Merge mysql.com:/home/psergey/mysql-5.0-bug30324

into  mysql.com:/home/psergey/mysql-5.1-bug27927


mysql-test/r/type_bit.result:
  Auto merged
mysql-test/t/type_bit.test:
  Auto merged
sql/item_sum.cc:
  Auto merged

1 files changed, 17 insertions, 0 deletions

diff --git a/sql/item_sum.cc b/sql/item_sum.cc
index 8fe843a2a2d..2684cce16ac 100644
--- a/sql/item_sum.cc
+++ b/sql/item_sum.cc
@@ -2483,6 +2483,23 @@ bool Item_sum_count_distinct::setup(THD *thd)
   count_field_types(select_lex, tmp_table_param, list, 0);
   tmp_table_param->force_copy_fields= force_copy_fields;
   DBUG_ASSERT(table == 0);
+  /*
+    Make create_tmp_table() convert BIT columns to BIGINT.
+    This is needed because BIT fields store parts of their data in table's
+    null bits, and we don't have methods to compare two table records, which
+    is needed by Unique which is used when HEAP table is used.
+  */
+  {
+    List_iterator_fast<Item> li(list);
+    Item *item;
+    while ((item= li++))
+    {
+      if (item->type() == Item::FIELD_ITEM &&
+          ((Item_field*)item)->field->type() == FIELD_TYPE_BIT)
+        item->marker=4;
+    }
+  }
+
   if (!(table= create_tmp_table(thd, tmp_table_param, list, (ORDER*) 0, 1,
 				0,
 				(select_lex->options | thd->options),