Merge mysql.com:/home/hf/work/26921/my50-26921

into  mysql.com:/home/hf/work/26921/my51-26921

libmysqld/lib_sql.cc

@@ -242,9 +242,11 @@ static my_bool emb_read_query_result(MYSQL *mysql)
   mysql->warning_count= res->embedded_info->warning_count;
   mysql->server_status= res->embedded_info->server_status;
   mysql->field_count= res->fields;
-  mysql->fields= res->embedded_info->fields_list;
-  mysql->affected_rows= res->embedded_info->affected_rows;
-  mysql->insert_id= res->embedded_info->insert_id;
+  if (!(mysql->fields= res->embedded_info->fields_list))
+  {
+    mysql->affected_rows= res->embedded_info->affected_rows;
+    mysql->insert_id= res->embedded_info->insert_id;
+  }
   net_clear_error(&mysql->net);
   mysql->info= 0;
 

tests/mysql_client_test.c

@@ -15869,6 +15869,8 @@ static void test_status()
 
   Test that client gets updated value of insert_id on UPDATE that uses
   LAST_INSERT_ID(expr).
+  select_query added to test for bug
+    #26921 Problem in mysql_insert_id() Embedded C API function
 */
 static void test_bug21726()
 {
@@ -15881,6 +15883,8 @@ static void test_bug21726()
   const char *update_query= "UPDATE t1 SET i= LAST_INSERT_ID(i + 1)";
   int rc;
   my_ulonglong insert_id;
+  const char *select_query= "SELECT * FROM t1";
+  MYSQL_RES  *result;
 
   DBUG_ENTER("test_bug21726");
   myheader("test_bug21726");
@@ -15897,6 +15901,13 @@ static void test_bug21726()
   insert_id= mysql_insert_id(mysql);
   DIE_UNLESS(insert_id == 3);
 
+  rc= mysql_query(mysql, select_query);
+  myquery(rc);
+  insert_id= mysql_insert_id(mysql);
+  DIE_UNLESS(insert_id == 3);
+  result= mysql_store_result(mysql);
+  mysql_free_result(result);
+
   DBUG_VOID_RETURN;
 }