import type { WindowSort } from "./WindowSort.js";
/**
 * The serialized form of [`WindowSpec`].
 */
export type WindowSpec = {
    /**
     * The input column - either a real `Table` column or an expression
     * alias from the same `ViewConfig`.
     */
    column: string;
    aggregate: string;
    /**
     * Columns whose distinct value tuples partition the rows; empty
     * partitions the whole `Table` as one group.
     */
    partition_by?: Array<string>;
    /**
     * The `Table` column which orders each partition, and the direction.
     * This orders rows WITHIN the window frame only — it does not
     * reorder the `View`, which is what the view-level `sort` does.
     */
    order_by?: WindowSort | null;
    /**
     * A frame of the `rows` preceding each row, plus the row itself.
     * Mutually exclusive with `range` and `cumulative`.
     */
    rows?: number | null;
    /**
     * A frame of the rows whose `order_by` value lies within `range` of
     * each row's, requiring a numeric or temporal `order_by`. Mutually
     * exclusive with `rows` and `cumulative`.
     */
    range?: number | null;
    /**
     * `true` frames all rows from the partition start through each row.
     * Default can be omitted.
     */
    cumulative?: boolean | null;
    /**
     * Row offset for `lag`/`lead` (default 1).
     */
    offset?: number | null;
    /**
     * Smoothing factor in `(0, 1]` for `ema`.
     */
    alpha?: number | null;
};