Fixed bug #32403: query causes a crash due to stack and

                  memory corruptions.

The right pointer field of the SEL_ARG structure was not
initialized in the constructor and sometimes that led to
server crashes.

There is no testcase because the bug occurs only when
uninitialized memory has particular values, which can't be
re-created in the test suite.

sql/opt_range.cc

@@ -250,6 +250,9 @@ public:
   Field *field;
   char *min_value,*max_value;			// Pointer to range
 
+  /*
+    eq_tree() requires that left == right == 0 if the type is MAYBE_KEY.
+   */
   SEL_ARG *left,*right;   /* R-B tree children */
   SEL_ARG *next,*prev;    /* Links for bi-directional interval list */
   SEL_ARG *parent;        /* R-B tree parent */
@@ -265,7 +268,7 @@ public:
   SEL_ARG(Field *field, uint8 part, char *min_value, char *max_value,
 	  uint8 min_flag, uint8 max_flag, uint8 maybe_flag);
   SEL_ARG(enum Type type_arg)
-    :min_flag(0),elements(1),use_count(1),left(0),next_key_part(0),
+    :min_flag(0),elements(1),use_count(1),left(0),right(0),next_key_part(0),
     color(BLACK), type(type_arg)
   {}
   inline bool is_same(SEL_ARG *arg)