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| author | Sergei Golubchik <serg@mariadb.org> | 2021-02-23 00:56:14 +0100 |
|---|---|---|
| committer | Sergei Golubchik <serg@mariadb.org> | 2021-02-23 09:25:57 +0100 |
| commit | e841957416e9287d1e9b2e32c952d6d0c1a2e2ed (patch) | |
| tree | 7363161fe48edbecbd562f36280ce3980835f9c2 /sql/sql_statistics.h | |
| parent | 34fcd726a6d5ee6e41b48b5946df801cb079afc1 (diff) | |
| parent | 640f42311a72fa82bf7117c2791fc47ceb420361 (diff) | |
| download | mariadb-git-e841957416e9287d1e9b2e32c952d6d0c1a2e2ed.tar.gz | |
Merge branch '10.3' into 10.4
Diffstat (limited to 'sql/sql_statistics.h')
| -rw-r--r-- | sql/sql_statistics.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/sql/sql_statistics.h b/sql/sql_statistics.h index 20ecf06bfee..35b3aa33acc 100644 --- a/sql/sql_statistics.h +++ b/sql/sql_statistics.h @@ -239,6 +239,17 @@ public: bool is_available() { return get_size() > 0 && get_values(); } + /* + This function checks that histograms should be usable only when + 1) the level of optimizer_use_condition_selectivity > 3 + 2) histograms have been collected + */ + bool is_usable(THD *thd) + { + return thd->variables.optimizer_use_condition_selectivity > 3 && + is_available(); + } + void set_value(uint i, double val) { switch (type) { |