Merge olga.mysql.com:/home/igor/mysql-5.0-opt

into  olga.mysql.com:/home/igor/dev-opt/mysql-5.0-opt-bug28728

include/thr_lock.h

@@ -54,6 +54,11 @@ enum thr_lock_type { TL_IGNORE=-1,
 		     TL_WRITE_CONCURRENT_INSERT,
 		     /* Write used by INSERT DELAYED.  Allows READ locks */
 		     TL_WRITE_DELAYED,
+                     /* 
+                       parser only! Late bound low_priority flag. 
+                       At open_tables() becomes thd->update_lock_default.
+                     */
+                     TL_WRITE_DEFAULT,
 		     /* WRITE lock that has lower priority than TL_READ */
 		     TL_WRITE_LOW_PRIORITY,
 		     /* Normal WRITE lock */

mysql-test/r/trigger.result

@@ -1449,4 +1449,28 @@ isave
 1
 2
 drop table t1, t2, t3;
+CREATE TABLE t1 (id INTEGER);
+CREATE TABLE t2 (id INTEGER);
+INSERT INTO t2 VALUES (1),(2);
+CREATE TRIGGER t1_test AFTER INSERT ON t1 FOR EACH ROW 
+INSERT INTO t2 VALUES (new.id);
+SELECT GET_LOCK('B26162',20);
+GET_LOCK('B26162',20)
+1
+SELECT 'rl_acquirer', GET_LOCK('B26162',5), id FROM t2 WHERE id = 1;
+SET SESSION LOW_PRIORITY_UPDATES=1;
+SET GLOBAL LOW_PRIORITY_UPDATES=1;
+INSERT INTO t1 VALUES (5);
+SELECT 'rl_contender', id FROM t2 WHERE id > 1;
+SELECT RELEASE_LOCK('B26162');
+RELEASE_LOCK('B26162')
+0
+rl_acquirer	GET_LOCK('B26162',5)	id
+rl_acquirer	0	1
+rl_contender	id
+rl_contender	2
+DROP TRIGGER t1_test;
+DROP TABLE t1,t2;
+SET SESSION LOW_PRIORITY_UPDATES=DEFAULT;
+SET GLOBAL LOW_PRIORITY_UPDATES=DEFAULT;
 End of 5.0 tests

mysql-test/t/trigger.test

@@ -1763,4 +1763,59 @@ select * from t1;
 select * from t3;
 drop table t1, t2, t3;
 
+#
+# Bug #26162: Trigger DML ignores low_priority_updates setting
+#
+CREATE TABLE t1 (id INTEGER);
+CREATE TABLE t2 (id INTEGER);
+
+INSERT INTO t2 VALUES (1),(2);
+
+# trigger that produces the high priority insert, but should be low, adding
+# LOW_PRIORITY fixes this
+CREATE TRIGGER t1_test AFTER INSERT ON t1 FOR EACH ROW 
+  INSERT INTO t2 VALUES (new.id);
+
+CONNECT (rl_acquirer,  localhost, root,,);
+CONNECT (wl_acquirer,  localhost, root,,);
+CONNECT (rl_contender, localhost, root,,);
+
+SELECT GET_LOCK('B26162',20);
+
+CONNECTION rl_acquirer;
+--send
+SELECT 'rl_acquirer', GET_LOCK('B26162',5), id FROM t2 WHERE id = 1;
+
+CONNECTION wl_acquirer;
+SET SESSION LOW_PRIORITY_UPDATES=1;
+SET GLOBAL LOW_PRIORITY_UPDATES=1;
+--send
+INSERT INTO t1 VALUES (5);
+
+CONNECTION rl_contender;
+# must not "see" the row inserted by the INSERT (as it must run before the
+# INSERT)
+--send
+SELECT 'rl_contender', id FROM t2 WHERE id > 1;
+
+CONNECTION default;
+SELECT RELEASE_LOCK('B26162');
+
+CONNECTION wl_acquirer;
+--reap
+CONNECTION rl_acquirer;
+--reap
+CONNECTION rl_contender;
+--reap
+
+CONNECTION default;
+DISCONNECT rl_acquirer;
+DISCONNECT wl_acquirer;
+DISCONNECT rl_contender;
+
+DROP TRIGGER t1_test;
+DROP TABLE t1,t2;
+SET SESSION LOW_PRIORITY_UPDATES=DEFAULT;
+SET GLOBAL LOW_PRIORITY_UPDATES=DEFAULT;
+
 --echo End of 5.0 tests

sql/set_var.cc

@@ -1226,7 +1226,11 @@ static void sys_default_ftb_syntax(THD *thd, enum_var_type type)
 
 static void fix_low_priority_updates(THD *thd, enum_var_type type)
 {
-  if (type != OPT_GLOBAL)
+  if (type == OPT_GLOBAL)
+    thr_upgraded_concurrent_insert_lock= 
+      (global_system_variables.low_priority_updates ?
+       TL_WRITE_LOW_PRIORITY : TL_WRITE);
+  else
     thd->update_lock_default= (thd->variables.low_priority_updates ?
 			       TL_WRITE_LOW_PRIORITY : TL_WRITE);
 }

sql/sql_base.cc

@@ -1505,6 +1505,7 @@ TABLE *open_table(THD *thd, TABLE_LIST *table_list, MEM_ROOT *mem_root,
   HASH_SEARCH_STATE state;
   DBUG_ENTER("open_table");
 
+  DBUG_ASSERT (table_list->lock_type != TL_WRITE_DEFAULT);
   /* find a unused table in the open table cache */
   if (refresh)
     *refresh=0;
@@ -2674,6 +2675,12 @@ int open_tables(THD *thd, TABLE_LIST **start, uint *counter, uint flags)
   for (tables= *start; tables ;tables= tables->next_global)
   {
     safe_to_ignore_table= FALSE;                // 'FALSE', as per coding style
+
+    if (tables->lock_type == TL_WRITE_DEFAULT)
+    {
+      tables->lock_type= thd->update_lock_default;
+      DBUG_ASSERT (tables->lock_type >= TL_WRITE_ALLOW_WRITE);
+    }
     /*
       Ignore placeholders for derived tables. After derived tables
       processing, link to created temporary table will be put here.

sql/sql_yacc.yy

@@ -6548,7 +6548,7 @@ insert_lock_option:
               insert visible only after the table unlocking but everyone can
               read table.
             */
-            $$= (Lex->sphead ? TL_WRITE :TL_WRITE_CONCURRENT_INSERT);
+            $$= (Lex->sphead ? TL_WRITE_DEFAULT : TL_WRITE_CONCURRENT_INSERT);
 #else
             $$= TL_WRITE_CONCURRENT_INSERT;
 #endif
@@ -6726,7 +6726,7 @@ insert_update_elem:
 	  };
 
 opt_low_priority:
-	/* empty */	{ $$= YYTHD->update_lock_default; }
+	/* empty */	{ $$= TL_WRITE_DEFAULT; }
 	| LOW_PRIORITY	{ $$= TL_WRITE_LOW_PRIORITY; };
 
 /* Delete rows from a table */
@@ -6737,7 +6737,7 @@ delete:
 	  LEX *lex= Lex;
 	  lex->sql_command= SQLCOM_DELETE;
 	  mysql_init_select(lex);
-	  lex->lock_option= lex->thd->update_lock_default;
+	  lex->lock_option= TL_WRITE_DEFAULT;
 	  lex->ignore= 0;
 	  lex->select_lex.init_order();
 	}
@@ -7402,7 +7402,7 @@ opt_local:
 	| LOCAL_SYM	{ $$=1;};
 
 load_data_lock:
-	/* empty */	{ $$= YYTHD->update_lock_default; }
+	/* empty */	{ $$= TL_WRITE_DEFAULT; }
 	| CONCURRENT
           {
 #ifdef HAVE_QUERY_CACHE
@@ -7410,7 +7410,7 @@ load_data_lock:
               Ignore this option in SP to avoid problem with query cache
             */
             if (Lex->sphead != 0)
-              $$= YYTHD->update_lock_default;
+              $$= TL_WRITE_DEFAULT;
             else
 #endif
               $$= TL_WRITE_CONCURRENT_INSERT;
@@ -8723,7 +8723,7 @@ table_lock:
 
 lock_option:
 	READ_SYM	{ $$=TL_READ_NO_INSERT; }
-	| WRITE_SYM     { $$=YYTHD->update_lock_default; }
+	| WRITE_SYM     { $$=TL_WRITE_DEFAULT; }
 	| LOW_PRIORITY WRITE_SYM { $$=TL_WRITE_LOW_PRIORITY; }
 	| READ_SYM LOCAL_SYM { $$= TL_READ; }
         ;