Github user wzhfy commented on a diff in the pull request:
    --- Diff: 
    @@ -142,319 +84,37 @@ case class HyperLogLogPlusPlus(
       override def inputTypes: Seq[AbstractDataType] = Seq(AnyDataType)
    -  override def aggBufferSchema: StructType = 
    -  /** Allocate enough words to store all registers. */
    -  override val aggBufferAttributes: Seq[AttributeReference] = 
Seq.tabulate(numWords) { i =>
    -    AttributeReference(s"MS[$i]", LongType)()
    +  override def createAggregationBuffer(): HyperLogLogPlusPlusAlgo = {
    +    new HyperLogLogPlusPlusAlgo(relativeSD)
    --- End diff --
    @hvanhovell Do you mean we put some digest object (like how 
PercentileDigest does in ApproximatePercentile) in the buffer instead of 
putting HLL++ directly in it?

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