moved similar code to function

onversion with check

sql/item.cc

@@ -463,27 +463,7 @@ bool Item_field::fix_fields(THD *thd, TABLE_LIST *tables, Item **ref)
 	  Mark all selects from resolved to 1 before select where was 
 	  found table as depended (of select where was found table)
 	*/
-	for (SELECT_LEX_NODE *s= thd->lex.current_select;
-	     s && s != last;
-	     s= s->outer_select())
-	{
-	  if( !s->dependent)
-	  {
-	    // Select is depended of outer select
-	    s->dependent= 1;
-	    if (s->linkage != GLOBAL_OPTIONS_TYPE)
-	    { 
-              //s is st_select_lex*
-	      
-	      s->master_unit()->dependent= 1;
-	      //Tables will be reopened many times
-	      for (TABLE_LIST *tbl= s->get_table_list();
-		   tbl;
-		   tbl= tbl->next)
-		tbl->shared= 1;
-	    }
-	  }
-	}
+	thd->lex.current_select->mark_as_dependent(last);
       }
     } 
     else if (!tmp)
@@ -867,30 +847,7 @@ bool Item_ref::fix_fields(THD *thd,TABLE_LIST *tables, Item **reference)
       else
       {
 	depended_from= last;
-	/*
-	  Mark all selects from resolved to 1 before select where was
-	  found table as depended (of select where was found table)
-	*/
-	for (SELECT_LEX_NODE *s= thd->lex.current_select;
-	     s &&s != last;
-	     s= s->outer_select())
-	  if( !s->dependent )
-	  {
-	    // Select is depended of outer select
-	    s->dependent= 1;
-	    if (s->linkage != GLOBAL_OPTIONS_TYPE)
-	    { 
-              //s is st_select_lex*
-
-	      s->master_unit()->dependent= 1;
-	      //Tables will be reopened many times
-	      for (TABLE_LIST *tbl=
-		     s->get_table_list();
-		   tbl;
-		   tbl= tbl->next)
-		tbl->shared= 1;
-	    }
-	  }
+	thd->lex.current_select->mark_as_dependent(last);
       }
     }
     else if (!ref)

sql/item_sum.cc

@@ -943,7 +943,7 @@ bool Item_sum_count_distinct::fix_fields(THD *thd, TABLE_LIST *tables,
 bool Item_sum_count_distinct::setup(THD *thd)
 {
   List<Item> list;
-  SELECT_LEX *select_lex= (SELECT_LEX *)current_lex->current_select;
+  SELECT_LEX *select_lex= current_lex->current_select->select_lex();
   if (select_lex->linkage == GLOBAL_OPTIONS_TYPE)
     return 1;
     

sql/sql_delete.cc

@@ -285,11 +285,7 @@ multi_delete::initialize_tables(JOIN *join)
 				     table->file->ref_length,
 				     MEM_STRIP_BUF_SIZE);
   }
-  /*
-    There are (SELECT_LEX*) pointer conversion here global union parameters
-    can't be used in multidelete
-  */
-  init_ftfuncs(thd, (SELECT_LEX*)thd->lex.current_select, 1);
+  init_ftfuncs(thd, thd->lex.current_select->select_lex(), 1);
 }
 
 

sql/sql_derived.cc

@@ -57,7 +57,7 @@ int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *unit, TABLE_LIST *t,
   {
     if (cursor->derived)
     {
-      res=mysql_derived(thd, lex, (SELECT_LEX_UNIT *)cursor->derived,
+      res= mysql_derived(thd, lex, (SELECT_LEX_UNIT *)cursor->derived,
 			 cursor, 0);
       if (res) DBUG_RETURN(res);
     }

sql/sql_lex.cc

@@ -21,6 +21,7 @@
 #include "item_create.h"
 #include <m_ctype.h>
 #include <hash.h>
+#include <assert.h>
 
 LEX_STRING tmp_table_alias= {(char*) "tmp-table",8};
 
@@ -1043,6 +1044,13 @@ void st_select_lex_node::exclude()
   */
 }
 
+st_select_lex* st_select_lex_node::select_lex()
+{
+  DBUG_ENTER("st_select_lex_node::select_lex (never should be called)");
+  DBUG_ASSERT(1);
+  DBUG_RETURN(0);
+}
+
 bool st_select_lex_node::add_item_to_list(Item *item)
 {
   return 1;
@@ -1053,7 +1061,6 @@ bool  st_select_lex_node::add_group_to_list(Item *item, bool asc)
   return 1; 
 }
 
-//why compiler/linker do not allow make it inline?
 bool st_select_lex_node::add_order_to_list(Item *item, bool asc)
 { 
   return add_to_list(order_list,item,asc);
@@ -1064,6 +1071,47 @@ bool st_select_lex_node::add_ftfunc_to_list(Item_func_match *func)
   return 1;
 }
 
+/*
+  st_select_lex_node::mark_as_dependent mark all st_select_lex struct from 
+  this to 'last' as dependent
+
+  SYNOPSIS
+    last - pointer to last st_select_lex struct, before wich all 
+           st_select_lex have to be marked as dependent
+
+  NOTE
+    'last' should be reachable from this st_select_lex_node
+
+*/
+
+void st_select_lex_node::mark_as_dependent(SELECT_LEX *last)
+{
+  /*
+    Mark all selects from resolved to 1 before select where was
+    found table as depended (of select where was found table)
+  */
+  for (SELECT_LEX_NODE *s= this;
+       s &&s != last;
+       s= s->outer_select())
+    if( !s->dependent )
+    {
+      // Select is dependent of outer select
+      s->dependent= 1;
+      if (s->linkage != GLOBAL_OPTIONS_TYPE)
+      { 
+	//s is st_select_lex*
+
+	s->master_unit()->dependent= 1;
+	//Tables will be reopened many times
+	for (TABLE_LIST *tbl=
+	       s->get_table_list();
+	     tbl;
+	     tbl= tbl->next)
+	  tbl->shared= 1;
+      }
+    }
+}
+
 bool st_select_lex_node::set_braces(bool value)      { return 1; }
 bool st_select_lex_node::inc_in_sum_expr()           { return 1; }
 uint st_select_lex_node::get_in_sum_expr()           { return 0; }
@@ -1168,6 +1216,10 @@ st_select_lex* st_select_lex_unit::outer_select()
   return (st_select_lex*) master;
 }
 
+st_select_lex* st_select_lex::select_lex()
+{
+  return this;
+}
 
 bool st_select_lex::add_item_to_list(Item *item)
 {

sql/sql_lex.h

@@ -217,6 +217,7 @@ public:
   void include_global(st_select_lex_node **plink);
   void exclude();
 
+  virtual st_select_lex* select_lex();
   virtual bool add_item_to_list(Item *item);
   bool add_order_to_list(Item *item, bool asc);
   virtual bool add_group_to_list(Item *item, bool asc);
@@ -239,6 +240,7 @@ public:
 					List<String> *use_index= 0,
 					List<String> *ignore_index= 0);
 
+  void mark_as_dependent(st_select_lex *last);
 private:
   void fast_exclude();
 };
@@ -346,6 +348,8 @@ public:
   bool set_braces(bool value);
   bool inc_in_sum_expr();
   uint get_in_sum_expr();
+
+  st_select_lex* select_lex();
   bool add_item_to_list(Item *item);
   bool add_group_to_list(Item *item, bool asc);
   bool add_ftfunc_to_list(Item_func_match *func);

sql/sql_parse.cc

@@ -2927,7 +2927,7 @@ mysql_init_query(THD *thd)
 void
 mysql_init_select(LEX *lex)
 {
-  SELECT_LEX *select_lex= (SELECT_LEX *)lex->current_select;
+  SELECT_LEX *select_lex= lex->current_select->select_lex();
   DBUG_ASSERT(select_lex->linkage != GLOBAL_OPTIONS_TYPE);
   select_lex->init_select();
   select_lex->master_unit()->select_limit= select_lex->select_limit= 
@@ -2964,7 +2964,7 @@ mysql_new_select(LEX *lex, bool move_down)
     
   select_lex->master_unit()->global_parameters= select_lex;
   DBUG_ASSERT(lex->current_select->linkage != GLOBAL_OPTIONS_TYPE);
-  select_lex->include_global(((SELECT_LEX*)lex->current_select)->
+  select_lex->include_global(lex->current_select->select_lex()->
 			     next_select_in_list_addr());
   lex->current_select= select_lex;
   return 0;

sql/sql_update.cc

@@ -508,14 +508,7 @@ multi_update::prepare(List<Item> &values, SELECT_LEX_UNIT *u)
       counter++;
     }
   }
-  /*
-    
-    There are (SELECT_LEX*) pointer conversion here global union parameters
-    can't be used in multiupdate
-
-    TODO: check is thd->lex.current_select == &thd->lex.select_lex?
-  */
-  init_ftfuncs(thd, (SELECT_LEX*)thd->lex.current_select, 1);
+  init_ftfuncs(thd, thd->lex.current_select->select_lex(), 1);
   error = 0; // Timestamps do not need to be restored, so far ...
   DBUG_RETURN(0);
 }

sql/sql_yacc.yy

@@ -2215,11 +2215,7 @@ in_sum_expr:
 	}
 	expr
 	{
-  	/* 
-	  There are (SELECT_LEX *) pointer conversionis here, because 
-	  global union parameters checked in 'increment' above
-	*/
-	  ((SELECT_LEX *)Select)->in_sum_expr--;
+	  Select->select_lex()->in_sum_expr--;
 	  $$=$2;
 	};
 
@@ -2296,12 +2292,7 @@ join_table_list:
 	  { add_join_on($4,$6); $$=$4; }
 	| join_table_list INNER_SYM JOIN_SYM join_table_list
 	  {
-  	    /* 
-	      There are (SELECT_LEX *) pointer conversionis here and 
-	      following joins, because it is impossible FROM clause in
-	      global union parameters 
-	    */
-	    SELECT_LEX *sel= (SELECT_LEX *)Select;
+	    SELECT_LEX *sel= Select->select_lex();
 	    sel->db1=$1->db; sel->table1=$1->alias;
 	    sel->db2=$4->db; sel->table2=$4->alias;
 	  }
@@ -2311,7 +2302,7 @@ join_table_list:
 	  { add_join_on($5,$7); $5->outer_join|=JOIN_TYPE_LEFT; $$=$5; }
 	| join_table_list LEFT opt_outer JOIN_SYM join_table_list
 	  {
-	    SELECT_LEX *sel= (SELECT_LEX *)Select;
+	    SELECT_LEX *sel= Select->select_lex();
 	    sel->db1=$1->db; sel->table1=$1->alias;
 	    sel->db2=$5->db; sel->table2=$5->alias;
 	  }
@@ -2323,7 +2314,7 @@ join_table_list:
 	  { add_join_on($1,$7); $1->outer_join|=JOIN_TYPE_RIGHT; $$=$1; }
 	| join_table_list RIGHT opt_outer JOIN_SYM join_table_list
 	  {
-	    SELECT_LEX *sel= (SELECT_LEX *)Select;
+	    SELECT_LEX *sel= Select->select_lex();
 	    sel->db1=$1->db; sel->table1=$1->alias;
 	    sel->db2=$5->db; sel->table2=$5->alias;
 	  }
@@ -2341,7 +2332,7 @@ normal_join:
 
 join_table:
 	{
-	  SELECT_LEX *sel= (SELECT_LEX *)Select;
+	  SELECT_LEX *sel= Select->select_lex();
 	  sel->use_index_ptr=sel->ignore_index_ptr=0;
 	}
         table_ident opt_table_alias opt_key_definition
@@ -2388,45 +2379,40 @@ opt_key_definition:
 	/* empty */	{}
 	| USE_SYM    key_usage_list
           {
-  	    /* 
-	      There are (SELECT_LEX *) pointer conversionis here and 
-	      following key definitions, because 
-	      key definitions is impossible in union global parameters
-	    */
-	    SELECT_LEX *sel= (SELECT_LEX*)Select;
+	    SELECT_LEX *sel= Select->select_lex();
 	    sel->use_index= *$2;
 	    sel->use_index_ptr= &sel->use_index;
 	  }
 	| IGNORE_SYM key_usage_list
 	  {
-	    SELECT_LEX *sel= (SELECT_LEX*)Select;
+	    SELECT_LEX *sel= Select->select_lex();
 	    sel->ignore_index= *$2;
 	    sel->ignore_index_ptr= &sel->ignore_index;
 	  };
 
 key_usage_list:
-	key_or_index { ((SELECT_LEX *)Select)->interval_list.empty(); }
+	key_or_index { Select->select_lex()->interval_list.empty(); }
         '(' key_usage_list2 ')'
-        { $$= &((SELECT_LEX *)Select)->interval_list; };
+        { $$= &Select->select_lex()->interval_list; };
 
 key_usage_list2:
 	key_usage_list2 ',' ident
-        { ((SELECT_LEX *)Select)->
+        { Select->select_lex()->
 	    interval_list.push_back(new String((const char*) $3.str, $3.length,
 				    default_charset_info)); }
 	| ident
-        { ((SELECT_LEX *)Select)->
+        { Select->select_lex()->
 	    interval_list.push_back(new String((const char*) $1.str, $1.length,
 				    default_charset_info)); }
 	| PRIMARY_SYM
-        { ((SELECT_LEX *)Select)->
+        { Select->select_lex()->
 	    interval_list.push_back(new String("PRIMARY", 7,
 				    default_charset_info)); };
 
 using_list:
 	ident
 	  {
-	    SELECT_LEX *sel= (SELECT_LEX *)Select;
+	    SELECT_LEX *sel= Select->select_lex();
 	    if (!($$= new Item_func_eq(new Item_field(sel->db1, sel->table1,
 						      $1.str),
 				       new Item_field(sel->db2, sel->table2,
@@ -2435,7 +2421,7 @@ using_list:
 	  }
 	| using_list ',' ident
 	  {
-	    SELECT_LEX *sel= (SELECT_LEX *)Select;
+	    SELECT_LEX *sel= Select->select_lex();
 	    if (!($$= new Item_cond_and(new Item_func_eq(new Item_field(sel->db1,sel->table1,$3.str), new Item_field(sel->db2,sel->table2,$3.str)), $1)))
 	      YYABORT;
 	  };
@@ -2467,22 +2453,14 @@ opt_table_alias:
 
 
 where_clause:
-	/* 
-	  There are (SELECT_LEX *) pointer conversionis here, because 
-	  it is impossible where_clause in global union parameters
-	*/
-	/* empty */  { ((SELECT_LEX *)Select)->where= 0; }  
-	| WHERE expr { ((SELECT_LEX *)Select)->where= $2; };
+	/* empty */  { Select->select_lex()->where= 0; }  
+	| WHERE expr { Select->select_lex()->where= $2; };
 
 having_clause:
-	/* 
-	  There are (SELECT_LEX *) pointer conversionis here, because 
-	  it is impossible having_clause in global union parameters
-	*/
 	/* empty */
-	| HAVING { ((SELECT_LEX *)Select)->create_refs= 1; } expr
+	| HAVING { Select->select_lex()->create_refs= 1; } expr
 	{
-	  SELECT_LEX *sel= (SELECT_LEX*)Select;
+	  SELECT_LEX *sel= Select->select_lex();
 	  sel->having= $3; sel->create_refs=0;
 	};
 
@@ -2517,7 +2495,7 @@ olap_opt:
 		       "global union parameters");
 	      YYABORT;
 	    }
-	    ((SELECT_LEX *)lex->current_select)->olap= CUBE_TYPE;
+	    lex->current_select->select_lex()->olap= CUBE_TYPE;
 	    net_printf(lex->thd, ER_NOT_SUPPORTED_YET, "CUBE");
 	    YYABORT;	/* To be deleted in 4.1 */
 	  }
@@ -2531,7 +2509,7 @@ olap_opt:
 		       "global union parameters");
 	      YYABORT;
 	    }
-	    ((SELECT_LEX *)lex->current_select)->olap= ROLLUP_TYPE;
+	    lex->current_select->select_lex()->olap= ROLLUP_TYPE;
 	    net_printf(lex->thd, ER_NOT_SUPPORTED_YET, "ROLLUP");
 	    YYABORT;	/* To be deleted in 4.1 */
 	  }
@@ -2555,7 +2533,7 @@ order_clause:
 	    YYABORT;
 	  }	
 	  if (lex->current_select->linkage != GLOBAL_OPTIONS_TYPE &&
-	      ((SELECT_LEX*)lex->current_select)->olap !=
+	      lex->current_select->select_lex()->olap !=
 	      UNSPECIFIED_OLAP_TYPE)
 	  {
 	    net_printf(lex->thd, ER_WRONG_USAGE,
@@ -2583,7 +2561,7 @@ limit_clause:
 	  {
 	    LEX *lex= Lex;
 	    if (lex->current_select->linkage != GLOBAL_OPTIONS_TYPE &&
-	        ((SELECT_LEX*)lex->current_select)->olap !=
+	        lex->current_select->select_lex()->olap !=
 		UNSPECIFIED_OLAP_TYPE)
 	    {
 	      net_printf(lex->thd, ER_WRONG_USAGE, "CUBE/ROLLUP",
@@ -2598,7 +2576,7 @@ limit_clause:
 	  {
 	    LEX *lex=Lex;
 	    if (lex->current_select->linkage != GLOBAL_OPTIONS_TYPE &&
-                ((SELECT_LEX*)lex->current_select)->olap !=
+                lex->current_select->select_lex()->olap !=
 		UNSPECIFIED_OLAP_TYPE)
 	    {
 	      net_printf(lex->thd, ER_WRONG_USAGE, "CUBE/ROLLUP",
@@ -4005,12 +3983,7 @@ opt_table:
 	'*'
 	  {
 	    LEX *lex= Lex;
-	    /* 
-	      There are (SELECT_LEX *) pointer conversionis here and following
-	      opt_table, because it is impossible GRANT clause in global 
-	      union parameters
-	    */
-	    ((SELECT_LEX *)lex->current_select)->db= lex->thd->db;
+	    lex->current_select->select_lex()->db= lex->thd->db;
 	    if (lex->grant == GLOBAL_ACLS)
 	      lex->grant = DB_ACLS & ~GRANT_ACL;
 	    else if (lex->columns.elements)
@@ -4022,7 +3995,7 @@ opt_table:
 	| ident '.' '*'
 	  {
 	    LEX *lex= Lex;
-	    ((SELECT_LEX *)lex->current_select)->db = $1.str;
+	    lex->current_select->select_lex()->db = $1.str;
 	    if (lex->grant == GLOBAL_ACLS)
 	      lex->grant = DB_ACLS & ~GRANT_ACL;
 	    else if (lex->columns.elements)
@@ -4034,7 +4007,7 @@ opt_table:
 	| '*' '.' '*'
 	  {
 	    LEX *lex= Lex;
-	    ((SELECT_LEX *)lex->current_select)->db = NULL;
+	    lex->current_select->select_lex()->db = NULL;
 	    if (lex->grant == GLOBAL_ACLS)
 	      lex->grant= GLOBAL_ACLS & ~GRANT_ACL;
 	    else if (lex->columns.elements)
@@ -4227,7 +4200,7 @@ optional_order_or_limit:
 	      send_error(lex->thd, ER_SYNTAX_ERROR);
 	      YYABORT;
 	    }
-	    SELECT_LEX *sel= (SELECT_LEX *)lex->current_select;
+	    SELECT_LEX *sel= lex->current_select->select_lex();
 	    sel->master_unit()->global_parameters= 
 	      sel->master_unit();
 	    lex->current_select= sel->master_unit();