 functions
<code><a href="../reference/aggregate_byname.html">aggregate_byname()</a></code>, <code><a href="../reference/rename_to_piece_byname.html">rename_to_piece_byname()</a></code>,
and <code><a href="../reference/aggregate_pieces_byname.html">aggregate_pieces_byname()</a></code> provide flexibility in how
renaming and aggregation can be accomplished. When working with
aggregation maps, the functions <code><a href="../reference/aggregation_map_helpers.html">agg_table_to_agg_map()</a></code> and
<code><