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:
  update for handler::info() now returning int
sql/ha_blackhole.h:
  update for handler::info() now returning int
sql/ha_isam.cc:
  update for handler::info() now returning int
sql/ha_isam.h:
  update for handler::info() now returning int
sql/ha_isammrg.cc:
  update for handler::info() now returning int
sql/ha_isammrg.h:
  update for handler::info() now returning int
sql/item_sum.cc:
  update for handler::info() now returning int.
  
  return error to user if info call fails
sql/sql_delete.cc:
  update for handler::info() now returning int.
  
  return error to user if info call fails
sql/sql_select.cc:
  update for handler::info() now returning int.
  
  return error to user if info call fails
sql/sql_union.cc:
  update for handler::info() now returning int.
  
  return error to user if info call fails

1 files changed, 6 insertions, 1 deletions

diff --git a/sql/sql_union.cc b/sql/sql_union.cc
index 0948602bbb4..f3f814831f5 100644
--- a/sql/sql_union.cc
+++ b/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)
       {