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author | Oleksandr Byelkin <sanja@mariadb.com> | 2020-08-03 14:44:06 +0200 |
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committer | Oleksandr Byelkin <sanja@mariadb.com> | 2020-08-03 14:44:06 +0200 |
commit | 57325e470615e79f674d82b2d5b09f609508fc6a (patch) | |
tree | 7a2e84a6753a5a5592f44f96194ad7a551c4669f /sql/item_subselect.h | |
parent | 706a7101bfacd29f4f5728034be92240e82df583 (diff) | |
parent | c32f71af7e4b747de223bf6b44e691941f5997cf (diff) | |
download | mariadb-git-57325e470615e79f674d82b2d5b09f609508fc6a.tar.gz |
Merge branch '10.3' into 10.4
Diffstat (limited to 'sql/item_subselect.h')
-rw-r--r-- | sql/item_subselect.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/sql/item_subselect.h b/sql/item_subselect.h index dc8417495c5..a3105bd99e0 100644 --- a/sql/item_subselect.h +++ b/sql/item_subselect.h @@ -568,7 +568,7 @@ public: bool jtbm_const_row_found; /* - TRUE<=>this is a flattenable semi-join, false overwise. + TRUE<=>this is a flattenable semi-join, false otherwise. */ bool is_flattenable_semijoin; @@ -993,7 +993,7 @@ class subselect_indexsubquery_engine: public subselect_uniquesubquery_engine /* FALSE for 'ref', TRUE for 'ref-or-null'. */ bool check_null; /* - The "having" clause. This clause (further reffered to as "artificial + The "having" clause. This clause (further referred to as "artificial having") was inserted by subquery transformation code. It contains Item(s) that have a side-effect: they record whether the subquery has produced a row with NULL certain components. We need to use it for cases @@ -1014,7 +1014,7 @@ class subselect_indexsubquery_engine: public subselect_uniquesubquery_engine However, subqueries like the above are currently not handled by index lookup-based subquery engines, the engine applicability check misses them: it doesn't switch the engine for case of artificial having and - [eq_]ref access (only for artifical having + ref_or_null or no having). + [eq_]ref access (only for artificial having + ref_or_null or no having). The above example subquery is handled as a full-blown SELECT with eq_ref access to one table. @@ -1085,7 +1085,7 @@ public: */ JOIN *materialize_join; /* - A conjunction of all the equality condtions between all pairs of expressions + A conjunction of all the equality conditions between all pairs of expressions that are arguments of an IN predicate. We need these to post-filter some IN results because index lookups sometimes match values that are actually not equal to the search key in SQL terms. |