import type { Binary, ColumnRefItem, ExpressionValue } from 'node-sql-parser';
export declare function isColumnRef(expr: unknown): expr is ColumnRefItem;
export declare function isUnqualifiedColumnRef(expr: unknown): expr is ColumnRefItem;
export declare function isQualifiedColumnRef(expr: unknown): expr is ColumnRefItem;
export declare function getColumnName(col: ColumnRefItem): string | null;
export declare function isBinaryExpr(expr: ExpressionValue | Binary | null | undefined): expr is Binary;