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| author | Vicențiu Ciorbaru <vicentiu@mariadb.org> | 2018-01-24 12:29:31 +0200 |
|---|---|---|
| committer | Vicențiu Ciorbaru <vicentiu@mariadb.org> | 2018-01-24 12:29:31 +0200 |
| commit | d833bb65d53b9a4375fa71cc485b4719fdb0ee53 (patch) | |
| tree | d1271339e1c3a660e4788a5c9913bfe54e0271f1 /sql/sql_derived.cc | |
| parent | e431d90065d277e62fa4f81a1654790f58a84146 (diff) | |
| parent | 76577e1e2602f3c30859a176808c433a263e1b0a (diff) | |
| download | mariadb-git-d833bb65d53b9a4375fa71cc485b4719fdb0ee53.tar.gz | |
Merge remote-tracking branch '5.5' into 10.0
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 e9928572142..7ad0b4b4c69 100644 --- a/sql/sql_derived.cc +++ b/sql/sql_derived.cc @@ -367,7 +367,11 @@ 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) { @@ -678,6 +682,17 @@ 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 select_union)) @@ -807,6 +822,11 @@ 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); |