latest/development/extensions-core/datasketches-quantiles.html) suggest that prebuilt quantile sketches can be ingested. However, there is no documentation at all on how to define a spec that takes a prebuilt sketch column. How do you define a column that is a bytearray or string which is a prebuilt quantile sketch?
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