@Override
    public Reader getCharacterStream(final int columnIndex) throws SQLException {
        // TODO To be supported: encrypt, mask, and so on
        return mergeResultSet.getCharacterStream(columnIndex);
    }
@Test
    void assertGetCharacterStreamWithColumnLabel() throws SQLException {
        Reader reader = mock(Reader.class);
        when(mergeResultSet.getCharacterStream(1)).thenReturn(reader);
        assertThat(shardingSphereResultSet.getCharacterStream("label"), is(reader));
    }