postreview fixes

sql/sql_lex.h:
  description of field
sql/sql_union.cc:
  layout fixed

sql/sql_lex.h

@@ -332,7 +332,10 @@ class st_select_lex_unit: public st_select_lex_node {
   Item_subselect *item;
   /* thread handler */
   THD *thd;
-  /* fake SELECT_LEX for union processing */
+  /*
+    SELECT_LEX for hidden SELECT in onion which process global
+    ORDER BY and LIMIT
+  */
   st_select_lex *fake_select_lex;
 
   st_select_lex *union_distinct; /* pointer to the last UNION DISTINCT */

sql/sql_union.cc

@@ -263,7 +263,8 @@ int st_select_lex_unit::prepare(THD *thd_arg, select_result *sel_result,
     union_result->set_table(table);
 
     thd_arg->lex->current_select= lex_select_save;
-    if (!item_list.elements){
+    if (!item_list.elements)
+    {
       Statement *stmt= thd->current_statement;
       Statement backup;
       if (stmt)