This view comes in all four «versions»: dba_tab_col_statistics, all_tab_col_statistics, user_tab_col_statistics and cdb_tab_col_statistics.
Statistics and histogram information are extracted from xxx_TAB_COLUMNS and therefore, most of the information that is found in dba_tab_col_statistics is also found in dba_tab_columns.
The columns that are found in dba_tab_col_statistics only are NOTES and SCOPE.
Column statistics for partitioned tables and composite partitioned table are found in dba_part_col_statistics and dba_subpart_col_statistics.