Making a better fix for double released pointers and safe

TMP_TABLE_PARAM.
This involved moving things around in include files.
All tests, including the ones with Valgrind passed.

sql/sql_class.h

@@ -815,11 +815,52 @@ class select_create: public select_insert {
   void abort();
 };
 
+#include <myisam.h>
+
+/* Param to create temporary tables when doing SELECT:s */
+
+class TMP_TABLE_PARAM :public Sql_alloc
+{
+ public:
+  List<Item> copy_funcs;
+  List<Item> save_copy_funcs;
+  List_iterator_fast<Item> copy_funcs_it;
+  Copy_field *copy_field, *copy_field_end;
+  Copy_field *save_copy_field, *save_copy_field_end;
+  byte	    *group_buff;
+  Item	    **items_to_copy;			/* Fields in tmp table */
+  MI_COLUMNDEF *recinfo,*start_recinfo;
+  KEY *keyinfo;
+  ha_rows end_write_records;
+  uint	field_count,sum_func_count,func_count;
+  uint  hidden_field_count;
+  uint	group_parts,group_length,group_null_parts;
+  uint	quick_group;
+  bool  using_indirect_summary_function;
+
+  TMP_TABLE_PARAM()
+    :copy_funcs_it(copy_funcs), copy_field(0), group_parts(0),
+    group_length(0), group_null_parts(0)
+  {}
+  ~TMP_TABLE_PARAM()
+  {
+    cleanup();
+  }
+  inline void cleanup(void)
+  {
+    if (copy_field)				/* Fix for Intel compiler */
+    {
+      delete [] copy_field;
+      copy_field=0;
+    }
+  }
+};
+
 class select_union :public select_result {
  public:
   TABLE *table;
   COPY_INFO info;
-  TMP_TABLE_PARAM *tmp_table_param;
+  TMP_TABLE_PARAM tmp_table_param;
   bool not_describe;
 
   select_union(TABLE *table_par);

sql/sql_derived.cc

@@ -151,7 +151,7 @@ int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit,
   
     if ((derived_result=new select_union(table)))
     {
-      derived_result->tmp_table_param=&tmp_table_param;
+      derived_result->tmp_table_param=tmp_table_param;
       unit->offset_limit_cnt= select_cursor->offset_limit;
       unit->select_limit_cnt= select_cursor->select_limit+
 	select_cursor->offset_limit;

sql/sql_lex.h

@@ -397,7 +397,7 @@ class st_select_lex: public st_select_lex_node
   
   friend void mysql_init_query(THD *thd);
   st_select_lex(struct st_lex *lex);
-  st_select_lex() {;}
+  st_select_lex() {}
   void make_empty_select(st_select_lex *last_select)
   {
     select_number=INT_MAX;
@@ -480,7 +480,7 @@ typedef struct st_lex
   CHARSET_INFO *charset;
   char *help_arg;
   SQL_LIST *gorder_list;
-  st_lex() {;}
+  st_lex() {}
   inline void uncacheable()
   {
     safe_to_cache_query= 0;

sql/sql_select.cc

@@ -1281,16 +1281,10 @@ JOIN::cleanup(THD *thd)
       JOIN_TAB *tab, *end;
       for (tab= join_tab, end= tab+tables ; tab != end ; tab++)
       {
-	if (tab->select)
-	{
-	  delete tab->select;
-	  tab->select=0;
-	}
-	if (tab->quick)
-	{
-	  delete tab->quick;
-	  tab->quick=0;
-	}
+	delete tab->select;
+	delete tab->quick;
+	tab->select=0;
+	tab->quick=0;
 	x_free(tab->cache.buff);
 	tab->cache.buff= 0;
       }
@@ -3292,16 +3286,10 @@ join_free(JOIN *join, bool full)
     {
       for (tab=join->join_tab,end=tab+join->tables ; tab != end ; tab++)
       {
-	if (tab->select)
-	{
-	  delete tab->select;
-	  tab->select=0;
-	}
-	if (tab->quick)
-	{
-	  delete tab->quick;
-	  tab->quick=0;
-	}
+	delete tab->select;
+	delete tab->quick;
+	tab->select=0;
+	tab->quick=0;
 	x_free(tab->cache.buff);
 	tab->cache.buff= 0;
 	if (tab->table)

sql/sql_select.h

@@ -113,45 +113,6 @@ typedef struct st_position {			/* Used in find_best */
 } POSITION;
 
 
-/* Param to create temporary tables when doing SELECT:s */
-
-class TMP_TABLE_PARAM :public Sql_alloc
-{
- public:
-  List<Item> copy_funcs;
-  List<Item> save_copy_funcs;
-  List_iterator_fast<Item> copy_funcs_it;
-  Copy_field *copy_field, *copy_field_end;
-  Copy_field *save_copy_field, *save_copy_field_end;
-  byte	    *group_buff;
-  Item	    **items_to_copy;			/* Fields in tmp table */
-  MI_COLUMNDEF *recinfo,*start_recinfo;
-  KEY *keyinfo;
-  ha_rows end_write_records;
-  uint	field_count,sum_func_count,func_count;
-  uint  hidden_field_count;
-  uint	group_parts,group_length,group_null_parts;
-  uint	quick_group;
-  bool  using_indirect_summary_function;
-
-  TMP_TABLE_PARAM()
-    :copy_funcs_it(copy_funcs), copy_field(0), group_parts(0),
-    group_length(0), group_null_parts(0)
-  {}
-  ~TMP_TABLE_PARAM()
-  {
-    cleanup();
-  }
-  inline void cleanup(void)
-  {
-    if (copy_field)				/* Fix for Intel compiler */
-    {
-      delete [] copy_field;
-      copy_field=0;
-    }
-  }
-};
-
 class JOIN :public Sql_alloc
 {
  public:

sql/sql_union.cc

@@ -82,7 +82,7 @@ bool select_union::send_data(List<Item> &values)
     if (thd->net.last_errno == ER_RECORD_FILE_FULL)
     {
       thd->clear_error(); // do not report user about table overflow
-      if (create_myisam_from_heap(thd, table, tmp_table_param,
+      if (create_myisam_from_heap(thd, table, &tmp_table_param,
 				  info.last_errno, 0))
 	return 1;
     }
@@ -186,8 +186,7 @@ int st_select_lex_unit::prepare(THD *thd, select_result *sel_result,
     goto err;
 
   union_result->not_describe=1;
-  if (!(union_result->tmp_table_param=(TMP_TABLE_PARAM *)thd->memdup((char *)&tmp_table_param, sizeof(TMP_TABLE_PARAM))))
-    goto err;
+  union_result->tmp_table_param=tmp_table_param;
 
   /*
     The following piece of code is placed here solely for the purpose of