Review fixes of new pushed code

- Fixed tests
- Optimized new code
- Fixed some unlikely core dumps
- Better bug fixes for:
  - #14397 - OPTIMIZE TABLE with an open HANDLER causes a crash
  - #14850 (ERROR 1062 when a quering a view using a Group By on a column that can be null


mysql-test/r/create.result:
  Update results after removing wrong warnings for CREATE ... SELECT
  New tests
mysql-test/r/handler.result:
  Drop used tables
mysql-test/r/kill.result:
  Make test portable
mysql-test/r/mysqlshow.result:
  Drop tables used by previous test
mysql-test/r/trigger.result:
  Reuse old procedure name
mysql-test/r/view.result:
  Extra tests
mysql-test/t/create.test:
  New tests to test fix of removing wrong warnings for CREATE ... SELECT
mysql-test/t/disabled.def:
  Enable 'kill' test (should now be portable)
mysql-test/t/handler.test:
  Drop used tables
mysql-test/t/kill.test:
  Make test portable even if kill doesn't work at once
mysql-test/t/mysqlshow.test:
  Drop tables used by previous test
mysql-test/t/trigger.test:
  Reuse old procedure name
mysql-test/t/view.test:
  Extra tests
sql/field.cc:
  Removed compiler warning
sql/ha_federated.cc:
  my_snprintf -> strmake()
  (Simple optimization)
sql/ha_ndbcluster.cc:
  Indentation cleanups and trival optimization
sql/item.cc:
  Moved save_org_in_field() to item.cc to make it easier to test
  Remove setting of null_value as this is not needed
sql/item.h:
  Moved save_org_in_field() to item.cc to make it easier to test
sql/log_event.cc:
  Remove inline of slave_load_file_stem()
  Added 'extension' parameter to slave_load_file_stem() to get smaller code
  Removed not critical (or needed) DBUG_ASSERT()'s
  Cleaned up usage of slave_load_file_stem() to not depend on constant string lengths
  Indentation fixes
sql/opt_range.cc:
  Moved code from declaration to function body
  (To make it more readable)
sql/parse_file.cc:
  Fixed DBUG_PRINT
sql/sp.cc:
  Simple cleanups
  - Removed not needed {} level
  - Ensure saved variables starts with old_
sql/sp_head.cc:
  Indentation fixes
  Remove core dump when using --debug when m_next_cached_sp == 0
  Fixed compiler warnings
  Trivial optimizations
sql/sp_head.h:
  Changed argument to set_definer() to const
  Added THD argument to recursion_level_error() to avoid call to current_thd
sql/sql_acl.cc:
  Removed not needed test (first_not_own_table is the guard)
sql/sql_base.cc:
  Removed extra empty line
sql/sql_handler.cc:
  Don't test table version in mysql_ha_read() as this is already tested in lock_tables()
  Moved call to insert_fields to be after lock_table() to guard aganst reopen of tables
  (Better fix for Bug#14397 - OPTIMIZE TABLE with an open HANDLER causes a crash)
sql/sql_insert.cc:
  Mark fields that are set in CREATE ... SELECT as used
  (Removed wrong warnings about field not having a default value)
sql/sql_parse.cc:
  Removed not needed test of 'tables' (first_not_own_table is the guard)
  Simplify code
sql/sql_select.cc:
  Use group->field to check if value is null instead of item called by 'save_org_in_field'
  This is a better bug fix for #14850 (ERROR 1062 when a quering a view using a Group By on a column that can be null)
sql/sql_trigger.cc:
  Move sql_modes_parameters outside of function
  Indentation fixes
  Fixed compiler warning
  Ensure that thd->lex->query_tables_own_last is set properly before calling check_table_access()
  (This allows us to remove the extra test in check_grant() and check_table_access())

sql/sql_handler.cc

@@ -227,6 +227,7 @@ bool mysql_ha_open(THD *thd, TABLE_LIST *tables, bool reopen)
     /* add to hash */
     if (my_hash_insert(&thd->handler_tables_hash, (byte*) hash_tables))
     {
+      my_free((char*) hash_tables, MYF(0));
       mysql_ha_close(thd, tables);
       goto err;
     }
@@ -369,28 +370,6 @@ bool mysql_ha_read(THD *thd, TABLE_LIST *tables,
     DBUG_PRINT("info-in-hash",("'%s'.'%s' as '%s' tab %p",
                                hash_tables->db, hash_tables->table_name,
                                hash_tables->alias, table));
-    /* Table might have been flushed. */
-    if (table && (table->s->version != refresh_version))
-    {
-      /*
-        We must follow the thd->handler_tables chain, as we need the
-        address of the 'next' pointer referencing this table
-        for close_thread_table().
-      */
-      for (table_ptr= &(thd->handler_tables);
-           *table_ptr && (*table_ptr != table);
-           table_ptr= &(*table_ptr)->next)
-      {}
-      (*table_ptr)->file->ha_index_or_rnd_end();
-      VOID(pthread_mutex_lock(&LOCK_open));
-      if (close_thread_table(thd, table_ptr))
-      {
-        /* Tell threads waiting for refresh that something has happened */
-        VOID(pthread_cond_broadcast(&COND_refresh));
-      }
-      VOID(pthread_mutex_unlock(&LOCK_open));
-      table= hash_tables->table= NULL;
-    }
     if (!table)
     {
       /*
@@ -448,12 +427,6 @@ bool mysql_ha_read(THD *thd, TABLE_LIST *tables,
     }
   }
 
-  if (insert_fields(thd, &thd->lex->select_lex.context,
-                    tables->db, tables->alias, &it, 0))
-    goto err0;
-
-  protocol->send_fields(&list, Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF);
-
   HANDLER_TABLES_HACK(thd);
   lock= mysql_lock_tables(thd, &tables->table, 1, 0, &not_used);
   HANDLER_TABLES_HACK(thd);
@@ -461,6 +434,12 @@ bool mysql_ha_read(THD *thd, TABLE_LIST *tables,
   if (!lock)
     goto err0; // mysql_lock_tables() printed error message already
 
+  if (insert_fields(thd, &thd->lex->select_lex.context,
+                    tables->db, tables->alias, &it, 0))
+    goto err0;
+
+  protocol->send_fields(&list, Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF);
+
   /*
     In ::external_lock InnoDB resets the fields which tell it that
     the handle is used in the HANDLER interface. Tell it again that