@Override
    public short getShort(final int columnIndex) throws SQLException {
        return (short) ResultSetUtils.convertValue(mergeResultSet.getValue(columnIndex, short.class), short.class);
    }
@Test
    void assertGetShortWithColumnIndex() throws SQLException {
        when(mergeResultSet.getValue(1, short.class)).thenReturn((short) 1);
        assertThat(shardingSphereResultSet.getShort(1), is((short) 1));
    }