import { Select, Expr, Operation } from './schema';
/** Converts a JSON `Select` object and its contents into normal form, in-place.
 *  - Uppercases all object keys and operator names.
 *  - Turns result columns declared as plain path strings into proper '.' operations.
 *  - Breaks up property paths, for example `[".foo.bar"]` becomes `[".", "foo", "bar"]`.
 *  - Converts shorthand `["$foo"]` into `["$", "foo"]`, and the same for '?'.
 * This isn't necessary for JSON generated by this library's N1QL parser,
 * but is required if we decide to accept externally-created JSON, whether hand-written or
 * produced by LiteCore. */
export declare function Normalize(select: Select): void;
/** Ensures that every '.' and 'META()' expression starts with a valid source alias. */
export declare function NormalizePaths(select: Select, aliases: Map<string, unknown>, singleSource: string | undefined): void;
/** Calls `visitor` on every Operation. Iteration stops if it returns false. */
export declare function VisitSelect(select: Select, visitor: (op: string, subexpr: Operation) => boolean): void;
/** Calls `visitor` on every Operation. Iteration stops if it returns false. */
export declare function VisitExpr(expr: Expr, visitor: (op: string, subexpr: Operation) => boolean): boolean;
/** Returns the set of source/result aliases accessed by an Expr. */
export declare function ExprAliases(expr: Expr): Set<string>;
/** Given a predicate expression such as a SELECT's WHERE or a JOIN's ON,
 *  converts it to an array of one or more Operations that must all be true,
 *  i.e. that are implicitly joined by AND. */
export declare function SplitANDs(where: Expr): Operation[];