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MDEV-20632: Recursive CTE cycle detection using CYCLE clause (nonstandard)

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Added CYCLE ... RESTRICT (nonstandard) clause to recursive CTE.
This commit is contained in:
Oleksandr Byelkin
2020-01-27 21:50:16 +01:00
parent a5584b13d1
commit 50c0939166
20 changed files with 619 additions and 147 deletions
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11
sql/sql_cte.h
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@@ -112,6 +112,7 @@ public:
always empty.
*/
List <Lex_ident_sys> column_list;
List <Lex_ident_sys> *cycle_list;
/* The query that specifies the table introduced by this with element */
st_select_lex_unit *spec;
/*
@@ -169,7 +170,7 @@ public:
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),
query_name(name), column_list(list), cycle_list(0), spec(unit),
is_recursive(false), rec_outer_references(0), with_anchor(false),
level(0), rec_result(NULL)
{ unit->with_element= this; }
@@ -206,7 +207,7 @@ public:
void inc_references() { references++; }
bool rename_columns_of_derived_unit(THD *thd, st_select_lex_unit *unit);
bool process_columns_of_derived_unit(THD *thd, st_select_lex_unit *unit);
bool prepare_unreferenced(THD *thd);
@@ -214,7 +215,7 @@ public:
table_map &unrestricted,
table_map &encountered);
void print(String *str, enum_query_type query_type);
void print(THD *thd, String *str, enum_query_type query_type);
With_clause *get_owner() { return owner; }
@@ -259,6 +260,8 @@ public:
void prepare_for_next_iteration();
void set_cycle_list(List<Lex_ident_sys> *cycle_list_arg);
friend class With_clause;
};
@@ -353,7 +356,7 @@ public:
void add_unrestricted(table_map map) { unrestricted|= map; }
void print(String *str, enum_query_type query_type);
void print(THD *thd, String *str, enum_query_type query_type);
friend class With_element;