Calculate the number of unique values (using the HyperLogLog algorithm).
SumStats
base/frameworks/sumstats
SumStats::Calculation: enum
SumStats::Calculation
enum
SumStats::HLL_UNIQUE: Calculate the number of unique values.
SumStats::HLL_UNIQUE
SumStats::Reducer: record
SumStats::Reducer
record
double
&default
0.01
&optional
The error margin for HLL.
0.95
The confidence for HLL.
SumStats::ResultVal: record
SumStats::ResultVal
count
0
If cardinality is being tracked, the number of unique items is tracked here.
card: opaque of cardinality &optional
opaque
hll_error_margin: double &optional
hll_confidence: double &optional
Table of Contents