presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/RaptorMetadata.java/RaptorMetadata/getColumnMetadata
class RaptorMetadata:    @Override
    public ColumnMetadata getColumnMetadata(ConnectorSession session, ConnectorTableHandle tableHandle, ColumnHandle columnHandle)
    {
        RaptorColumnHandle column = (RaptorColumnHandle) columnHandle;

        if (isHiddenColumn(column.getColumnId())) {
            return hiddenColumn(column.getColumnName(), column.getColumnType());
        }

        return new ColumnMetadata(column.getColumnName(), column.getColumnType());
    }