- stackoverflow check added for view of view processing

- fixed bug in join view processing
- postreview fixes (BUG#9398 & BUG#8703)


sql/sql_base.cc:
  used original TABLE object to get correct name of table and db
sql/sql_view.cc:
  fixed bug of assigning select_lex for join view
sql/table.cc:
  comment fixed
  stack overflow check added
  new method for underlying base table finding
sql/table.h:
  comment fixed
  new method for underlying base table finding

sql/sql_base.cc

@@ -724,31 +724,34 @@ TABLE_LIST *find_table_in_list(TABLE_LIST *table,
 TABLE_LIST* unique_table(TABLE_LIST *table, TABLE_LIST *table_list)
 {
   TABLE_LIST *res;
-  const char *d_name= table->db, *t_name= table->table_name;
-  char d_name_buff[MAX_ALIAS_NAME], t_name_buff[MAX_ALIAS_NAME];
+  const char *d_name, *t_name;
   DBUG_ENTER("unique_table");
   DBUG_PRINT("enter", ("table alias: %s", table->alias));
-  /* temporary table is always unique */
-  if (table->table && table->table->s->tmp_table != NO_TMP_TABLE)
-    DBUG_RETURN(0);
-  if (table->view)
+
+  /*
+    If this function called for query which update table (INSERT/UPDATE/...)
+    then we have in table->table pointer to TABLE object which we are
+    updating even if it is VIEW so we need TABLE_LIST of this TABLE object
+    to get right names (even if lower_case_table_names used).
+
+    If this function called for CREATE command that we have not opened table
+    (table->table equal to 0) and right names is in current TABLE_LIST
+    object.
+  */
+  if (table->table)
   {
-    /* it is view and table opened */
-    if (lower_case_table_names)
-    {
-      strmov(t_name_buff, table->table->alias);
-      my_casedn_str(files_charset_info, t_name_buff);
-      t_name= t_name_buff;
-      strmov(d_name_buff, table->table->s->db);
-      my_casedn_str(files_charset_info, d_name_buff);
-      d_name= d_name_buff;
-    }
-    else
-    {
-      d_name= table->table->s->db;
-      t_name= table->table->alias;
-    }
+    /* temporary table is always unique */
+    if (table->table && table->table->s->tmp_table != NO_TMP_TABLE)
+      DBUG_RETURN(0);
+    table= table->find_underlying_table(table->table);
+    /*
+      as far as we have table->table we have to find real TABLE_LIST of
+      it in underlying tables
+    */
+    DBUG_ASSERT(table);
   }
+  d_name= table->db;
+  t_name= table->table_name;
 
   DBUG_PRINT("info", ("real table: %s.%s", d_name, t_name));
   for(;;)

sql/sql_view.cc

@@ -755,17 +755,17 @@ mysql_make_view(File_parser *parser, TABLE_LIST *table)
 
       table->ancestor= view_tables;
 
-      /* next table should include SELECT_LEX under this table SELECT_LEX */
-      table->ancestor->select_lex= table->select_lex;
-
       /*
         Process upper level tables of view. As far as we do noy suport union
         here we can go through local tables of view most upper SELECT
       */
-      for(tbl= (TABLE_LIST*)view_select->table_list.first;
+      for(tbl= view_tables;
           tbl;
           tbl= tbl->next_local)
       {
+        /* next table should include SELECT_LEX under this table SELECT_LEX */
+        tbl->select_lex= table->select_lex;
+
         /*
           move lock type (TODO: should we issue error in case of TMPTABLE
           algorithm and non-read locking)?

sql/table.cc

@@ -1716,7 +1716,7 @@ void st_table_list::restore_want_privilege()
     check_opt_type  - WHITH CHECK OPTION type (VIEW_CHECK_NONE,
                       VIEW_CHECK_LOCAL, VIEW_CHECK_CASCADED)
   NOTES
-    ancestor is list of tables and views used by view
+    ancestor is list of tables and views used by view (underlying tables/views)
 
   DESCRIPTION
     It is:
@@ -1750,6 +1750,9 @@ bool st_table_list::setup_ancestor(THD *thd, Item **conds,
   bool res= FALSE;
   DBUG_ENTER("st_table_list::setup_ancestor");
 
+  if (check_stack_overrun(thd, (char *)&res))
+    return TRUE;
+
   for (tbl= ancestor; tbl; tbl= tbl->next_local)
   {
     if (tbl->ancestor &&
@@ -1986,6 +1989,34 @@ bool st_table_list::setup_ancestor(THD *thd, Item **conds,
 }
 
 
+/*
+  Find underlying base tables (TABLE_LIST) which represent given
+  table_to_find (TABLE)
+
+  SYNOPSIS
+    st_table_list::find_underlying_table()
+    table_to_find table to find
+
+  RETURN
+    0  table is not found
+    found table reference
+*/
+
+st_table_list *st_table_list::find_underlying_table(TABLE *table_to_find)
+{
+  /* is this real table and table which we are looking for? */
+  if (table == table_to_find && ancestor == 0)
+    return this;
+
+  for (TABLE_LIST *tbl= ancestor; tbl; tbl= tbl->next_local)
+  {
+    TABLE_LIST *result;
+    if ((result= tbl->find_underlying_table(table_to_find)))
+      return result;
+  }
+  return 0;
+}
+
 /*
   cleunup items belonged to view fields translation table
 

sql/table.h

@@ -376,7 +376,7 @@ typedef struct st_table_list
   st_select_lex	*select_lex;
   st_lex	*view;			/* link on VIEW lex for merging */
   Field_translator *field_translation;	/* array of VIEW fields */
-  /* ancestor of this table (VIEW merge algorithm) */
+  /* list of ancestor(s) of this table (underlying table(s)/view(s) */
   st_table_list	*ancestor;
   /* most upper view this table belongs to */
   st_table_list	*belong_to_view;
@@ -448,6 +448,7 @@ typedef struct st_table_list
   void restore_want_privilege();
   bool check_single_table(st_table_list **table, table_map map);
   bool set_insert_values(MEM_ROOT *mem_root);
+  st_table_list *find_underlying_table(TABLE *table);
 } TABLE_LIST;
 
 class Item;