@Override
    public InputStream getAsciiStream(final int columnIndex) throws SQLException {
        return mergeResultSet.getInputStream(columnIndex, ASCII);
    }
@Test
    void assertGetAsciiStreamWithColumnIndex() throws SQLException {
        InputStream inputStream = mock(InputStream.class);
        when(mergeResultSet.getInputStream(1, "Ascii")).thenReturn(inputStream);
        assertThat(shardingSphereResultSet.getAsciiStream(1), instanceOf(InputStream.class));
    }