Simple cleanups

- Removing use of calls to current_thd
- More DBUG_PRINT
- Code style changes
- Made some local functions static
Ensure that calls to print_keyuse are locked with mutex to get all lines in same debug packet

sql/item.cc

@@ -4415,18 +4415,23 @@ static bool mark_as_dependent(THD *thd, SELECT_LEX *last, SELECT_LEX *current,
                               Item_ident *resolved_item,
                               Item_ident *mark_item)
 {
-  const char *db_name= (resolved_item->db_name ?
-                        resolved_item->db_name : "");
-  const char *table_name= (resolved_item->table_name ?
-                           resolved_item->table_name : "");
+  DBUG_ENTER("mark_as_dependent");
+
   /* store pointer on SELECT_LEX from which item is dependent */
   if (mark_item && mark_item->can_be_depended)
+  {
+    DBUG_PRINT("info", ("mark_item: %p  lex: %p", mark_item, last));
     mark_item->depended_from= last;
-  if (current->mark_as_dependent(thd, last, /** resolved_item psergey-thu
-    **/mark_item))
-    return TRUE;
+  }
+  if (current->mark_as_dependent(thd, last,
+                                 /** resolved_item psergey-thu **/ mark_item))
+    DBUG_RETURN(TRUE);
   if (thd->lex->describe & DESCRIBE_EXTENDED)
   {
+    const char *db_name= (resolved_item->db_name ?
+                          resolved_item->db_name : "");
+    const char *table_name= (resolved_item->table_name ?
+                             resolved_item->table_name : "");
     push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
 		 ER_WARN_FIELD_RESOLVED, ER(ER_WARN_FIELD_RESOLVED),
                  db_name, (db_name[0] ? "." : ""),
@@ -4434,7 +4439,7 @@ static bool mark_as_dependent(THD *thd, SELECT_LEX *last, SELECT_LEX *current,
                  resolved_item->field_name,
                  current->select_number, last->select_number);
   }
-  return FALSE;
+  DBUG_RETURN(FALSE);
 }
 
 
@@ -6886,7 +6891,7 @@ bool Item_ref::fix_fields(THD *thd, Item **reference)
       {
         /* The current reference cannot be resolved in this query. */
         my_error(ER_BAD_FIELD_ERROR,MYF(0),
-                 this->full_name(), current_thd->where);
+                 this->full_name(), thd->where);
         goto error;
       }
 
@@ -7021,7 +7026,7 @@ bool Item_ref::fix_fields(THD *thd, Item **reference)
           goto error;
         thd->change_item_tree(reference, fld);
         mark_as_dependent(thd, last_checked_context->select_lex,
-                          thd->lex->current_select, fld, fld);
+                          current_sel, fld, fld);
         /*
           A reference is resolved to a nest level that's outer or the same as
           the nest level of the enclosing set function : adjust the value of
@@ -7038,7 +7043,7 @@ bool Item_ref::fix_fields(THD *thd, Item **reference)
       {
         /* The item was not a table field and not a reference */
         my_error(ER_BAD_FIELD_ERROR, MYF(0),
-                 this->full_name(), current_thd->where);
+                 this->full_name(), thd->where);
         goto error;
       }
       /* Should be checked in resolve_ref_in_select_and_group(). */

sql/item_subselect.cc

@@ -464,6 +464,7 @@ void Item_subselect::recalc_used_tables(st_select_lex *new_parent,
 {
   List_iterator<Ref_to_outside> it(upper_refs);
   Ref_to_outside *upper;
+  DBUG_ENTER("recalc_used_tables");
   
   used_tables_cache= 0;
   while ((upper= it++))
@@ -523,6 +524,8 @@ void Item_subselect::recalc_used_tables(st_select_lex *new_parent,
     he has done const table detection, and that will be our chance to update
     const_tables_cache.
   */
+  DBUG_PRINT("exit", ("used_tables_cache: %llx", used_tables_cache));
+  DBUG_VOID_RETURN;
 }
 
 
@@ -1989,7 +1992,7 @@ bool Item_allany_subselect::is_maxmin_applicable(JOIN *join)
 */
 
 bool
-Item_in_subselect::create_single_in_to_exists_cond(JOIN * join,
+Item_in_subselect::create_single_in_to_exists_cond(JOIN *join,
                                                    Item **where_item,
                                                    Item **having_item)
 {

sql/sql_test.cc

@@ -248,7 +248,7 @@ TEST_join(JOIN *join)
 
 #define FT_KEYPART   (MAX_REF_PARTS+10)
 
-void print_keyuse(KEYUSE *keyuse)
+static void print_keyuse(KEYUSE *keyuse)
 {
   char buff[256];
   char buf2[64]; 
@@ -266,14 +266,11 @@ void print_keyuse(KEYUSE *keyuse)
   else
     fieldname= key_info->key_part[keyuse->keypart].field->field_name;
   ll2str(keyuse->used_tables, buf2, 16, 0); 
-  DBUG_LOCK_FILE;
   fprintf(DBUG_FILE, "KEYUSE: %s.%s=%s  optimize: %u  used_tables: %s "
           "ref_table_rows: %lu  keypart_map: %0lx\n",
           keyuse->table->alias.c_ptr(), fieldname, str.ptr(),
           (uint) keyuse->optimize, buf2, (ulong) keyuse->ref_table_rows, 
           (ulong) keyuse->keypart_map);
-  DBUG_UNLOCK_FILE;
-  //key_part_map keypart_map; --?? there can be several? 
 }
 
 
@@ -282,9 +279,9 @@ void print_keyuse_array(DYNAMIC_ARRAY *keyuse_array)
 {
   DBUG_LOCK_FILE;
   fprintf(DBUG_FILE, "KEYUSE array (%d elements)\n", keyuse_array->elements);
-  DBUG_UNLOCK_FILE;
   for(uint i=0; i < keyuse_array->elements; i++)
     print_keyuse((KEYUSE*)dynamic_array_ptr(keyuse_array, i));
+  DBUG_UNLOCK_FILE;
 }