diff options
Diffstat (limited to 'sql/sql_cte.h')
| -rw-r--r-- | sql/sql_cte.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/sql/sql_cte.h b/sql/sql_cte.h index a87c1b8acbd..85676df9d39 100644 --- a/sql/sql_cte.h +++ b/sql/sql_cte.h @@ -46,6 +46,16 @@ private: /* Dependency map of with elements mutually recursive with this with element */ table_map mutually_recursive; /* + Dependency map built only for the top level references i.e. for those that + are encountered in from lists of the selects of the specification unit + */ + table_map top_level_dep_map; + /* + Points to a recursive reference in subqueries. + Used only for specifications without recursive references on the top level. + */ + TABLE_LIST *sq_rec_ref; + /* The next with element from the circular chain of the with elements mutually recursive with this with element. (If This element is simply recursive than next_mutually_recursive contains @@ -119,11 +129,15 @@ public: */ select_union_recursive *rec_result; + /* List of Item_subselects containing recursive references to this CTE */ + SQL_I_List<Item_subselect> sq_with_rec_ref; + With_element(LEX_CSTRING *name, List <LEX_CSTRING> list, st_select_lex_unit *unit) : next(NULL), base_dep_map(0), derived_dep_map(0), sq_dep_map(0), work_dep_map(0), mutually_recursive(0), + top_level_dep_map(0), sq_rec_ref(NULL), next_mutually_recursive(NULL), references(0), query_name(name), column_list(list), spec(unit), is_recursive(false), with_anchor(false), @@ -151,6 +165,8 @@ public: bool check_dependency_on(With_element *with_elem) { return base_dep_map & with_elem->get_elem_map(); } + TABLE_LIST *find_first_sq_rec_ref_in_select(st_select_lex *sel); + bool set_unparsed_spec(THD *thd, char *spec_start, char *spec_end); st_select_lex_unit *clone_parsed_spec(THD *thd, TABLE_LIST *with_table); @@ -174,11 +190,16 @@ public: bool contains_sq_with_recursive_reference() { return sq_dep_map & mutually_recursive; } + bool no_rec_ref_on_top_level() + { return !(top_level_dep_map & mutually_recursive); } + table_map get_mutually_recursive() { return mutually_recursive; } With_element *get_next_mutually_recursive() { return next_mutually_recursive; } + TABLE_LIST *get_sq_rec_ref() { return sq_rec_ref; } + bool is_anchor(st_select_lex *sel); void move_anchors_ahead(); |