MDEV-13694: Wrong result upon GROUP BY with orderby_uses_equalities=on

For the case when  the SJM scan table is the first table in the join order,
then if we want to do the sorting on the SJM scan table, then we need to
make sure that we unpack the values to base table fields in two cases:
    1) Reading the SJM table and writing the sort-keys inside the sort-buffer
    2) Reading the sorted data from the sort file

1 files changed, 1 insertions, 0 deletions

diff --git a/sql/records.h b/sql/records.h
index 04dc06b3c74..852312530db 100644
--- a/sql/records.h
+++ b/sql/records.h
@@ -55,6 +55,7 @@ struct READ_RECORD
   TABLE *table;                                 /* Head-form */
   Unlock_row_func unlock_row;
   Read_func read_record_func;
+  Read_func read_record_func_and_unpack_calls;
   THD *thd;
   SQL_SELECT *select;
   uint ref_length, reclength, rec_cache_size, error_offset;