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| author | Sergei Golubchik <serg@mariadb.org> | 2018-02-06 14:50:50 +0100 |
|---|---|---|
| committer | Sergei Golubchik <serg@mariadb.org> | 2018-02-06 14:50:50 +0100 |
| commit | 4771ae4b22d2bdef0aafc563570c71d4636a2493 (patch) | |
| tree | d115bd7c68b1e6feab68ff6fcd547e0c86c79296 /sql/sql_derived.cc | |
| parent | 60f51af755ea9d07c20a596ba21de184816fa265 (diff) | |
| parent | 0c25e58db6b045df92c209d396031cac5b528bbf (diff) | |
| download | mariadb-git-4771ae4b22d2bdef0aafc563570c71d4636a2493.tar.gz | |
Merge branch 'github/10.1' into 10.2
Diffstat (limited to 'sql/sql_derived.cc')
| -rw-r--r-- | sql/sql_derived.cc | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/sql/sql_derived.cc b/sql/sql_derived.cc index 3e84536673a..60827bd1772 100644 --- a/sql/sql_derived.cc +++ b/sql/sql_derived.cc @@ -369,7 +369,11 @@ bool mysql_derived_merge(THD *thd, LEX *lex, TABLE_LIST *derived) derived->get_unit())); if (derived->merged) + { + + DBUG_PRINT("info", ("Irreversibly merged: exit")); DBUG_RETURN(FALSE); + } if (dt_select->uncacheable & UNCACHEABLE_RAND) { @@ -745,6 +749,17 @@ bool mysql_derived_prepare(THD *thd, LEX *lex, TABLE_LIST *derived) } unit->derived= derived; + + /* + Above cascade call of prepare is important for PS protocol, but after it + is called we can check if we really need prepare for this derived + */ + if (derived->merged) + { + DBUG_PRINT("info", ("Irreversibly merged: exit")); + DBUG_RETURN(FALSE); + } + derived->fill_me= FALSE; if (!(derived->derived_result= new (thd->mem_root) select_union(thd))) @@ -886,6 +901,11 @@ bool mysql_derived_optimize(THD *thd, LEX *lex, TABLE_LIST *derived) DBUG_PRINT("enter", ("Alias: '%s' Unit: %p", (derived->alias ? derived->alias : "<NULL>"), derived->get_unit())); + if (derived->merged) + { + DBUG_PRINT("info", ("Irreversibly merged: exit")); + DBUG_RETURN(FALSE); + } if (unit->optimized) DBUG_RETURN(FALSE); |