@Override
    public Blob getBlob(final int columnIndex) throws SQLException {
        return (Blob) mergeResultSet.getValue(columnIndex, Blob.class);
    }
@Test
    void assertGetBlobWithColumnLabel() throws SQLException {
        Blob blob = mock(Blob.class);
        when(mergeResultSet.getValue(1, Blob.class)).thenReturn(blob);
        assertThat(shardingSphereResultSet.getBlob("label"), is(blob));
    }