DRG-12300: an index with this column list already exists in the index set
DRG-12301: index does not exist in index set
DRG-12302: invalid column list
DRG-12303: cannot add more than 99 indexes to an index set
DRG-12304: index set string does not exist
DRG-12305: column string data type is not supported for index set columns
DRG-12306: column string is too long for index set columns
DRG-12307: column string is NULL and cannot be indexed
DRG-12308: use ctx_ddl.create_index_set to create index sets