The aggregation of a named entity. Valid values for this structure are SUM, MIN, MAX, COUNT, AVERAGE, DISTINCT_COUNT, STDEV, STDEVP, VAR, VARP, PERCENTILE, MEDIAN, and CUSTOM.
SUM
MIN
MAX
COUNT
AVERAGE
DISTINCT_COUNT
STDEV
STDEVP
VAR
VARP
PERCENTILE
MEDIAN
CUSTOM
The additional parameters for an aggregation function.