chore: add regression test for #448

packages/duckdb-wasm/test/regression/github_448.test.ts

@@ -0,0 +1,35 @@
+import * as duckdb from '../../src';
+import * as arrow from 'apache-arrow';
+
+// https://github.com/duckdb/duckdb-wasm/issues/448
+export function test448(db: () => duckdb.AsyncDuckDB): void {
+    let conn: duckdb.AsyncDuckDBConnection | null = null;
+    beforeEach(async () => {
+        await db().flushFiles();
+    });
+    afterEach(async () => {
+        if (conn) {
+            await conn.close();
+            conn = null;
+        }
+        await db().flushFiles();
+        await db().dropFiles();
+    });
+    describe('GitHub issues', () => {
+        it('448', async () => {
+            conn = await db().connect();
+            await conn.query(`create temp table test448(i integer)`);
+            await conn.query(`insert into test448 values (1),(2),(1)`);
+            let result = await conn.query(`select * from test448`);
+            expect(result.numCols).toBe(1);
+            expect(result.length).toBe(3);
+            expect(result.getColumnAt(0)?.toArray()).toEqual(new Int32Array([1, 2, 1]));
+            result = await conn.query<{ i: arrow.Map_<arrow.Int32, arrow.Uint64> }>(`select histogram(i) from test448`);
+            expect(result.numCols).toBe(1);
+            expect(result.length).toBe(1);
+            const array = result.getColumnAt(0)!.toArray();
+            expect(array.length).toEqual(1);
+            expect(array[0].toString()).toEqual('{ 1: 2, 2: 1 }');
+        });
+    });
+}

packages/duckdb-wasm/test/regression/index.ts

@@ -2,9 +2,11 @@ import * as duckdb from '../../src/';
 import { test332 } from './github_332.test';
 import { test334 } from './github_334.test';
 import { test393 } from './github_393.test';
+import { test448 } from './github_448.test';
 
 export function testRegressionAsync(adb: () => duckdb.AsyncDuckDB): void {
     test332(adb);
     test334(adb);
     test393(adb);
+    test448(adb);
 }