presto-base-jdbc/src/main/java/io/prestosql/plugin/jdbc/JdbcMetadata.java/JdbcMetadata/dropColumn
class JdbcMetadata:    @Override
    public void dropColumn(ConnectorSession session, ConnectorTableHandle table, ColumnHandle column)
    {
        JdbcTableHandle tableHandle = (JdbcTableHandle) table;
        JdbcColumnHandle columnHandle = (JdbcColumnHandle) column;
        jdbcClient.dropColumn(JdbcIdentity.from(session), tableHandle, columnHandle);
    }