@uwdata/mosaic-sql/dist/src/ast/sample.d.ts

SQL query construction and analysis.

import { SQLNode } from './node.js';
export type SampleMethod = 'reservoir' | 'bernoulli' | 'system';
export declare class SampleClauseNode extends SQLNode {
    /** The sample size as either a row count or percentage. */
    readonly size: number;
    /** Flag if the sampling unit is rows (`false`) or percentage (`true`). */
    readonly perc: boolean;
    /** The sampling method. */
    readonly method?: SampleMethod;
    /** The random seed. */
    readonly seed?: number;
    /**
     * Instantiate a sample clause node.
     * @param size The sample size as either a row count or percentage.
     * @param perc Flag indicating if the sampling unit is
     *   rows (`false`) or a percentage (`true`).
     * @param method The sampling method. If unspecified,
     *   a default method is applied based on the sampling unit.
     * @param seed The random seed.
     */
    constructor(size: number, perc?: boolean, method?: SampleMethod, seed?: number);
    /**
     * Generate a SQL query string for this node.
     */
    toString(): string;
}
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