@finos/perspective
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    SingleAggregate:
        | "sum"
        | "sum abs"
        | "sum not null"
        | "abs sum"
        | "pct sum parent"
        | "pct sum grand total"
        | "any"
        | "unique"
        | "dominant"
        | "q1"
        | "q3"
        | "median"
        | "first by index"
        | "first"
        | "last by index"
        | "last minus first"
        | "last"
        | "count"
        | "distinct count"
        | "avg"
        | "mean"
        | "join"
        | "high"
        | "low"
        | "max"
        | "min"
        | "high minus low"
        | "stddev"
        | "var"