Interface AggregationFunction

interface AggregationFunction {
    operation?:
        | { $case: "avg"; avg: AvgFunction }
        | { $case: "countFunction"; countFunction: CountFunction }
        | { $case: "sum"; sum: SumFunction }
        | { $case: "min"; min: MinFunction }
        | { $case: "max"; max: MaxFunction }
        | { $case: "first"; first: FirstFunction }
        | { $case: "last"; last: LastFunction }
        | {
            $case: "approxCountDistinct";
            approxCountDistinct: ApproxCountDistinctFunction;
        }
        | {
            $case: "approxPercentile";
            approxPercentile: ApproxPercentileFunction;
        }
        | { $case: "stddevPop"; stddevPop: StddevPopFunction }
        | { $case: "stddevSamp"; stddevSamp: StddevSampFunction }
        | { $case: "varPop"; varPop: VarPopFunction }
        | { $case: "varSamp"; varSamp: VarSampFunction };
    timeWindow?: TimeWindow;
}