import { SelectQuery } from '../models/SelectQuery';
/**
 * Captures the schema metadata required to safely evaluate LEFT JOIN removal.
 */
export interface SchemaTableInfo {
    /** The fully qualified table name that appears in SQL references. */
    name: string;
    /** Column names that exist on the table for any schema validation steps. */
    columns: string[];
    /**
     * Unique key declarations for the table.
     * Each entry is an array of column names that together form a uniqueness constraint.
     */
    uniqueKeys: string[][];
}
/** Ordered set of table metadata consumed by the optimizer. */
export type SchemaInfo = SchemaTableInfo[];
/**
 * Removes LEFT JOIN clauses from the provided query when AST references prove the join target is unused and schema metadata certifies the join column is unique.
 */
export declare const optimizeUnusedLeftJoins: (query: SelectQuery, schemaInfo: SchemaInfo) => SelectQuery;
/**
 * Applies the unused left join optimizer until no further joins can be trimmed, ensuring cascading removals stabilize.
 */
export declare const optimizeUnusedLeftJoinsToFixedPoint: (query: SelectQuery, schemaInfo: SchemaInfo) => SelectQuery;
/**
 * Removes unused SELECT-only CTEs from the query when AST references confirm they are never consumed.
 */
export declare const optimizeUnusedCtes: (query: SelectQuery) => SelectQuery;
/**
 * Repeatedly prunes unused CTEs until a fixed point is reached so chained removals complete deterministically.
 */
export declare const optimizeUnusedCtesToFixedPoint: (query: SelectQuery) => SelectQuery;