Bug #46607: Assertion failed: (cond_type == Item::FUNC_ITEM)

            results in server crash 
 
check_group_min_max_predicates() assumed the input condition 
item to be one of COND_ITEM, SUBSELECT_ITEM, or FUNC_ITEM. 
Since a condition of the form "field" is also a valid condition 
equivalent to "field <> 0", using such a condition in a query 
where the loose index scan was chosen resulted in a debug 
assertion failure. 
 
Fixed by handling conditions of the FIELD_ITEM type in 
check_group_min_max_predicates(). 

1 files changed, 11 insertions, 1 deletions

diff --git a/sql/opt_range.cc b/sql/opt_range.cc
index e3aef02637f..d7438b7b9cc 100644
--- a/sql/opt_range.cc
+++ b/sql/opt_range.cc
@@ -9628,7 +9628,17 @@ check_group_min_max_predicates(COND *cond, Item_field *min_max_arg_item,
   */
   if (cond_type == Item::SUBSELECT_ITEM)
     DBUG_RETURN(FALSE);
-  
+
+  /*
+    Condition of the form 'field' is equivalent to 'field <> 0' and thus
+    satisfies the SA3 condition.
+  */
+  if (cond_type == Item::FIELD_ITEM)
+  {
+    DBUG_PRINT("info", ("Analyzing: %s", cond->full_name()));
+    DBUG_RETURN(TRUE);
+  }
+
   /* We presume that at this point there are no other Items than functions. */
   DBUG_ASSERT(cond_type == Item::FUNC_ITEM);