import { SqlExpression } from 'druid-query-toolkit';
import { ComputeFn, Datum, PlywoodValue } from '../datatypes';
import { SQLDialect } from '../dialect';
import { Expression, ExpressionJS, ExpressionValue } from './baseExpression';
export declare class SqlRefExpression extends Expression {
    static op: string;
    static fromJS(parameters: ExpressionJS): SqlRefExpression;
    sql: string;
    parsedSql: SqlExpression;
    constructor(parameters: ExpressionValue);
    valueOf(): ExpressionValue;
    toJS(): ExpressionJS;
    toString(): string;
    changeSql(sql: string): SqlRefExpression;
    getFn(): ComputeFn;
    calc(_datum: Datum): PlywoodValue;
    getSQL(dialect: SQLDialect, _minimal?: boolean): string;
    equals(other: SqlRefExpression | undefined): boolean;
    isSqlFunction(...functionNames: string[]): boolean;
}
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