fix types in Quest driver

Author: KSDaemon

packages/cubejs-questdb-driver/src/QuestDriver.ts

@@ -17,6 +17,7 @@ import {
   BaseDriver, DownloadQueryResultsOptions,
   DownloadTableMemoryData, DriverInterface,
   IndexesSQL, TableStructure, QueryOptions,
+  DatabaseStructure,
 } from '@cubejs-backend/base-driver';
 import { QuestQuery } from './QuestQuery';
 
@@ -179,14 +180,14 @@ export class QuestDriver<Config extends QuestDriverConfiguration = QuestDriverCo
     // no-op as there are no schemas in QuestDB
   }
 
-  public async tablesSchema() {
+  public async tablesSchema(): Promise<DatabaseStructure> {
     const tables = await this.getTablesQuery('');
 
     // QuestDB doesn't have a notion of schema/logical database while the driver
     // has to return a `{ 'schema_name': { 'table1': {...} } }` object. So, we use
     // empty schema name ('') as a workaround to avoid the schema prefix
     // ('schema_name.') being used for table names in the generated queries.
-    const metadata: Record<string, Record<string, object>> = { '': {} };
+    const metadata: DatabaseStructure = { '': {} };
 
     // eslint-disable-next-line camelcase
     await Promise.all(tables.map(async ({ table_name: tableName }) => {
@@ -209,7 +210,7 @@ export class QuestDriver<Config extends QuestDriverConfiguration = QuestDriverCo
     return this.query('SHOW TABLES', []);
   }
 
-  public async tableColumnTypes(table: string) {
+  public async tableColumnTypes(table: string): Promise<TableStructure> {
     const response: any[] = await this.query(`SHOW COLUMNS FROM '${table}'`, []);
 
     return response.map((row) => ({ name: row.column, type: this.toGenericType(row.type) }));