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Update datasketches-hll.md (#12010) 

under "Aggregators", about the lgK setting, it said "Must be a power of 2 from 4 to 21 inclusively."  21 is not a power of 2, nor is 12, the given default.  I think there may have been confusion because lgK represents log2 of K.  We could say "K must be a power of 2...", or just say lgK must be between 4 and 21.
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benkrug 2021-11-30 19:52:00 -07:00 committed by GitHub
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docs/development/extensions-core/datasketches-hll.md
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@ -39,7 +39,7 @@ druid.extensions.loadList=["druid-datasketches"]
|`type`|This String should be [`HLLSketchBuild`](#hllsketchbuild-aggregator) or [`HLLSketchMerge`](#hllsketchmerge-aggregator)|yes|
|`name`|A String for the output (result) name of the calculation.|yes|
|`fieldName`|A String for the name of the input field.|yes|
|`lgK`|log2 of K that is the number of buckets in the sketch, parameter that controls the size and the accuracy. Must be a power of 2 from 4 to 21 inclusively.|no, defaults to `12`|
|`lgK`|log2 of K that is the number of buckets in the sketch, parameter that controls the size and the accuracy. Must be between 4 and 21 inclusively.|no, defaults to `12`|
|`tgtHllType`|The type of the target HLL sketch. Must be `HLL_4`, `HLL_6` or `HLL_8` |no, defaults to `HLL_4`|
|`round`|Round off values to whole numbers. Only affects query-time behavior and is ignored at ingestion-time.|no, defaults to `false`|