presto-phoenix/src/main/java/io/prestosql/plugin/phoenix/PhoenixMetadata.java/PhoenixMetadata/addColumn
class PhoenixMetadata:    @Override
    public void addColumn(ConnectorSession session, ConnectorTableHandle tableHandle, ColumnMetadata column)
    {
        JdbcTableHandle handle = (JdbcTableHandle) tableHandle;
        phoenixClient.execute(session, format(
                "ALTER TABLE %s ADD %s %s",
                getEscapedTableName(Optional.ofNullable(handle.getSchemaName()), handle.getTableName()),
                column.getName(),
                phoenixClient.toWriteMapping(session, column.getType()).getDataType()));
    }