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Fixed many problems in the code of With_element::check_unrestricted_recursive().

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Added the check whether there are set functions in the specifications of recursive CTE.
Added the check whether there are recursive references in subqueries.
Introduced boolean system variable 'standards_compliant_cte'. By default it's set to 'on'.
When it's set to 'off' non-standard compliant CTE can be executed.
This commit is contained in:
Galina Shalygina
2016-05-19 22:07:53 +03:00
parent 3b47632bfc
commit 46a2e41398
13 changed files with 675 additions and 52 deletions
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12
sql/sql_cte.h
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@ -35,6 +35,7 @@ private:
directly or indirectly from the i-th with element.
*/
table_map derived_dep_map;
table_map sq_dep_map;
table_map work_dep_map; // dependency map used for work
/* Dependency map of with elements mutually recursive with this with element */
table_map mutually_recursive;
@ -90,7 +91,7 @@ public:
List <LEX_STRING> list,
st_select_lex_unit *unit)
: next_elem(NULL), base_dep_map(0), derived_dep_map(0),
work_dep_map(0), mutually_recursive(0),
sq_dep_map(0), work_dep_map(0), mutually_recursive(0),
references(0), table(NULL),
query_name(name), column_list(list), spec(unit),
is_recursive(false), with_anchor(false),
@ -151,7 +152,8 @@ public:
friend class With_clause;
friend
bool st_select_lex::check_unrestricted_recursive();
bool
st_select_lex::check_unrestricted_recursive(bool only_standard_compliant);
friend
bool TABLE_LIST::is_with_table_recursive_reference();
};
@ -241,9 +243,11 @@ public:
friend class With_element;
friend
bool check_dependencies_in_with_clauses(THD *thd, With_clause *with_clauses_list);
bool
check_dependencies_in_with_clauses(THD *thd, With_clause *with_clauses_list);
friend
bool st_select_lex::check_unrestricted_recursive();
bool
st_select_lex::check_unrestricted_recursive(bool only_standard_compliant);
};