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| author | Igor Babaev <igor@askmonty.org> | 2016-08-26 16:09:22 -0700 |
|---|---|---|
| committer | Igor Babaev <igor@askmonty.org> | 2016-08-26 16:09:22 -0700 |
| commit | c8f85bf263a81a625089507d747236852ec87024 (patch) | |
| tree | e6d45e1d4a436994dfa9c5c84dd8a4d8b514bd5d /sql/item_subselect.h | |
| parent | f33c35240de0e2a1d33da80a081e1c8c7d941378 (diff) | |
| download | mariadb-git-c8f85bf263a81a625089507d747236852ec87024.tar.gz | |
mdev-9864: cleanup, re-factoring.
Added comments.
Diffstat (limited to 'sql/item_subselect.h')
| -rw-r--r-- | sql/item_subselect.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/sql/item_subselect.h b/sql/item_subselect.h index c1e68247220..e72f75726ed 100644 --- a/sql/item_subselect.h +++ b/sql/item_subselect.h @@ -128,6 +128,11 @@ public: /* TRUE <=> The underlying SELECT is correlated w.r.t some ancestor select */ bool is_correlated; + /* + TRUE <=> the subquery contains a recursive reference in the FROM list + of one of its selects. In this case some of subquery optimization + strategies cannot be applied for the subquery; + */ bool with_recursive_reference; enum subs_type {UNKNOWN_SUBS, SINGLEROW_SUBS, |