Bug#27006: AFTER UPDATE triggers not fired with INSERT ... ON DUPLICATE KEY

UPDATE if the row wasn't actually changed.

This bug was caused by fix for bug#19978. It causes AFTER UPDATE triggers
not firing if a row wasn't actually changed by the update part of the
INSERT .. ON DUPLICATE KEY UPDATE.

Now triggers are always fired if a row is touched by the INSERT ... ON
DUPLICATE KEY UPDATE.

mysql-test/r/trigger.result

@@ -1372,4 +1372,45 @@ INSERT INTO bug22580_t1 VALUES (1,1);
 DROP TABLE bug22580_t1;
 DROP PROCEDURE bug22580_proc_1;
 DROP PROCEDURE bug22580_proc_2;
+DROP TRIGGER IF EXISTS trg27006_a_update;
+DROP TRIGGER IF EXISTS trg27006_a_insert;
+CREATE TABLE t1 (
+`id` int(10) unsigned NOT NULL auto_increment,
+`val` varchar(10) NOT NULL,
+PRIMARY KEY  (`id`)
+);
+CREATE TABLE t2 like t1;
+CREATE TRIGGER trg27006_a_insert AFTER INSERT ON t1 FOR EACH ROW
+BEGIN
+insert into t2 values (NULL,new.val);
+END |
+CREATE TRIGGER trg27006_a_update AFTER UPDATE ON t1 FOR EACH ROW
+BEGIN
+insert into t2 values (NULL,new.val);
+END |
+INSERT INTO t1(val) VALUES ('test1'),('test2');
+SELECT * FROM t1;
+id	val
+1	test1
+2	test2
+SELECT * FROM t2;
+id	val
+1	test1
+2	test2
+INSERT INTO t1 VALUES (2,'test2') ON DUPLICATE KEY UPDATE val=VALUES(val);
+INSERT INTO t1 VALUES (3,'test3') ON DUPLICATE KEY UPDATE val=VALUES(val);
+SELECT * FROM t1;
+id	val
+1	test1
+2	test2
+3	test3
+SELECT * FROM t2;
+id	val
+1	test1
+2	test2
+3	test2
+4	test3
+DROP TRIGGER trg27006_a_insert;
+DROP TRIGGER trg27006_a_update;
+drop table t1,t2;
 End of 5.0 tests

mysql-test/t/trigger.test

@@ -1699,4 +1699,42 @@ DROP TABLE bug22580_t1;
 DROP PROCEDURE bug22580_proc_1;
 DROP PROCEDURE bug22580_proc_2;
 
+#
+# Bug#27006: AFTER UPDATE triggers not fired with INSERT ... ON DUPLICATE KEY
+#            UPDATE if the row wasn't actually changed.
+#
+--disable_warnings
+DROP TRIGGER IF EXISTS trg27006_a_update;
+DROP TRIGGER IF EXISTS trg27006_a_insert;
+--enable_warnings
+
+CREATE TABLE t1 (
+  `id` int(10) unsigned NOT NULL auto_increment,
+  `val` varchar(10) NOT NULL,
+  PRIMARY KEY  (`id`)
+);
+CREATE TABLE t2 like t1;
+DELIMITER |;
+
+CREATE TRIGGER trg27006_a_insert AFTER INSERT ON t1 FOR EACH ROW
+BEGIN
+    insert into t2 values (NULL,new.val);
+END |
+CREATE TRIGGER trg27006_a_update AFTER UPDATE ON t1 FOR EACH ROW
+BEGIN
+    insert into t2 values (NULL,new.val);
+END |
+DELIMITER ;|
+
+INSERT INTO t1(val) VALUES ('test1'),('test2');
+SELECT * FROM t1;
+SELECT * FROM t2;
+INSERT INTO t1 VALUES (2,'test2') ON DUPLICATE KEY UPDATE val=VALUES(val);
+INSERT INTO t1 VALUES (3,'test3') ON DUPLICATE KEY UPDATE val=VALUES(val);
+SELECT * FROM t1;
+SELECT * FROM t2;
+DROP TRIGGER trg27006_a_insert;
+DROP TRIGGER trg27006_a_update;
+drop table t1,t2;
+
 --echo End of 5.0 tests

sql/sql_insert.cc

@@ -1238,19 +1238,19 @@ int write_record(THD *thd, TABLE *table,COPY_INFO *info)
         if (table->next_number_field)
           table->file->adjust_next_insert_id_after_explicit_value(
             table->next_number_field->val_int());
-        info->touched++;
 
+        info->touched++;
         if ((table->file->table_flags() & HA_PARTIAL_COLUMN_READ) ||
             compare_record(table, thd->query_id))
         {
           info->updated++;
+          info->copied++;
+        }
 
         trg_error= (table->triggers &&
                     table->triggers->process_triggers(thd, TRG_EVENT_UPDATE,
                                                       TRG_ACTION_AFTER,
                                                       TRUE));
-          info->copied++;
-        }
         goto ok_or_after_trg_err;
       }
       else /* DUP_REPLACE */