/**
 * Per-engine column-type registries for Hive and Postgres.
 *
 * Each function answers "is this type string valid for this engine?". The
 * concrete `TableTypeBase` subclasses delegate `isValidColumnType` here (and
 * the Iceberg subclass delegates to `./iceberg`).
 */
/** Whether the string is a valid Hive (parquet) column type. */
export declare function isValidHiveType(typeStr: string): boolean;
/**
 * Whether a Postgres column type is collatable (a text/character type), so a
 * `COLLATE` clause is legal on it. Array and length markers are stripped first.
 *
 * @param typeStr Column type string.
 * @returns True when the base type is a collatable text type.
 */
export declare function isPostgresCollatableType(typeStr: string): boolean;
/** Whether the string is a valid Postgres 18 column type. */
export declare function isValidPostgresType(typeStr: string): boolean;