presto-iceberg/src/main/java/io/prestosql/plugin/iceberg/IcebergMetadata.java/IcebergMetadata/dropColumn
class IcebergMetadata:    @Override
    public void dropColumn(ConnectorSession session, ConnectorTableHandle tableHandle, ColumnHandle column)
    {
        IcebergTableHandle icebergTableHandle = (IcebergTableHandle) tableHandle;
        IcebergColumnHandle handle = (IcebergColumnHandle) column;
        org.apache.iceberg.Table icebergTable = getIcebergTable(metastore, hdfsEnvironment, session, icebergTableHandle.getSchemaTableName());
        icebergTable.updateSchema().deleteColumn(handle.getName()).commit();
    }