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-rw-r--r--sql/sql_select.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index 720226033e6..db95214cfa3 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -3635,7 +3635,7 @@ create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
in the first 'hidden_null_pack_length' bytes of the row.
*/
null_pack_length-=hidden_null_pack_length;
- keyinfo->key_parts= ((field_count-hidden_field_count)+
+ keyinfo->key_parts= ((field_count-param->hidden_field_count)+
test(null_pack_length));
if (allow_distinct_limit)
{