/**
 * Table reads on legacy systems (BASIS < 7.50, e.g. ECC 6.0 EhP7).
 *
 * The ADT data-preview endpoints behind GetSqlQuery (/datapreview/freestyle)
 * and GetTableContents (/datapreview/ddic) do not exist there, so the client
 * library refuses both. This module answers the same requests through the
 * ZMCP_ADT_DISPATCH action TABLE_READ instead — a read-only, allow-listed
 * SELECT on one table (abap/zmcp_adt_dispatch_ecc.abap, FORM table_read).
 *
 * Only simple single-table statements are translated:
 *   SELECT f1, f2 | * FROM tab [AS a] [WHERE <condition>] [ORDER BY …]
 * The WHERE text is passed on as an Open SQL condition; the ABAP side rejects
 * sub-queries and any table outside its allow list. JOINs, UNION, GROUP BY and
 * aggregates are refused here with a clear message.
 */
import type { IAbapConnection } from '@babamba2/mcp-abap-adt-interfaces';
import type { SqlQueryResponse } from '../handlers/system/readonly/handleGetSqlQuery';
/** Tables the dispatcher's TABLE_READ accepts (keep in sync with the ABAP allow list). */
export declare const LEGACY_READABLE_TABLES: readonly ["MODACT", "MODATTR", "MODSAP", "GB31", "GB92", "GB93", "T001D", "T001Q", "TBE24", "TBE34", "TPS34", "TFRM", "TFRMT", "T100", "TSTC", "TSTCP", "DD03L", "DD04L"];
/** Row cap of the ABAP TABLE_READ action (FORM table_read: max_rows > 5000 → 5000). */
export declare const DISPATCH_MAX_ROWS = 5000;
/** True for the client library's "not supported on this SAP system (legacy …)" refusal. */
export declare function isLegacyUnsupported(error: unknown): boolean;
export interface SimpleSelect {
    table: string;
    fields: string[];
    where: string;
}
/**
 * Parse a single-table SELECT into { table, fields, where }. Returns null for
 * anything else (joins, unions, aggregates, grouping, sub-selects).
 */
export declare function parseSimpleSelect(sql: string): SimpleSelect | null;
/**
 * Read rows through ZMCP_ADT_DISPATCH TABLE_READ and return them in the
 * GetSqlQuery response shape.
 */
export declare function legacyTableRead(connection: IAbapConnection, req: {
    table: string;
    fields?: string[];
    where?: string;
    maxRows: number;
    sqlQuery?: string;
}): Promise<SqlQueryResponse>;
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