Dataframe that constructs representations from the columns (and conversions between them) when a dataframe is loaded. A keyed_representation and a string_representation are constructed for each column, unless the column is made up only of numerical values, in which case a vector_representation is constructed.

some_df column_rep column_name

Return a representation of the default type for the column column_name, if such exists. This is either the keyedrepresentation or the vectorrepresentation.

some_df column_rep column_name rep_type

Return a representation of subtype rep_type for the column column_name, if such exists.

some_df conversion src_column tgt_column

Returns a dfrlookupconversion from the keyedrepresentation src_column of some_df to the default representation of tgt_column of some_df. A numerical column may not be the source.