import { CommonTable } from "../models/Clause";
import { SqlComponent, SqlComponentVisitor } from "../models/SqlComponent";
import { ValueComponent } from "../models/ValueComponent";
import { TableColumnResolver } from "./TableColumnResolver";
/**
 * A visitor that collects all SelectItem instances from a SQL query structure.
 * This visitor scans through select clauses and collects all the SelectItem objects.
 * It can also resolve wildcard selectors (table.* or *) using a provided table column resolver.
 */
export declare class SelectValueCollector implements SqlComponentVisitor<void> {
    private handlers;
    private selectValues;
    private visitedNodes;
    private isRootVisit;
    private tableColumnResolver;
    private commonTableCollector;
    private commonTables;
    initialCommonTables: CommonTable[] | null;
    constructor(tableColumnResolver?: TableColumnResolver | null, initialCommonTables?: CommonTable[] | null);
    /**
     * Get all collected SelectItems as an array of objects with name and value properties
     * @returns An array of objects with name (string) and value (ValueComponent) properties
     */
    getValues(): {
        name: string;
        value: ValueComponent;
    }[];
    /**
     * Reset the collection of SelectItems
     */
    private reset;
    collect(arg: SqlComponent): {
        name: string;
        value: ValueComponent;
    }[];
    /**
     * Main entry point for the visitor pattern.
     * Implements the shallow visit pattern to distinguish between root and recursive visits.
     */
    visit(arg: SqlComponent): void;
    /**
     * Internal visit method used for all nodes.
     * This separates the visit flag management from the actual node visitation logic.
     */
    private visitNode;
    /**
     * Process a SimpleSelectQuery to collect data and store the current context
     */
    private visitSimpleSelectQuery;
    private processFromClause;
    private processJoinClause;
    private processSourceExpression;
    private visitSelectClause;
    private processSelectItem;
    private visitSourceExpression;
    private visitFromClause;
    private addSelectValueAsUnique;
}