Fix batch query with query syntax error

batch.go

@@ -167,25 +167,28 @@ func (b *Batch) ExecResults() (CommandTag, error) {
 // QueryResults reads the results from the next query in the batch as if the
 // query has been sent with Query.
 func (b *Batch) QueryResults() (*Rows, error) {
+	rows := b.conn.getRows("batch query", nil)
+
 	if b.err != nil {
-		return nil, b.err
+		rows.fatal(b.err)
+		return rows, b.err
 	}
 
 	select {
 	case <-b.ctx.Done():
 		b.die(b.ctx.Err())
-		return nil, b.ctx.Err()
+		rows.fatal(b.err)
+		return rows, b.ctx.Err()
 	default:
 	}
 
 	b.resultsRead++
 
-	rows := b.conn.getRows("batch query", nil)
-
 	fieldDescriptions, err := b.conn.readUntilRowDescription()
 	if err != nil {
-		b.die(b.ctx.Err())
+		b.die(err)
-		return nil, err
+		rows.fatal(b.err)
+		return rows, err
 	}
 
 	rows.batch = b

batch_test.go

@@ -442,3 +442,37 @@ func TestConnBeginBatchQueryError(t *testing.T) {
 		t.Error("conn should be dead, but was alive")
 	}
 }
+
+func TestConnBeginBatchQuerySyntaxError(t *testing.T) {
+	t.Parallel()
+
+	conn := mustConnect(t, *defaultConnConfig)
+	defer closeConn(t, conn)
+
+	batch := conn.BeginBatch()
+	batch.Queue("select 1 1",
+		nil,
+		nil,
+		[]int16{pgx.BinaryFormatCode},
+	)
+
+	err := batch.Send(context.Background(), nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var n int32
+	err = batch.QueryRowResults().Scan(&n)
+	if pgErr, ok := err.(pgx.PgError); !(ok && pgErr.Code == "42601") {
+		t.Errorf("rows.Err() => %v, want error code %v", err, 42601)
+	}
+
+	err = batch.Close()
+	if err == nil {
+		t.Error("Expected error")
+	}
+
+	if conn.IsAlive() {
+		t.Error("conn should be dead, but was alive")
+	}
+}