Sum
import type { Sum } from "https://googleapis.deno.dev/v1/datastore:v1.ts";
Sum of the values of the requested property. * Only numeric values will be
aggregated. All non-numeric values including NULL
are skipped. * If the
aggregated values contain NaN
, returns NaN
. Infinity math follows
IEEE-754 standards. * If the aggregated value set is empty, returns 0. *
Returns a 64-bit integer if all aggregated numbers are integers and the sum
result does not overflow. Otherwise, the result is returned as a double. Note
that even if all the aggregated values are integers, the result is returned
as a double if it cannot fit within a 64-bit signed integer. When this
occurs, the returned value will lose precision. * When underflow occurs,
floating-point aggregation is non-deterministic. This means that running the
same query repeatedly without any changes to the underlying values could
produce slightly different results each time. In those cases, values should
be stored as integers over floating-point numbers.
§Properties
The property to aggregate on.