BUG#19914 SELECT COUNT(*) sometimes returns MAX_INT on cluster tables

post-review fixes as indicated by Serg.

manual testing of error cases done in 5.0 due to support for DBUG_EXECUTE_IF
to insert errors.
Unable to write test case for mysql-test until 5.1 due to support for setting
debug options at runtime.

sql/ha_blackhole.cc

@@ -100,7 +100,7 @@ void ha_blackhole::position(const byte *record)
 }
 
 
-void ha_blackhole::info(uint flag)
+int ha_blackhole::info(uint flag)
 {
   DBUG_ENTER("ha_blackhole::info");
 
@@ -114,7 +114,7 @@ void ha_blackhole::info(uint flag)
   delete_length= 0;
   if (flag & HA_STATUS_AUTO)
     auto_increment_value= 1;
-  DBUG_VOID_RETURN;
+  DBUG_RETURN(0);
 }
 
 int ha_blackhole::external_lock(THD *thd, int lock_type)

sql/ha_blackhole.h

@@ -78,7 +78,7 @@ public:
   int index_first(byte * buf);
   int index_last(byte * buf);
   void position(const byte *record);
-  void info(uint flag);
+  int info(uint flag);
   int external_lock(THD *thd, int lock_type);
   uint lock_count(void) const;
   int create(const char *name, TABLE *table_arg,

sql/ha_isam.cc

@@ -178,7 +178,7 @@ void ha_isam::position(const byte *record)
   ha_store_ptr(ref, ref_length, position);
 }
 
-void ha_isam::info(uint flag)
+int ha_isam::info(uint flag)
 {
   N_ISAMINFO info;
   (void) nisam_info(file,&info,flag);
@@ -224,6 +224,7 @@ void ha_isam::info(uint flag)
   }
   if (flag & HA_STATUS_TIME)
     update_time = info.update_time;
+  return 0;
 }
 
 

sql/ha_isam.h

@@ -67,7 +67,7 @@ class ha_isam: public handler
   int rnd_next(byte *buf);
   int rnd_pos(byte * buf, byte *pos);
   void position(const byte *record);
-  void info(uint);
+  int info(uint);
   int extra(enum ha_extra_function operation);
   int external_lock(THD *thd, int lock_type);
   ha_rows records_in_range(uint inx, key_range *min_key, key_range *max_key);

sql/ha_isammrg.cc

@@ -149,7 +149,7 @@ void ha_isammrg::position(const byte *record)
 }
 
 
-void ha_isammrg::info(uint flag)
+int ha_isammrg::info(uint flag)
 {
   MERGE_INFO info;
   (void) mrg_info(file,&info,flag);
@@ -163,6 +163,7 @@ void ha_isammrg::info(uint flag)
   block_size=0;
   update_time=0;
   ref_length=4;					// Should be big enough
+  return 0;
 }
 
 

sql/ha_isammrg.h

@@ -58,7 +58,7 @@ class ha_isammrg: public handler
   int rnd_next(byte *buf);
   int rnd_pos(byte * buf, byte *pos);
   void position(const byte *record);
-  void info(uint);
+  int info(uint);
   int extra(enum ha_extra_function operation);
   int external_lock(THD *thd, int lock_type);
   uint lock_count(void) const;

sql/item_sum.cc

@@ -1410,12 +1410,20 @@ bool Item_sum_count_distinct::add()
 
 longlong Item_sum_count_distinct::val_int()
 {
+  int error;
   DBUG_ASSERT(fixed == 1);
   if (!table)					// Empty query
     return LL(0);
   if (use_tree)
     return tree->elements_in_tree;
-  table->file->info(HA_STATUS_VARIABLE | HA_STATUS_NO_LOCK);
+
+  error= table->file->info(HA_STATUS_VARIABLE | HA_STATUS_NO_LOCK);
+
+  if(error)
+  {
+    table->file->print_error(error, MYF(0));
+  }
+
   return table->file->records;
 }
 

sql/sql_delete.cc

@@ -43,7 +43,12 @@ int mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds,
   if ((open_and_lock_tables(thd, table_list)))
     DBUG_RETURN(-1);
   table= table_list->table;
-  table->file->info(HA_STATUS_VARIABLE | HA_STATUS_NO_LOCK);
+  error= table->file->info(HA_STATUS_VARIABLE | HA_STATUS_NO_LOCK);
+  if (error)
+  {
+    table->file->print_error(error, MYF(0));
+    DBUG_RETURN(error);
+  }
   thd->proc_info="init";
   table->map=1;
 

sql/sql_select.cc

@@ -1786,7 +1786,12 @@ make_join_statistics(JOIN *join,TABLE_LIST *tables,COND *conds,
     s->checked_keys.init();
     s->needed_reg.init();
     table_vector[i]=s->table=table=tables->table;
-    table->file->info(HA_STATUS_VARIABLE | HA_STATUS_NO_LOCK);// record count
+    error= table->file->info(HA_STATUS_VARIABLE | HA_STATUS_NO_LOCK);
+    if(error)
+    {
+        table->file->print_error(error, MYF(0));
+        DBUG_RETURN(1);
+    }
     table->quick_keys.clear_all();
     table->reginfo.join_tab=s;
     table->reginfo.not_exists_optimize=0;

sql/sql_union.cc

@@ -492,7 +492,12 @@ int st_select_lex_unit::exec()
 	DBUG_RETURN(res);
       }
       /* Needed for the following test and for records_at_start in next loop */
-      table->file->info(HA_STATUS_VARIABLE);
+      int error= table->file->info(HA_STATUS_VARIABLE);
+      if(error)
+      {
+        table->file->print_error(error, MYF(0));
+        DBUG_RETURN(1);
+      }
       if (found_rows_for_union && !sl->braces && 
           select_limit_cnt != HA_POS_ERROR)
       {