Bug#11758414/Bug#50614: Default storage_engine not honored when set from within a stored procedure

When CREATE TABLE wasn't given ENGINE=... it would determine
the default ENGINE at parse-time rather than at execution
time, leading to incorrect behaviour (namely, later changes
to the default engine being ignore) when calling CREATE TABLE
from a stored procedure.

We now defer working out the default engine till execution of
CREATE TABLE.


mysql-test/r/sp_trans.result:
  results!
mysql-test/t/sp_trans.test:
  Show that CREATE TABLE (called from store routine) heeds
  any changes after CREATE SP / parse-time. Show that explicitly
  requesting an ENGINE still works.
sql/sql_parse.cc:
  If no ENGINE=... was given at parse-time, determine default
  engine at execution time of CREATE TABLE.
sql/sql_yacc.yy:
  If CREATE TABLE is not given ENGINE=..., don't bother
  figuring out the default engine during parsing; we'll
  do it at execution time instead to be aware of the
  latest updates.

mysql-test/r/sp_trans.result

@@ -556,3 +556,49 @@ f1	bug13575(f1)
 3	ccc
 drop function bug13575|
 drop table t3|
+SELECT @@GLOBAL.storage_engine INTO @old_engine|
+SET @@GLOBAL.storage_engine=InnoDB|
+SET @@SESSION.storage_engine=InnoDB|
+SHOW GLOBAL VARIABLES LIKE 'storage_engine'|
+Variable_name	Value
+storage_engine	InnoDB
+SHOW SESSION VARIABLES LIKE 'storage_engine'|
+Variable_name	Value
+storage_engine	InnoDB
+CREATE PROCEDURE bug11758414()
+BEGIN
+SET @@GLOBAL.storage_engine="MyISAM";
+SET @@SESSION.storage_engine="MyISAM"; 
+# show defaults at execution time / that setting them worked
+SHOW GLOBAL VARIABLES LIKE 'storage_engine';
+SHOW SESSION VARIABLES LIKE 'storage_engine';
+CREATE TABLE t1 (id int);
+CREATE TABLE t2 (id int) ENGINE=InnoDB;
+# show we're heeding the default (at run-time, not parse-time!)
+ SHOW CREATE TABLE t1;
+ # show that we didn't break explicit override with ENGINE=...
+SHOW CREATE TABLE t2;
+END;
+|
+CALL bug11758414|
+Variable_name	Value
+storage_engine	MyISAM
+Variable_name	Value
+storage_engine	MyISAM
+Table	Create Table
+t1	CREATE TABLE `t1` (
+  `id` int(11) DEFAULT NULL
+) ENGINE=MyISAM DEFAULT CHARSET=latin1
+Table	Create Table
+t2	CREATE TABLE `t2` (
+  `id` int(11) DEFAULT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=latin1
+SHOW GLOBAL VARIABLES LIKE 'storage_engine'|
+Variable_name	Value
+storage_engine	MyISAM
+SHOW SESSION VARIABLES LIKE 'storage_engine'|
+Variable_name	Value
+storage_engine	MyISAM
+DROP PROCEDURE bug11758414|
+DROP TABLE t1, t2|
+SET @@GLOBAL.storage_engine=@old_engine|

mysql-test/t/sp_trans.test

@@ -593,6 +593,39 @@ drop function bug13575|
 drop table t3|
 
 
+#
+# BUG#11758414: Default storage_engine not honored when set
+#               from within a stored procedure
+#
+SELECT @@GLOBAL.storage_engine INTO @old_engine|
+SET @@GLOBAL.storage_engine=InnoDB|
+SET @@SESSION.storage_engine=InnoDB|
+# show defaults at define-time
+SHOW GLOBAL VARIABLES LIKE 'storage_engine'|
+SHOW SESSION VARIABLES LIKE 'storage_engine'|
+CREATE PROCEDURE bug11758414()
+BEGIN
+ SET @@GLOBAL.storage_engine="MyISAM";
+ SET @@SESSION.storage_engine="MyISAM"; 
+ # show defaults at execution time / that setting them worked
+ SHOW GLOBAL VARIABLES LIKE 'storage_engine';
+ SHOW SESSION VARIABLES LIKE 'storage_engine';
+ CREATE TABLE t1 (id int);
+ CREATE TABLE t2 (id int) ENGINE=InnoDB;
+ # show we're heeding the default (at run-time, not parse-time!)
+ SHOW CREATE TABLE t1;
+ # show that we didn't break explicit override with ENGINE=...
+ SHOW CREATE TABLE t2;
+END;
+|
+CALL bug11758414|
+# show that changing defaults within SP stuck
+SHOW GLOBAL VARIABLES LIKE 'storage_engine'|
+SHOW SESSION VARIABLES LIKE 'storage_engine'|
+DROP PROCEDURE bug11758414|
+DROP TABLE t1, t2|
+SET @@GLOBAL.storage_engine=@old_engine|
+
 #
 # BUG#NNNN: New bug synopsis
 #

sql/sql_parse.cc

@@ -2616,6 +2616,12 @@ mysql_execute_command(THD *thd)
 			   create_table->table_name))
       goto end_with_restore_list;
 #endif
+    /*
+      If no engine type was given, work out the default now
+      rather than at parse-time.
+    */
+    if (!(create_info.used_fields & HA_CREATE_USED_ENGINE))
+      create_info.db_type= ha_default_handlerton(thd);
     /*
       If we are using SET CHARSET without DEFAULT, add an implicit
       DEFAULT to not confuse old users. (This may change).

sql/sql_yacc.yy

@@ -1838,7 +1838,6 @@ create:
             lex->change=NullS;
             bzero((char*) &lex->create_info,sizeof(lex->create_info));
             lex->create_info.options=$2 | $4;
-            lex->create_info.db_type= ha_default_handlerton(thd);
             lex->create_info.default_table_charset= NULL;
             lex->name.str= 0;
             lex->name.length= 0;
@@ -1847,7 +1846,8 @@ create:
           {
             LEX *lex= YYTHD->lex;
             lex->current_select= &lex->select_lex; 
-            if (!lex->create_info.db_type)
+            if ((lex->create_info.used_fields & HA_CREATE_USED_ENGINE) &&
+                !lex->create_info.db_type)
             {
               lex->create_info.db_type= ha_default_handlerton(YYTHD);
               push_warning_printf(YYTHD, MYSQL_ERROR::WARN_LEVEL_WARN,