Bug#34529: Crash on complex Falcon I_S select after ALTER .. PARTITION BY

  
When swapping out heap I_S tables to disk, this is done after plan refinement.
Thus, READ_RECORD::file will still point to the (deleted) heap handler at start
of execution. This causes segmentation fault if join buffering is used and the 
query is a star query where the result is found to be empty before accessing
some table. In this case that table has not been initialized (i.e. had its 
READ_RECORD re-initialized) before the cleanup routine tries to close the handler.
Fixed by updating READ_RECORD::file when changing handler.

1 files changed, 2 insertions, 0 deletions

diff --git a/sql/sql_show.cc b/sql/sql_show.cc
index 36d154181f8..a80319785bd 100644
--- a/sql/sql_show.cc
+++ b/sql/sql_show.cc
@@ -4073,9 +4073,11 @@ bool get_schema_tables_result(JOIN *join,
       {
         result= 1;
         join->error= 1;
+        tab->read_record.file= table_list->table->file;
         table_list->schema_table_state= executed_place;
         break;
       }
+      tab->read_record.file= table_list->table->file;
       table_list->schema_table_state= executed_place;
     }
   }