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MDEV-10372: EXPLAIN fixes for recursive CTEs, including FORMAT=JSON

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- Tabular EXPLAIN now prints "RECURSIVE UNION".
- There is a basic implementation of EXPLAIN FORMAT=JSON.
- it produces "recursive_union" JSON struct
- No other details or ANALYZE support, yet.
This commit is contained in:
Sergei Petrunia
2016-08-08 23:02:52 +03:00
parent e1c92a6ca9
commit a2f245e49f
8 changed files with 493 additions and 17 deletions
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4
sql/sql_select.h
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@ -2278,4 +2278,8 @@ public:
bool test_if_order_compatible(SQL_I_List<ORDER> &a, SQL_I_List<ORDER> &b);
int test_if_group_changed(List<Cached_item> &list);
int create_sort_index(THD *thd, JOIN *join, JOIN_TAB *tab, Filesort *fsort);
JOIN_TAB *first_explain_order_tab(JOIN* join);
JOIN_TAB *next_explain_order_tab(JOIN* join, JOIN_TAB* tab);
#endif /* SQL_SELECT_INCLUDED */