Now handling dictionaries with one key

src/obidmscolumn.h

@@ -77,6 +77,8 @@ typedef struct OBIDMS_column_header {
 	OBIType_t			stored_data_type;		    						/**< Type of the data that is actually stored in the data
 															 	 	 	 	 *   part of the column.
 															 	 	 	 	 */
+	bool                dict_column;										/**< Whether the column contains dictionary-like values.
+	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 */
 	bool				tuples;												/**< A boolean indicating whether the column contains indices referring to indexed tuples.
 																			 */
 	bool				to_eval;											/**< A boolean indicating whether the column contains expressions that should be evaluated
@@ -249,6 +251,7 @@ size_t obi_calculate_header_size(index_t nb_elements_per_line, int64_t elts_name
  * @param elements_names The names of the elements with ';' as separator (no terminal ';'),
  *                       NULL or "" if the default names are to be used ("0\01\02\0...\0n").
  * @param elt_names_formatted Whether the separator for the elements names is ';' (false), or '\0' (true, as formatted by format_elements_names()).
+ * @param dict_column A boolean indicating whether the column should contain dictionary-like values.
  * @param tuples A boolean indicating whether the column should contain indices referring to indexed tuples.
  * @param to_eval A boolean indicating whether the column contains expressions that should be evaluated
  *                (typically OBI_STR columns containing character strings to be evaluated by Python).
@@ -271,6 +274,7 @@ OBIDMS_column_p obi_create_column(OBIDMS_p     dms,
 								  index_t      nb_elements_per_line,
 								  char*        elements_names,
 								  bool		   elt_names_formatted,
+								  bool         dict_column,
 								  bool         tuples,
 								  bool         to_eval,
 								  const char*  indexer_name,