Avoid some copies.

driver/driver.go

@@ -386,8 +386,7 @@ func (r rows) Next(dest []driver.Value) error {
 		case sqlite3.TEXT:
 			dest[i] = maybeTime(r.stmt.ColumnText(i))
 		case sqlite3.BLOB:
-			buf, _ := dest[i].([]byte)
-			dest[i] = r.stmt.ColumnBlob(i, buf)
+			dest[i] = r.stmt.ColumnRawBlob(i)
 		case sqlite3.NULL:
 			if buf, ok := dest[i].([]byte); ok {
 				dest[i] = buf[0:0]

driver/driver_test.go

@@ -308,7 +308,7 @@ func Test_QueryRow_blob_null(t *testing.T) {
 
 	want := [][]byte{nil, {0xca, 0xfe}, {0xba, 0xbe}, nil}
 	for i := 0; rows.Next(); i++ {
-		var buf []byte
+		var buf sql.RawBytes
 		err = rows.Scan(&buf)
 		if err != nil {
 			t.Fatal(err)