import { SelectQuery, SimpleSelectQuery } from "../models/SelectQuery";
/**
 * UpstreamSelectQueryFinder searches upstream queries for the specified columns.
 * If a query (including its upstream CTEs or subqueries) contains all columns,
 * it returns the highest such SelectQuery. Otherwise, it searches downstream.
 * For UNION queries, it checks each branch independently.
 */
export declare class UpstreamSelectQueryFinder {
    private options;
    private tableColumnResolver?;
    private columnCollector;
    constructor(tableColumnResolver?: (tableName: string) => string[], options?: {
        ignoreCaseAndUnderscore?: boolean;
    });
    /**
     * Finds the highest SelectQuery containing all specified columns.
     * @param query The root SelectQuery to search.
     * @param columnNames A column name or array of column names to check for.
     * @returns An array of SelectQuery objects, or an empty array if not found.
     */
    find(query: SelectQuery, columnNames: string | string[]): SimpleSelectQuery[];
    private handleTableSource;
    private handleSubQuerySource;
    /**
     * Processes all source branches in a FROM clause and checks if all upstream queries contain the specified columns.
     * Returns a flat array of SelectQuery if all branches are valid, otherwise null.
     */
    private processFromClauseBranches;
    private findUpstream;
}