Id column in EXPLAIN can be null.

957b5590 · Sergei Golubchik · 76f0b94b · 957b5590
Commit 957b5590 authored Oct 19, 2011 by Sergei Golubchik
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sql/sql_class.cc sql/sql_class.cc +2 -1

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--- a/sql/sql_class.cc
+++ b/sql/sql_class.cc
@@ -2004,7 +2004,8 @@ int THD::send_explain_fields(select_result *result)
  List<Item> field_list;
  Item *item;
  CHARSET_INFO *cs= system_charset_info;
-  field_list.push_back(new Item_return_int("id",3, MYSQL_TYPE_LONGLONG));
+  field_list.push_back(item= new Item_return_int("id",3, MYSQL_TYPE_LONGLONG));
+  item->maybe_null= 1;
  field_list.push_back(new Item_empty_string("select_type", 19, cs));
  field_list.push_back(item= new Item_empty_string("table", NAME_CHAR_LEN, cs));
  item->maybe_null= 1;