import { type SQL, type AnyColumn } from "drizzle-orm";
/**
 * TiDB / MySQL information functions for Drizzle `sql` fragments.
 * @see https://docs.pingcap.com/tidb/stable/information-functions
 *
 * TiDB does not implement `CHARSET()`, `COERCIBILITY()`, `COLLATION()`, `ICU_VERSION()`, `ROLES_GRAPHML()`.
 * Use `tidbVersion()` for a detailed build string; `version()` returns a MySQL-compatible server version.
 */
export type InformationSqlInput = SQL | AnyColumn | string | number | boolean;
/** `BENCHMARK(count, expression)` */
export declare function sqlBenchmark(count: InformationSqlInput, expression: InformationSqlInput): SQL;
/** `CONNECTION_ID()` */
export declare function connectionId(): SQL;
/** `CURRENT_ROLE()` */
export declare function currentRole(): SQL;
/** `CURRENT_USER()` */
export declare function currentUser(): SQL;
/** `DATABASE()` */
export declare function database(): SQL;
/** `FOUND_ROWS()` */
export declare function foundRows(): SQL;
/** `LAST_INSERT_ID()` or `LAST_INSERT_ID(expr)` */
export declare function lastInsertId(expr?: InformationSqlInput): SQL;
/** `ROW_COUNT()` */
export declare function rowCount(): SQL;
/** `SCHEMA()` — synonym for `DATABASE()` */
export declare function schema(): SQL;
/** `SESSION_USER()` — synonym for `USER()` */
export declare function sessionUser(): SQL;
/** `SYSTEM_USER()` — synonym for `USER()` */
export declare function systemUser(): SQL;
/** `USER()` */
export declare function user(): SQL;
/** `VERSION()` — MySQL-compatible version string (TiDB identifies as MySQL 8.0.x). */
export declare function version(): SQL;
/** `TIDB_VERSION()` — TiDB-only detailed build information. */
export declare function tidbVersion(): SQL;
/** `CURRENT_RESOURCE_GROUP()` — TiDB-only resource group for the session. */
export declare function currentResourceGroup(): SQL;
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