import { SqlComponent, SqlComponentVisitor } from '../models/SqlComponent';
import { TableColumnResolver } from './TableColumnResolver';
export declare class TableSchema {
    name: string;
    columns: string[];
    constructor(name: string, columns: string[]);
}
/**
 * A visitor that collects schema information (table names and column names) from a SQL query structure.
 */
export declare class SchemaCollector implements SqlComponentVisitor<void> {
    private tableColumnResolver;
    private handlers;
    private tableSchemas;
    private visitedNodes;
    private commonTables;
    private running;
    constructor(tableColumnResolver?: TableColumnResolver | null);
    /**
     * Collects schema information (table names and column names) from a SQL query structure.
     * This method ensures that the collected schema information is unique and sorted.
     * The resulting schemas and columns are sorted alphabetically to ensure deterministic ordering.
     *
     * @param arg The SQL query structure to analyze.
     */
    collect(arg: SqlComponent): TableSchema[];
    /**
     * Main entry point for the visitor pattern.
     * Implements the shallow visit pattern to distinguish between root and recursive visits.
     *
     * This method ensures that schema information is collected uniquely and sorted.
     * The resulting schemas and columns are sorted alphabetically to ensure deterministic ordering.
     *
     * @param arg The SQL component to visit.
     */
    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;
    /**
     * Resets the state of the collector for a new root visit.
     */
    private reset;
    /**
     * Consolidates table schemas by merging columns for tables with the same name.
     * This ensures that each table name appears only once in the final schema list,
     * with all its columns combined while removing duplicates.
     *
     * Note: The resulting schemas and columns are sorted alphabetically to ensure deterministic ordering.
     */
    private consolidateTableSchemas;
    private handleTableSource;
    private visitSimpleSelectQuery;
    private visitBinarySelectQuery;
    private processCollectTableSchema;
}