Interface AggregateExpression

interface AggregateExpression {
    aggregator:
        | "max"
        | "sample"
        | "min"
        | "sum"
        | "count"
        | "avg"
        | "group_concat";
    distinct: boolean;
    expression: Algebra.Expression;
    separator?: string;
    subType: AGGREGATE;
    type: EXPRESSION;
}